Consulta: subjectFacets:"Population structure"
Registros recuperados: 160
Data/hora: 05/06/2024 12:52:55

Estructura poblacional de aislamiento del Citrus Tristeza Closterovirus (CTV) en México y en Brasil
Provedor de dados: 32
Autores: Rivas Valencia, Patricia.
La tristeza es causada por un complejo viral constituido por diversos  haplotipos (hps) del Citrus tristeza virus (CTV). El objetivo fue  realizar un análisis de la estructura poblacional en diferentes  escenarios epidémicos: a) En Yucatán, México, en condiciones  asintomáticas (As) y con presencia de T. citricida (Tc), vector asociado  a aislamientos de tipo severo; y en Tamaulipas en condiciones As y sin  Tc. b) En Brasil, en condiciones As y sintomáticas (s), en regiones con y  sin muerte súbita de los cítricos (MSC), síndrome atribuible a una nueva  variante severa del CTV. Se estudiaron las secuencias génicas p25 y p27  de la capa proteica viral. En México, con SSCP se demostró una estructura  poblacional compleja en Tamaulipas, con 7 patrones...
Tipo: Tesis
Palavras-chave: SSCP; Muerte súbita de los cítricos; Estructura poblacional; Doctorado; Fitopatología; Citrus sudden death; Population structure.
Ano: 2008
URL: http://hdl.handle.net/10521/1368

Estructura poblacional de aislamiento del Citrus Tristeza Closterovirus (CTV) en México y en Brasil
Provedor de dados: 32
Autores: Rivas Valencia, Patricia.
RESUMEN  La tristeza es causada por un complejo viral constituido por diversos  haplotipos (hps) del Citrus tristeza virus (CTV). El objetivo fue  realizar un análisis de la estructura poblacional en diferentes  escenarios epidémicos: a) En Yucatán, México, en condiciones  asintomáticas (As) y con presencia de T. citricida (Tc), vector asociado  a aislamientos de tipo severo; y en Tamaulipas en condiciones As y sin  Tc. b) En Brasil, en condiciones As y sintomáticas (s), en regiones con y  sin muerte súbita de los cítricos (MSC), síndrome atribuible a una nueva  variante severa del CTV. Se estudiaron las secuencias génicas p25 y p27  de la capa proteica viral. En México, con SSCP se demostró una estructura  poblacional compleja en Tamaulipas, con 7...
Tipo: Tesis
Palavras-chave: SSCP; Muerte súbita de los cítricos; Estructura poblacional SSCP; Citrus sudden death; Population structure.
Ano: 2012
URL: http://hdl.handle.net/10521/1061

Estructura morfológica-poblacional de Hintonia latiflora (Rubiaceae) relacionada con el descortezamiento, en la Cuenca Alta del Balsas México.
Provedor de dados: 32
Autores: Beltrán Rodríguez, Leonardo Alejandro.
Hintonia latiflora “quina amarilla” habita en el Bosque Tropical Caducifolio, es medicinal por lo que se comercializa la corteza interna. La recolecta es excesiva y las poblaciones están cada vez más distantes y escasas. No se cuenta con información biológica, ecológica y social que permita establecer criterios para la gestión y conservación de la especie, por ello, el presente estudio se desarrolló en Tlalcozotitlán, Guerrero, el sitio de cosecha comercial de quina. Se documentó la historia natural y antropógena de H. latiflora sustentada en la literatura científica y en observaciones de campo; se investigó la estructura poblacional, la influencia de la cosecha de corteza sobre caracteres arquitectónicos,  reproductivos y en la densidad, además, se...
Palavras-chave: Quina amarilla; Historia natural; Factores físicos; Estructura poblacional; Corteza medicinal; Gestión comunitaria; Yellow quina; Natural history; Physical factors; Population structure; Medicinal bark; Community management; Botánica; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2183

&amp;#321;egha&amp;#769;gots'enete&amp;#808; (learning together): the importance of indigenous perspectives in the identification of biological variation
Provedor de dados: 7
Autores: Polfus, Jean L.; Natural Resources Institute, University of Manitoba, Winnipeg, Manitoba, Canada; jeanpolfus@gmail.com; Manseau, Micheline; Office of the Chief Ecosystem Scientist, Parks Canada, Gatineau, Qu&amp;#233;bec, Canada; Natural Resources Institute, University of Manitoba, Winnipeg, Manitoba, Canada; Micheline.Manseau@pc.gc.ca; Bayha, Walter; De&amp;#769;l&amp;#305;&amp;#808;ne&amp;#808; Land Corporation, De&amp;#769;l&amp;#305;&amp;#808;ne&amp;#808;, Northwest Territories, Canada; nihtla321@gmail.com; Rice, Keren; Department of Linguistics, University of Toronto, Toronto, Ontario, Canada; rice@chass.utoronto.ca; Wilson, Paul; Biology Department, Trent University, Peterborough, Ontario, Canada; pawilson@trentu.ca.
Tipo: Peer-Reviewed Reports
Palavras-chave: Aboriginal; Biocultural diversity; Biodiversity; Caribou; Collaborative research; Ecology; First Nation; Genetic variation; Indigenous communities; Population genetics; Population structure; Rangifer tarandus; Resource management; Social-ecological systems; Traditional knowledge.
Ano: 2016

Evaluation of genetic diversity and linkage disequilibrium in Korean-bred rice varieties using SSR markers
Provedor de dados: 69
Autores: Wang,Xiao-Qiang; Kwon,Soon-Wook; Park,Yong-Jin.
Background: In order to evaluate the variation among different rice types, the genetic diversity in a rice collection composed by 59 breeding lines, 23 landraces, 18 weedy rice lines, and 35 introduced lines that collected from countries worldwide was analyzed using 134 simple sequence repeat markers. Results: In total, 1264 alleles were identified (average, 9.43 per locus). Rare alleles made up a large portion (58.4%) of the detected alleles, and 29 unique alleles associated with rice accessions were also discovered. A model-based structural analysis revealed the presence of three subpopulations. The genetic relationships revealed by the neighbour-joining tree method were fairly consistent with the structure-based membership assignments for most of the...
Tipo: Journal article
Palavras-chave: Landraces; Linkage disequilibrium; Population structure; Rice; Simple sequence repeats.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500011

Genetic diversity and population structure analysis of strawberry (Fragaria x ananassa Duch.) using SSR markers
Provedor de dados: 69
Autores: Yoon,Min-Young; Moe,Kyaw Thu; Kim,Dae-Young; Rho,Il-Rae; Kim,Su; Kim,Ki-Taek; Won,Mi-Kyoung; Chung,Jong-Wook; Park,Yong-Jin.
In total, 18 simple sequence repeat (SSR) markers were used to analyze the genetic diversity and population structure of 59 accessions of cultivated strawberry (Fragaria x ananassa Duch.) from Korea, Germany, United States, United Kingdom, and Japan. In total, 101 alleles were detected with an average of 5.6 per locus and 21 specific alleles were identified. Notably, one genotype (Blonoli from Germany) possessed a maximum of 10 different unique alleles specific to each genotype. The gene diversity varied from 0.027 (EMPaEKO1B) to 0.791 (CFACT110), with an average value of 0.509. PIC values ranged from 0.026 to 0.762 (average 0.454). A model-based structure analysis revealed the presence of two populations. The accessions that were clearly assigned to a...
Tipo: Journal article
Palavras-chave: Genetic diversity; Population structure; SSR markers; Strawberry.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000200006

Genetic diversity of Morato's Digger Toad, Proceratophrys moratoi: spatial structure, gene flow, effective size and the need for differential management strategies of populations
Provedor de dados: 74
Autores: Arruda,Mauricio P.; Costa,William P.; Recco-Pimentel,Shirlei M.
Abstract The Morato's Digger Toad, Proceratophrys moratoi, is a critically endangered toad species with a marked population decline in southern Brazilian Cerrado. Despite this, new populations are being discovered, primarily in the northern part of the distribution range, which raises a number of questions with regard to the conservation status of the species. The present study analyzed the genetic diversity of the species based on microsatellite markers. Our findings permitted the identification of two distinct management units. We found profound genetic structuring between the southern populations, on the left margin of the Tietê River, and all other populations. A marked reduction was observed in the contemporary gene flow among the central populations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Proceratophrys moratoi; Microsatellite; Population structure; Management unit; Conservation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000300502

Genetics, evolution and conservation of Bromeliaceae
Provedor de dados: 74
Autores: Zanella,Camila M.; Janke,Aline; Palma-Silva,Clarisse; Kaltchuk-Santos,Eliane; Pinheiro,Felipe G.; Paggi,Gecele M.; Soares,Luis E.S.; Goetze,Márcia; Büttow,Miriam V.; Bered,Fernanda.
Bromeliaceae is a morphologically distinctive and ecologically diverse family originating in the New World. Three centers of diversity, 58 genera, and about 3,140 bromeliad species are currently recognized. We compiled all of the studies related to the reproductive biology, genetic diversity, and population structure of the Bromeliaceae, and discuss the evolution and conservation of this family. Bromeliads are preferentially pollinated by vertebrates and show marked variation in breeding systems, from predominant inbreeding to predominant outcrossing, as well as constancy in chromosome number (2n = 2x = 50). Autogamous or mixed mating system bromeliads have a high inbreeding coefficient (F IS), while outcrossing species show low F IS. The degree of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bromeliads; Cytogenetics; Genetic diversity; Population structure; Reproductive biology.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000600017

Genetic diversity and population structure of the Guinea pig (Cavia porcellus, Rodentia, caviidae) in Colombia
Provedor de dados: 74
Autores: Burgos-Paz,William; Cerón-Muñoz,Mario; Solarte-Portilla,Carlos.
The aim was to establish the genetic diversity and population structure of three guinea pig lines, from seven production zones located in Nariño, southwest Colombia. A total of 384 individuals were genotyped with six microsatellite markers. The measurement of intrapopulation diversity revealed allelic richness ranging from 3.0 to 6.56, and observed heterozygosity (Ho) from 0.33 to 0.60, with a deficit in heterozygous individuals. Although statistically significant (p &lt; 0.05), genetic differentiation between population pairs was found to be low. Genetic distance, as well as clustering of guinea-pig lines and populations, coincided with the historical and geographical distribution of the populations. Likewise, high genetic identity between improved and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food security; Microsatellite; Population structure.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000400027

Genetic variability of two populations of Pseudoplatystoma reticulatum from the Upper Paraguay River Basin
Provedor de dados: 74
Autores: Abreu,Marcia Matos de; Pereira,Luiz Henrique Garcia; Vila,Vilma Barretto; Foresti,Fausto; Oliveira,Claudio.
Catfishes of the genus Pseudoplatystoma are very important species due to both their high commercial value and their ecological role as voracious predators. They undertake lengthy migratory movements during their life-cycle, this including reproductive migration which occurs from October to December in the rainy season. In the present study, seven microsatellite loci were analyzed to access genetic variability in two samples of P. reticulatum from the Upper Paraguay Basin. The loci were highly polymorphic (mean = 7.28). According to all analysis, the two samples of P. reticulatum revealed pronounced genetic differentiation. Fst value was 0.2290, Rst value 0.1067 and AMOVA 22.90% (Fst) and 10.67% (Rst), all being highly significant (p &lt; 0.001). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Population genetics; Microsatellite; Homing; Population structure.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000400032

Interethnic admixture and the evolution of Latin American populations
Provedor de dados: 74
Autores: Salzano,Francisco Mauro; Sans,Mónica.
A general introduction to the origins and history of Latin American populations is followed by a systematic review of the data from molecular autosomal assessments of the ethnic/continental (European, African, Amerindian) ancestries for 24 Latin American countries or territories. The data surveyed are of varying quality but provide a general picture of the present constitution of these populations. A brief discussion about the applications of these results (admixture mapping) is also provided. Latin American populations can be viewed as natural experiments for the investigation of unique anthropological and epidemiological issues.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interethnic admixture; Latin America; Population structure.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000200003

Mitochondrial DNA phylogeography of Brazilian populations of Drosophila buzzatii
Provedor de dados: 74
Autores: Brito,Reinaldo A. de; Manfrin,Maura H.; Sene,Fabio M.
The Argentinean Chaco region has been considered the center of origin of Drosophila buzzatii in South America because it contains most of the chromosomal polymorphism detected in natural populations. Two hypotheses have been put forward to explain the distribution of D. buzzatii in Brazil, one proposing that it has only recently passively colonized Brazil via human dispersal and the other suggesting that D. buzzatii has actively migrated to Brazil some time ago. Data from chromosomal inversions support recent colonization, whereas data from allozymes and mtDNA variation indicate that D. buzzatii has been in Brazil longer, favoring an active dispersal hypothesis. In our present work we analyzed data on 56 South American flies, mostly from Brazil, sequenced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drosophila buzzatii; Population structure; Mitochondrial DNA; Phylogeography; Brazil; Climatic cycles.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000200009

Variation and genetic structure of Melipona quadrifasciata Lepeletier (Hymenoptera, Apidae) populations based on ISSR pattern
Provedor de dados: 74
Autores: Nascimento,Marcília A.; Batalha-Filho,Henrique; Waldschmidt,Ana M.; Tavares,Mara G.; Campos,Lucio A.O.; Salomão,Tânia M.F.
For a study of diversity and genetic structuring in Melipona quadrifasciata, 61 colonies were collected in eight locations in the state of Minas Gerais, Brazil. By means of PCR analysis, 119 ISSR bands were obtained, 80 (68%) being polymorphic. He and H B were 0.20 and 0.16, respectively. Two large groups were obtained by the UPGMA method, one formed by individuals from Januária, Urucuia, Rio Vermelho and Caeté and the other by individuals from São João Del Rei, Barbacena, Ressaquinha and Cristiano Otoni. The Φst and θB values were 0.65 and 0.58, respectively, thereby indicating high population structuring. UPGMA grouping did not reveal genetic structuring of M. quadrifasciata in function of the tergite stripe pattern. The significant correlation between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hymenoptera; Melipona; Genetic differentiation; ISSR markers; Population structure.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200031

Population structure analysis of Pimelodus maculatus (Pisces, Siluriformes) from the Tietê and Paranapanema Rivers (Brazil)
Provedor de dados: 74
Autores: Almeida,Fernanda Simões de; Sodré,Leda Maria Koelblinger; Contel,Eucleia Primo Betioli.
Pimelodus maculatus populations from the Tietê and Paranapanema rivers were sampled and had their genetic structure analyzed by using RAPD markers, with the aim of contributing to future conservation studies. The proportion of polymorphic loci was greater than 50% in the populations of both rivers. Genetic diversity data showed that, in spite of its nine hydroelectric plants, the Tietê river population was genetically homogeneous, whereas the Paranapanema river population was structured. This might be due to the presence of high waterfalls distributed all along its course. These data may serve as indicators for future conservation studies on the Tietê and Paranapanema rivers.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RAPD markers; Population structure; Conservation; Genetic variability; Pimelodus.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000300014

High interpopulation homogeneity in Central Argentina as assessed by Ancestry Informative Markers (AIMs)
Provedor de dados: 74
Autores: García,Angelina; Dermarchi,Darío A.; Tovo-Rodrigues,Luciana; Pauro,Maia; Callegari-Jacques,Sidia M.; Salzano,Francisco M.; Hutz,Mara H.
The population of Argentina has already been studied with regard to several genetic markers, but much more data are needed for the appropriate definition of its genetic profile. This study aimed at investigating the admixture patterns and genetic structure in Central Argentina, using biparental markers and comparing the results with those previously obtained by us with mitochondrial DNA (mtDNA) in the same samples. A total of 521 healthy unrelated individuals living in 13 villages of the Córdoba and San Luis provinces were tested. The individuals were genotyped for ten autosomal ancestry informative markers (AIMs). Allele frequencies were compared with those of African, European and Native American populations, chosen to represent parental contributions....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AIMs; Córdoba; San Luis; Migration; Population structure.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572015000300324

Population structure and genetic diversity of the giant anteater (Myrmecophaga tridactyla: Myrmecophagidae, Pilosa) in Brazil
Provedor de dados: 74
Autores: Clozato,Camila L.; Miranda,Flávia R.; Lara-Ruiz,Paula; Collevatti,Rosane G.; Santos,Fabrício R.
Abstract The giant anteater (Myrmecophaga tridactyla, Pilosa, Linnaeus 1758) belongs to the mammalian order Pilosa and presents a large distribution along South America, occupying a great variety of habitats. It is listed in the IUCN Red List of threatened species as Vulnerable. Despite threatened, there is a lack of studies regarding its genetic variability. The aim of this study was to examine the genetic diversity and patterns of genetic structure within remaining populations. We analyzed 77 individuals from seven different populations distributed in four biomes across Brazil: Cerrado, Pantanal, Atlantic Forest and Amazon Forest. We sequenced two mitochondrial markers (control region and Cyt-b) and two nuclear markers (AMELY and RAG2). We found high...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Giant Anteater; Xenarthra; Cerrado; Genetic diversity; Population structure.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000100050

Linkage disequilibrium, genetic association mapping and gene localization in crop plants
Provedor de dados: 74
Autores: Sorkheh,Karim; Malysheva-Otto,Lyudmyla V.; Wirthensohn,Michelle G.; Tarkesh-Esfahani,Saeed; Martínez-Gómez,Pedro.
DNA-based molecular markers have been extensively utilized for a variety of studies in both plant and animal systems. One of the major uses of these markers is the construction of genome-wide molecular maps and the genetic analysis of simple and complex traits. However, these studies are generally based on linkage analysis in mapping populations, thus placing serious limitations in using molecular markers for genetic analysis in a variety of plant populations. Therefore, alternative approach has been suggested, linkage disequilibrium-based association analysis which detects and locates quantitative trait loci (QTL) by the strength of the correlation between a trait and a marker. Although association analysis has already been used for studies on genetics of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Linkage disequilibrium; LD; Association mapping; Population structure; QTLs; Localization of genes; Marker-trait associations.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000500001

Population structure of Eupemphix nattereri (Amphibia, Anura, Leiuperidae) from Central Brazil
Provedor de dados: 74
Autores: Silva,Daniela de Melo e; Cruz,Aparecido Divino da; Bastos,Rogério Pereira; Reis,Raquel Loren; Telles,Mariana Pires de Campos; Diniz-Filho,José Alexandre Felizola.
This study reports on 156 specimens of the amphibian Eupemphix nattereri, a widely distributed leiuperid, obtained from 11 municipalities of central Brazil. The extent of genetic variation was quantified by determining the mean number of alleles per locus and the proportion of polymorphic loci. An analysis of molecular variance (AMOVA) was performed on the random amplified polymorphic DNA (RAPD) haplotypes. The genetic distances obtained by calculating pairwise phist among local samples were used to determine population relationships using the unweighted pair-group method (UPGMA) and non-metric multidimensional scaling (NMDS). The cophenetic correlation was calculated to confirm agreement between the genetic matrix and the unweighted pair group method with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eupemphix nattereri; Gene flow; Population structure; RAPD markers.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000600022

Factorial analysis of bootstrap variances of population genetic parameter estimates
Provedor de dados: 74
Autores: Carlini-Garcia,Luciana Aparecida; Vencovsky,Roland; Coelho,Alexandre Siqueira Guedes.
We presented an alternative way to verify the relative contribution to the total variance, of the sources of variation due to populations (P), individuals within populations (I), the (P*I) interaction, and the standard error of the following parameter estimates: total (F) and intrapopulation (f) fixation indices, and divergence among populations (q). The knowledge of this relative contribution is important to establish sampling strategies of natural populations. To attain these objectives, the bootstrap method was used to resample simultaneously populations and individuals, considering different combinations of P and I. This procedure was repeated five times for a given combination of each analyzed data set. For each data set, five estimates of these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population structure; Resampling; Natural populations.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000200019

Optimization procedures for establishing reserve networks for biodiversity conservation taking into account population genetic structure
Provedor de dados: 74
Autores: Diniz Filho,José Alexandre Felizola; Telles,Mariana Pires de Campos.
Conservation genetics has been focused on the ecological and evolutionary persistence of targets (species or other intraspecific units), especially when dealing with narrow-ranged species, and no generalized solution regarding the problem of where to concentrate conservation efforts for multiple genetic targets has yet been achieved. Broadly distributed and abundant species allow the identification of evolutionary significant units, management units, phylogeographical units or other spatial patterns in genetic variability, including those generated by effects of habitat fragmentation caused by human activities. However, these genetic units are rarely considered as priority conservation targets in regional conservation planning procedures. In this paper, we...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity conservation; Population structure; Geographic genetics.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000200004

Genetic structure of the snakehead murrel, Channa striata (channidae) based on the cytochrome c oxidase subunit I gene: influence of historical and geomorphological factors
Provedor de dados: 74
Autores: Jamaluddin,Jamsari Amirul Firdaus; Pau,Tan Min; Siti-Azizah,Mohd Nor.
Nucleotide sequences of a partial cytochrome c oxidase subunit I gene were used to assess the manner in which historical processes and geomorphological effects may have influenced genetic structuring and phylogeographic patterns in Channa striata. Assaying was based on individuals from twelve populations in four river systems, which were separated into two regions, the eastern and western, of the biodiversely rich state of Perak in central Peninsular Malaysia. In 238 specimens, a total of 368-bp sequences with ten polymorphic sites and eleven unique haplotypes were detected. Data on all the twelve populations revealed incomplete divergence due to past historical coalescence and the short period of separation. Nevertheless, SAMOVA and F ST revealed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Channa striata; MtDNA COI; Phylogeography; Population structure.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000100026

Intraspecific variation and population structure of the Velvetbean Caterpillar, Anticarsia gemmatalis Hübner, 1818 (Insecta: Lepidoptera: Noctuidae)
Provedor de dados: 74
Autores: Sosa-Gómez,Daniel R.
The velvetbean caterpillar (VBC), Anticarsia gemmatalis Hübner, 1818 (Insecta: Lepidoptera: Noctuidae), is one of the most important New World soybean agro-ecosystems pests, occurring from 40° N in the USA to 39° S in Argentina. Information on the migration patterns of the VBC moth may be important for managing the resistance of VBC populations to insecticides or plants carrying the Bacillus thuringiensis insecticide genes, especially since sedentary populations have a higher potential to became resistant than migratory populations. We studied intraspecific variations of geographically distinct VBC populations in order to determine the genetic distance between them and to assess the variability of VBC populations from near the city of Londrina (Paraná (PR)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Molecular marker; RAPD; Gene flow; Soybean pest; Population structure.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000300012

Phylogeographic history of South American populations of the silky anteater Cyclopes didactylus (Pilosa: Cyclopedidae)
Provedor de dados: 74
Autores: Coimbra,Raphael Teodoro Franciscani; Miranda,Flávia Regina; Lara,Camila Clozato; Schetino,Marco Antônio Alves; Santos,Fabrício Rodrigues dos.
Abstract Cyclopes didactylus, commonly called silky anteater, is the smallest and least studied of the anteaters. It is an arboreal species occurring in rainforests, ranging from southern Mexico to Central and South America, with an apparently disjoint distribution between Amazon and Atlantic rainforests in Brazil. Although seven subspecies are recognized, little is known about its geographical variation. Thus, to evaluate the population dynamics and evolutionary history of the South American silky anteater, we analyzed 1542 bp sequences of the mitochondrial control region (CR), COI and Cyt-b genes of 32 individuals. Haplotype network, AMOVA and molecular dating analyses were performed and identified seven geographic clusters. The split of lineages...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Xenarthra; Mitochondrial DNA; Population structure; Molecular dating; South America.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000100040

Сезонная динамика численности и размерно-возрастного состава гемипопуляции марит Helicometra fasciata (Rud., 1819) в прибрежной зоне юго-западного Крыма.
Provedor de dados: 13
Autores: Корнийчук, Ю. М.
Установлено, что парагемипопуляция марит Helicometra fasciata в руленах Symphodus tinca испытывает на протяжении года незначительные флуктуации численности, что обусловлено длительным (примерно год) сроком жизни марит в сочетании с круглогодичным поступлением ювенильных паразитов в популяцию хозяина. Такая схема динамики численности обеспечивает относительную независимость паразитарной системы H. fasciata от межгодовых колебаний абиотических условий и, следовательно, ее устойчивость.
Tipo: Journal Contribution
Palavras-chave: Helicometra fasciata; Мариты; Численность; Размерно-возрастной состав; Чёрное море; Population structure; Seasonal changes; Symphodus tinca; Популяційна структура; Сезонні зміни.
Ano: 2008
URL: http://repository.ibss.org.ua/dspace/handle/99011/811

Популяционная структура и условия формирования промыслового запаса хамсы Engraulis encrasicolus у побережья Крыма в осенне-зимний сезон 200/2008 гг.
Provedor de dados: 13
Autores: Зуев, Г. В.; Гуцал, Д. К.; Репетин, Л. Н.; Салехова, Л. П.; Мельникова, Е. Б.; Бондарев, В. А.; Мурзин, Ю. Л.
С помощью индекса отолитов установлена принадлежность хамсы, зимовавшей в 2007/2008 гг. у юго-западного и южного побережья Крыма, к черноморской популяции. Проанализирована динамика размерно-возрастной и половой структуры популяции в период зимовки, а также динамика промысла. Обсуждаются гидрометеорологические факторы, обусловившие  массовую осеннюю миграцию хамсы к черноморскому побережью Крыма.
Tipo: Journal Contribution
Palavras-chave: Хамса; Улов; Запас; Популяционная структура; Отолит; Чёрное море; Anchovy; Catch; Stock; Population structure; Otolith; Black Sea; Популяційна структура; Отоліт; Чорне море.
Ano: 2009
URL: http://repository.ibss.org.ua/dspace/handle/99011/841

Мейобентосное население прибрежных наносов региона Севастополя  (Чёрное море)
Provedor de dados: 13
Autores: Гусева, Е. В.
Рассмотрены состав и численность мейобентосного сообщества прибрежных наносов на полигонах в акватории Севастополя в летние сезоны  2001 – 2003 гг. Качественно-количественные характеристики мейобентоса наносов урезной зоны б. Круглая в 2003 г. сопоставлены с таковыми в пробах донных осадках с глубин 1,5 – 2 м за этот же период.
Tipo: Journal Contribution
Palavras-chave: Meiobenthos; Population density; Population structure; Population structure; Meiobenthos; Population density; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_12481; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/582

Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae)
Provedor de dados: 76
Autores: Silva,Jersei N.; Oliveira,Guilherme de; Rocha,Sérgio S. da.
ABSTRACT We analyzed the microhabitat preferences of Macrobrachium jelskii (Miers, 1877) males and females inhabiting an urban water reservoir in Cruz das Almas, Bahia, Brazil. Prawns were collected monthly, from March 2015 to February 2016, in three microhabitats, using a sieve. Each microhabitat was dominated by one macrophyte species: Eleocharis sp. (M1), Cabomba sp. (M2), and Nymphaea sp. (M3). The prawns were measured (carapace length), and categorized as juvenile males, adult males, juvenile females, non-ovigerous adult females and ovigerous adult females. An analysis of variance (ANOVA) was used to compare the number and size of individuals. The sex ratio and frequency of ovigerous females in the three microhabitats were also calculated. The sex...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macrophyte; Population structure; Reproduction; Spatial distribution.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212019000100227

Morphometric and genetic differentiation among populations of Eupemphix nattereri (Amphibia, Anura, Leiuperidae) from central Brazil
Provedor de dados: 76
Autores: Silva,Daniela de M. e; Cruz,Aparecido D. da; Bastos,Rogério P.; Telles,Mariana P. de C.; Diniz-Filho,José Alexandre F.
To assess genetic structure and phenotypic diversity of Eupemphix nattereri Steindachner, 1863, morphometric and molecular analyses were carried out for nine populations from the State of Goiás. A total of 11 morphometric traits were evaluated and genetic information was estimated using RAPD markers. Genetic and phenotypic distances were determined as a function of geographical origin. Correlation among genetic, morphometric, micro, and macroenviromental were analyzed by the Mantel test. Genetic data indicated high levels of genetic diversity (Φst= 0.3) among the nine populations. Mantel tests did not reveal a significant positive correlation between genetic and geographical distances, indicating that locally geographical populations were not genetically...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eupemphix nattereri; Morphology; RAPD markers; Gene flow; Population structure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212008000400013

Ecology and natural history of Akodon lindberghi (Rodentia, Sigmodontinae) in southeastern Brazil
Provedor de dados: 76
Autores: Queirolo,Diego; Granzinolli,Marco A. M.
We studied the ecology and natural history of the globally threatened and poorly known Akodon lindberghi Hershkovitz, 1990 in Parque Nacional da Serra da Canastra (PNSC) and Juiz de Fora (JF), southeastern Brazil. From November 1998 to September 2001 a total of 131 individuals were captured in wire-cage live-traps and 52 by pitfalls traps. They were all marked and released at the site. The largest abundances were registered during the dry season, and most of the captures occurred in open habitats. The mean body mass of the two populations was significantly different (18.1 g at PNSC versus 13.1 g at JF; H = 46.2678, g.l.=2, p&lt;0.001). In PNSC, individuals were reproductively active from August to February, and juveniles were present from May to August....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Akodon lindberghi; Reproduction; Abundance; Body mass; Population structure.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212009000200011

Population dynamics of the pea crab Austinixa aidae (Brachyura, Pinnotheridae): a symbiotic of the ghost shrimp Callichirus major (Thalassinidea, Callianassidae) from the southwestern Atlantic
Provedor de dados: 76
Autores: Peiró,Douglas F; Mantelatto,Fernando L.
The Pinnotheridae family is one of the most diverse and complex groups of brachyuran crabs, many of them symbionts of a wide variety of invertebrates. The present study describes the population dynamics of the pea crab Austinixa aidae (Righi, 1967), a symbiont associated with the burrows of the ghost shrimp Callichirus major (Say, 1818). Individuals (n = 588) were collected bimonthly from May, 2005 to September, 2006 along a sandy beach in the southwestern Atlantic, state of São Paulo, Brazil. Our data indicated that the population demography of A. aidae was characterized by a bimodal size-frequency distribution (between 2.0 and 4.0 mm and between 8.0 and 9.0 mm CW) that remained similar throughout the study period. Sex ratio does not differ significantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population structure; Pinnotherids; Intertidal zone; Symbiosis; Brazil.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212011000100001

Population dynamic of Sesarma rectum (Crustacea, Brachyura, Sesarmidae) from a muddy flat under human impact, Paraty, Rio de Janeiro, Brazil
Provedor de dados: 76
Autores: Silva,Stella Maris Januário da; Hirose,Gustavo Luis; Negreiros-Fransozo,Maria Lucia.
A population of Sesarma rectum Randall, 1840 under the influence of human impact was studied. Monthly sampling (CPUE, two people during 30 min) took place from August/2001 to July/2002 at an impacted muddy flat in Paraty city, State of Rio de Janeiro (23º13'S, 44º42'W). At the laboratory, specimens were classified by sex and measured with a vernier caliper (0.01 mm). The size at the beginning of the sexual maturity was obtained by means of different techniques: in the case of males it was used the allometric procedure and the macroscopic analysis of gonads wile for females, the size of the smallest ovigerous female was also considered. The population structure was evaluated by means the analysis of the variations in the modes of the size frequency...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sexual maturity; Allometric growth; Population structure; Fecundity.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212007000200010

A HMM-based model to geolocate pelagic fish from high-resolution individual temperature and depth histories: European sea bass as a case study
Provedor de dados: 5
Autores: Woillez, Mathieu; Fablet, Ronan; Tran-thanh Ngo,; Lalire, Maxime; Lazure, Pascal; De Pontual, Helene.
Numerous methods have been developed to geolocate fish from data storage tags. Whereas demersal species have been tracked using tide-driven geolocation models, pelagic species which undertake extensive migrations have been mainly tracked using light-based models. Here, we present a new HMM-based model that infers pelagic fish positions from the sole use of high-resolution temperature and depth histories. A key contribution of our framework lies in model parameter inference (diffusion coefficient and noise parameters with respect to the reference geophysical fields—satellite SST and temperatures derived from the MARS3D hydrodynamic model), which improves model robustness. As a case study, we consider long time series of data storage tags (DSTs) deployed on...
Tipo: Text
Palavras-chave: Fish movement; Archival tagging; Migration; Population structure; Hidden Markov Model (HMM); State-space model.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00300/41097/40270.pdf

Dispersion larvaire et cycle de vie dans les environnements hydrothermaux profonds : le cas de Rimicaris exoculata et d'espèces proches
Provedor de dados: 5
Autores: Hernandez Avila, Ivan.
Deep-water hydrothermal vent host high-biomass communities based on chemoautotrophy supported by the metabolic activity of free-living and symbiotic bacteria associated to invertebrates, especially megafauna. Knowledge on the mechanisms of dispersal and the life cycle of vent species is essential to our understanding of the vent communities in terms of distribution, structure and temporal variation. In this study, I present some advances regarding the dispersal and life cycle of a dominant species of the Mid-Atlantic Ridge (MAR) vent ecosystems, the alvinocaridid shrimp Rimicaris exoculata, and other related species. The methodological approaches applied include morphological descriptions of larvae, analysis of population biology and reproduction, and...
Tipo: Text
Palavras-chave: Sources hydrothermales profondes; Cycle de vie; Structure de population; Symbiose; Crevettes Alvinocarididae; Deep-water hydrothermal vents; Life cycle; Population structure; Reproduction; Dispersal; Symbiosis; Speciation.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00498/60927/64321.pdf

La Baie de Seine: Peuplements et especes benthiques en regime perturbe
Provedor de dados: 5
Autores: Cabioch, L; Retiere, C.
The waters of the Seine River are polluted by urban, industrial and agricultural effluents. In addition direct industrial wastes inputs are emptied into the estuary. Within the limits of the Seine Bay program it was not possible to research pollution impacts on every estuarine ecosystem link; so only benthos have been studied. To take time response of organisms into account, the authors have defined indicators or quantitative evaluation of parameters, reflecting physiological state. They have studied population fluctuations caused by natural or man induced effects.
Tipo: Text
Palavras-chave: Hydrodynamics; Population dynamics; Population structure; Bioaccumulation; Pollution effects; Marine pollution; Ecosystem disturbance; Benthos.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1304.pdf

Performance of maximum likelihood mixture models to estimate nursery habitat contributions to fish stocks: a case study on sea bream Sparus aurata
Provedor de dados: 5
Autores: Niklitschek, Edwin J.; Darnaude, Audrey M.
Background: Mixture models (MM) can be used to describe mixed stocks considering three sets of parameters: the total number of contributing sources, their chemical baseline signatures and their mixing proportions. When all nursery sources have been previously identified and sampled for juvenile fish to produce baseline nursery-signatures, mixing proportions are the only unknown set of parameters to be estimated from the mixed-stock data. Otherwise, the number of sources, as well as some/all nursery-signatures may need to be also estimated from the mixed-stock data. Our goal was to assess bias and uncertainty in these MM parameters when estimated using unconditional maximum likelihood approaches (ML-MM), under several incomplete sampling and...
Tipo: Text
Palavras-chave: Otolith chemistry; Mixture models; Mixed stocks; Mixing proportions; Mixing models; Stock identification; Stock structure; Fish stocks; Population structure; Sparus aurata.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00625/73753/74388.pdf

Using neutral, selected, and hitchhiker loci to assess connectivity of marine populations in the genomic era
Provedor de dados: 5
Autores: Gagnaire, Pierre-alexandre; Broquet, Thomas; Aurelle, Didier; Viard, Frederique; Souissi, Ahmed; Bonhomme, Francois; Arnaud-haond, Sophie; Bierne, Nicolas.
Estimating the rate of exchange of individuals among populations is a central concern to evolutionary ecology and its applications to conservation and management. For instance, the efficiency of protected areas in sustaining locally endangered populations and ecosystems depends on reserve network connectivity. The population genetics theory offers a powerful framework for estimating dispersal distances and migration rates from molecular data. In the marine realm, however, decades of molecular studies have met limited success in inferring genetic connectivity, due to the frequent lack of spatial genetic structure in species exhibiting high fecundity and dispersal capabilities. This is especially true within biogeographic regions bounded by well-known...
Tipo: Text
Palavras-chave: Connectivity; Gene flow; Marine conservation; Population genomics; Population structure.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00275/38592/37120.pdf

Reproduction and growth of the deep-sea brittlestar ophiura-ljungmani (lyman)
Provedor de dados: 5
Autores: Tyler, Pa; Gage, Jd.
Reproductive biology and population dynamics of Ophiura Ijungmani were studied by measuring disk diameters and by examining oocyte size-frequencies and fecundity from a sequential seasonal series of large samples from a 2900 m deep Permanent Station in the Rockall Trough (Northeast Atlantic). Egg size (max. 90 !lm) and fecundity (up to 57000 eggs per individual) suggests indirect planktotrophic development, while a clear annual cycle in gametogenesis, with probably synchronous spawning in JanuaryFebruary, confirms a marked seasonality that is also seen as an annual, summertime set of postlarvae on to the bottom. Analysis of size structure of the population indicates annually discrete year classes with a maximum longevitv of around 10 years. lndividuals...
Tipo: Text
Palavras-chave: Ovocytes; Fécondité; Structure de la répartition des classes de tailles; Recrutement; Capacité de survie; Oocytes; Fecundity; Population structure; Recruitment; Survivorship.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/00323/43424/43087.pdf

Bathymetric distribution and growth rates of Eunicella verrucosa (Cnidaria: Gorgoniidae) populations along the Marseilles coast (France)
Provedor de dados: 5
Autores: Sartoretto, Stephane; Francour, Patrice.
Gorgonians are important organisms in the Mediterranean Sea, where they form rocky benthic communities. Four main species (3 Holaxonia and 1 Scleraxonia) are predominant in infra- and circalittoral communities of the northwestern Mediterranean basin. Other species, such as Eunicella verrucosa (Pallas, 1766), are more rarely encountered. The expansion to unusually shallow bathymetric levels has been noted in the region of Marseilles (France) (between 20 and 40 m depth). A ten-year monitoring of colonies was used to assess the growth rate according to age (size): from 3.33 cm year(-1) (height &lt;15 cm) to 0.62 cm year(-1) (height &gt;40 cm).
Tipo: Text
Palavras-chave: Eunicella verrucosa; Mediterranean Sea; Growth rate; Population structure.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00087/19859/17508.pdf

Reproductive biology of Alvinocarls muricola (Decapoda : Caridea : Alvinocarididae) from cold seeps in the Congo Basin
Provedor de dados: 5
Autores: Ramirez Llodra, Eva; Segonzac, Michel.
The caridean shrimp Alvinocaris niuricola has been observed forming high density populations over mussel beds on the giant pockmark cold seep site Regab in the Gulf of Guinea at 3150 m depth. Samples were collected using the ROV Victor 6000, a beam trawl and a TV grab from two sites. The specimens Were sexed and measured for population structure analysis. In one sample the sex ratio was 1:1, but the other sample had a sex ratio significantly biased towards females. The maximum size of females is larger than males. A sub-sample was used for gametogenesis and fecundity analysis. The oogenesis and spermatogenesis of A. muricola is characteristic of caridean shrimps. The oogonia proliferate from the germinal epithelium and develop into previtellogenic oocytes...
Tipo: Text
Palavras-chave: Reproduction biology; Oogenesis; Sex ratio; Population structure; Caridean shrimp.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2317.pdf

Assessment of sea bass (Dicentrarchus labrax, L.) stock delimitation in the Bay of Biscay and the English Channel based on mark-recapture and genetic data
Provedor de dados: 5
Autores: Fritsch, Manon; Morizur, Yvon; Lambert, E; Bonhomme, Francois; Guinand, B.
Sea bass (Dicentrarchus labrax) fisheries are becoming increasingly abundant along eastern Atlantic coastlines, especially in the ICES sub-areas IV, VII and VIII, but they are still not being managed by the European Union TAC (Total Allowed Catches) system. Scientific information about these sea bass stocks is limited, but the fishery is currently managed or modelled based upon these data, separated into the ICES divisions. Clearly, failure to manage satisfactorily the fishery may lead to a decline in stocks. We therefore investigated the structure of Atlantic sea bass populations at eight microsatellite loci in the Bay of Biscay and the English Channel and, additionally, at five selected loci in Ireland and Scotland. Genetic data showed no significant...
Tipo: Text
Palavras-chave: Population structure; Microsatellite loci; Tagging; Mark recapture; Dicentrarchus labrax.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2401.pdf

Echantillonnage des debarquements en criee pour l'etude des structures demographiques. Sources de variabilite et optimisation du plan de sondage
Provedor de dados: 5
Autores: Chevalier, Robert.
The author analyzed problems encountered in selecting a sampling design for estimating the age structures of landings. He studied the effects of various factors of variability on the optimal values of the sampling rates. The method used for this analysis could be employed to define an optimal sampling strategy to assess the age structures of landings from fish markets.
Tipo: Text
Palavras-chave: Statistical sampling; Fish; Population structure; Age composition; Landing statistics.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/publication-1772.pdf

Donnees nouvelles sur le germon Thunnus alalunga Bonnaterre 1788 dans le Nord-Est Atlantic. 2eme partie. Les populations de germons Thunnus alalunga dans le Nord-Est Atlantique.
Provedor de dados: 5
Autores: Aloncle, Henri; Delaporte, Francis.
In this, the 2nd part of a study of Thunnus alalunga in the north-east Atlantic, populations and migrations are considered. The term 'population' is defined. The utilization of H. fusca as a biological 'marker' is considered and tagging experiments are described. Modal classes are examined: summary analysis, detailed analysis of fisheries. Internal temps and regulation are studied. The types of watering are defined and described and a statistical analysis as a function of the watering is made. An attempt at synthesis is made: Azorian, standard. Migratory determinism is examined.
Tipo: Text
Palavras-chave: ANE; Thunnus alalunga; Population structure; Tagging; Migrations; Ecological distribution.
Ano: 1974
URL: http://archimer.ifremer.fr/doc/1974/publication-2043.pdf

Lessons from the past: investigating historical data from bluefin tuna fisheries
Provedor de dados: 5
Autores: Fromentin, Jean-marc.
In 1963, the leading fisheries targeting Atlantic bluefin tuna (Thunnus thynnus) in the Norwegian Sea and North Sea suddenly collapsed without any warning. Little is known about this collapse and several hypotheses have been put forward, such as changes in migratory routes, recruitment failure or eradication of a sub-population: all of these hypotheses could result from natural causes and/or from overfishing. To help explain this mysterious event, an original data set of the main bluefin tuna fisheries of the 20th century, including total catch and size composition of the catch, has been compiled and analysed. The results reveal a strong and unambiguous link between the Nordic purse seine and Spanish trap fisheries during the 1950s and 1960s. However, this...
Tipo: Text
Palavras-chave: Thunnus thynnus; Retrospective analysis; Population structure; Migration patterns; Fisheries collapse.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6425.pdf

Estimation des stocks de poisson des lagons de Nouvelle-Calédonie : 1 – Structure et stocks des communautés des poissons de récifs.
Provedor de dados: 5
Autores: Letourneur, Y; Kulbicki, M; Labrosse, Pierre.
Lagoon fish in New Caledonia are mainly caught by artisanal fisheries and subsistence fishing. Reef fish are the major component of this catch. The present study aimed at estimating these reef fish standing stocks and at finding the main factors influencing the distribution of these fish. Sampling of 904 stations was stratified according to three zones (north, east and west) and three reef types (barrier, intermediate and fringing). Fish communities exhibited strong heterogeneity in their distribution, showing higher biomass (maximum of 447 g.m(-2)) and total standing stock (43 000 tonnes) in the north zone than in the east and west zones. Similarly, observed patterns were dependent on reef types: higher biomass and total standing stock being observed on...
Tipo: Text
Palavras-chave: Poissons de récifs; Poissons démersaux commerciaux; Structure de population; Nouvelle-Calédonie; Océan Pacifique; Reef fish; Commercial demersal fish; Population structure; New Caledonia; SW Pacific Ocean.
Ano: 2000
URL: https://archimer.ifremer.fr/doc/00608/71968/70658.pdf

Otolith shape variation provides a marker of stock origin for north Atlantic bluefin tuna (Thunnus thynnus)
Provedor de dados: 5
Autores: Brophy, Deirdre; Haynes, Paula; Arrizabalaga, Haritz; Fraile, Igaratza; Fromentin, Jean-marc; Garibaldi, Fulvio; Katavic, Ivan; Tinti, Fausto; Karakulak, F. Saadet; Macias, David; Busawon, Dheeraj; Hanke, Alex; Kimoto, Ai; Sakai, Osamu; Deguara, Simeon; Abid, Nouredinne; Santos, Miguel Neves.
Two stocks of bluefin tuna (Thunnus thynnus) inhabit the north Atlantic; the western and eastern stocks spawn in the Gulf of Mexico and the Mediterranean Sea respectively. Trans-Atlantic movements occur outside spawning time whereas natal homing maintains stock structure. Commercial fisheries may exploit a mixed assemblage of both stocks. The incorporation of mixing rates into stock assessment is precluded by uncertainties surrounding stock discrimination. Otolith shape descriptors were used to characterise western and eastern stocks of Atlantic bluefin tuna in the present study and to estimate stock composition in catches of unknown origin. Otolith shape varied with length and between locations and years. Within a restricted size range (200-297-cm fork...
Tipo: Text
Palavras-chave: Elliptical Fourier analysis; Population structure; Stock mixture analysis.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00346/45745/45381.pdf

Atlantic bluefin tuna: population dynamics, ecology, fisheries and management
Provedor de dados: 5
Autores: Fromentin, Jean-marc; Powers, Joseph.
Both old and new information on the biology and ecology of Atlantic bluefin tuna have confronted scientists with research challenges: research needs to be connected to current stock-assessment and management issues. We review recent studies on habitat, migrations and population structure, stressing the importance of electronic tagging results in the modification of our perception of bluefin tuna population dynamics and behaviour. Additionally, we question, from both scientific and management perspectives, the usefulness of the classical stock concept and suggest other approaches, such as Clark's contingent and metapopulation theories. Current biological information confirms that a substantial amount of uncertainty still exists in the understanding of...
Tipo: Text
Palavras-chave: Tuna fisheries; Thunnus thynnus; Stock assessment and management; Population structure; Population dynamics; Atlantic bluefin tuna.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-797.pdf

Le ceteau Dicologoglossa cunetata (Moreau), sa biologie et sa peche dans le sud du golfe de Gasgogne.
Provedor de dados: 5
Autores: Forest, A.
This study deals with D.cuneata, a small soleid listed among the spp of NEAFC Recommendation 2 and exploited by the 'artisanal' trawlers in the South of the Bay of Biscay. The gonads/gutted fish wt ratio has been calculated throughout a yr, and shows that young Dicologoglossa are able to reproduce at age-group II. Spawning takes place during the 3rd quarter. Growth has been determined by otolith reading and length frequency analysis; Bertalanffy's and Gompertz's equations parameters have been studied, and attempts to estimate the instantaneous rate of total mortality have been made. The results are: male Z 3-5=0.74 and 0.83, female Z 3-5=0.96 and 1.35. Selectivity experiments carried out on board of R/V 'La Palagia' give a selection factor of 3.9. The...
Tipo: Text
Palavras-chave: Microchirus; Dicologoglossa cuneata; Population structure; Gear selectivity; Total mortality; Population characteristics; Fishing effort; Artisanal fishing; Reproductive organs; Growth; Fishery statistics.
Ano: 1975
URL: http://archimer.ifremer.fr/doc/1975/publication-2003.pdf

Comparison of methods for stock assessment of European hake Merluccius merluccius in the Gulf of Lions (Northwestern mediterranean)
Provedor de dados: 5
Autores: Aldebert, Yvonne; Recasens, Laura.
European hake Merluccius merluccius is the main commercial demersal species in the Gulf of Lions (Northwestern Mediterranean). This fish is exploited by French and Spanish trawler fleets and by small-scale fisheries using gillnets and longlines. Data on landings and the demography of catches by type of gear are now available for the period 1988-1991. The assessment of the hake stock was carried out using methods of virtual population analysis (VPA), or cohort analysis, based respectively on mean pseudocohorts and cohorts by age. The results of these VPA were then analysed and compared from a methodological point of view. The general results have confirmed previous studies with regard to the level of exploitation of the species. The two methods gave quite...
Tipo: Text
Palavras-chave: Merluccius merluccius; Méditerranée; Méthodologie; Évaluation des stocks; Démographie des captures; Mortalité par pêche; Merluccius merluccius; Mediterranean Sea; Methodology; Stock assessment; Population structure; Fishing mortality.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00188/29886/28341.pdf

Bilan energetique d'une population naturelle de Crepidula fornicata dans le bassin de Marennes-Oleron
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Heral, Maurice; Masse, H.
An energy budget has been evaluated for a natural population of Crepidula fornicata living at low water of spring tides in the oyster farming basin of Marennes-Oleron. This budget of production was estimated according to the position along the chain. The average biomass for an individual representative of the population was equivalent to 1.87 Kjoules, and the annual consumption C was 20.08 Kjoules/year. The energy budget expressed in percent of energy consummates was: C = Pg + Pr + Ps + R + F; 100 = 4.6 + 1.6 + 0.8 + 48 + 45. This budget is compared with literature data on other herbivorous gastropods and with those calculated for Crassostrea gigas in the same locality.
Tipo: Text
Palavras-chave: Bivalvia; Crepidula fornicata; Seasonal variations; Population structure; Energy budget; Bassin de Marennes Oléron; Bilan énergétique; Crepidula fornicata.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1181.pdf

Sex, size and timing: Sampling design for reliable population genetics analyses using microsatellite data
Provedor de dados: 5
Autores: Dubois, Quentin; Lebigre, Christophe; Schtickzelle, Nicolas; Turlure, Camille.
Population genetics is used in a wide variety of fields such as ecology and biodiversity conservation. How estimated genetic characteristics of natural populations can be influenced by the sampling design has been a long-standing concern. Multiple simulation and empirical studies illustrated the influence of both sample size and polymorphism of markers. However, our review of studies on butterfly population genetics indicates no consensus on sample size for the estimation of genetic diversity or differentiation. Furthermore, other aspects of sampling design (sex ratio and timing of sampling) were not addressed and their potential impact on genetic parameter estimates rarely explored. Using a large empirical dataset (with spatial and temporal replicates)...
Tipo: Text
Palavras-chave: Butterfly; Conservation; Genetic diversity; Metapopulation; Number of samples; Period of sampling; Population structure; Sampling scheme optimization; Sex ratio.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00416/52783/53664.pdf

Depth-dependent gene flow in Gulf of Mexico cold seep Lamellibrachia tubeworms (Annelida, Siboglinidae)
Provedor de dados: 5
Autores: Cowart, Dominique; Halanych, Kenneth M.; Schaeffer, Stephen W.; Fisher, Charles R.
Lamellibrachia vestimentiferan tubeworms form aggregations at hydrocarbon cold seeps in the deep Gulf of Mexico (GoM), creating structures that provide living space for other fauna. In the GoM, three Lamellibrachia taxa vary in morphology and depth ranges: Lamellibrachia luymesi (300–950 m), Lamellibrachia sp. 1 (950–2,604 m), and Lamellibrachia sp. 2 (1,175–3,304 m). While Lamellibrachia sp. 2 is consistently identified as a separate species, L. luymesi and sp. 1 cannot be discriminated using barcoding markers cytochrome oxidase subunit 1 (COI) and large ribosomal subunit rDNA (16S). To determine if limited gene flow was a factor in the formation of these taxa, we employed more quickly evolving markers, including mitochondrial cytochrome B (CYTB),...
Tipo: Text
Palavras-chave: Deep sea; Hydrocarbon seep; Microsatellite; Population structure; Siboglinid; Vestimentiferan tubeworm.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00194/30494/29935.pdf

Restriction to large-scale gene flow vs. regional panmixia among cold seep Escarpia spp. (Polychaeta, Siboglinidae)
Provedor de dados: 5
Autores: Cowart, Dominique; Huang, Chunya; Arnaud-haond, Sophie; Carney, Susan L.; Fisher, Charles R.; Schaeffer, Stephen W.
The history of colonization and dispersal in fauna distributed among deep-sea chemosynthetic ecosystems remains enigmatic and poorly understood because of an inability to mark and track individuals. A combination of molecular, morphological and environmental data improves understanding of spatial and temporal scales at which panmixia, disruption of gene flow or even speciation may occur. Vestimentiferan tubeworms of the genus Escarpia are important components of deep -sea cold seep ecosystems, as they provide long-term habitat for many other taxa. Three species of Escarpia, Escarpia spicata [Gulf of California (GoC)], Escarpia laminata [Gulf of Mexico (GoM)] and Escarpia southwardae (West African Cold Seeps), have been described based on morphology, but...
Tipo: Text
Palavras-chave: Deep sea; Hydrocarbon seep; Microsatellite; Population structure; Siboglinid; Vestimentiferan tubeworm.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00152/26354/24515.pdf

Large-scale distribution of three deep-water squaloid sharks: Integrating data on sex, maturity and environment
Provedor de dados: 5
Autores: Moura, Teresa; Jones, Emma; Clarke, Maurice W.; Cotton, Charles F.; Crozier, Paul; Daley, Ross K.; Diez, Guzman; Dobby, Helen; Dyb, Jan E.; Fossen, Inge; Irvine, Sarah B.; Jakobsdottir, Klara; Lopez-abellan, Luis J.; Lorance, Pascal; Pascual-alayon, Pedro; Severino, Ricardo B.; Figueiredo, Ivone.
Deep-water sharks exhibit species-specific reproductive strategies, which include segregation by sex, size and reproductive stage. However, due to the wide spatial distribution of most species, available information, usually collected at a regional scale, is usually not adequate to infer species reproductive spatial dynamics. This study draws together information on the distribution of reproductive stages of three species of squaliform sharks: Portuguese dogfish Centroscymnus coelolepis (Somniosidae), leafscale gulper shark Centrophorus squamosus (Centrophoridae) and birdbeak dogfish Deania calcea (Centrophoridae), gathering data from several geographical areas from the Atlantic, Indian and Pacific Oceans. For each species we analysed the sex ratio and the...
Tipo: Text
Palavras-chave: Commercial fishery data; Deep-sea; Life stage; Population structure; Survey data.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00188/29902/29420.pdf

Linking life-history traits, spatial distribution and abundance of two species of lugworms to bait collection: A case study for sustainable management plan
Provedor de dados: 5
Autores: De Cubber, Lola; Lefebvre, Sebastien; Fisseau, Charline; Cornille, Vincent; Gaudron, Sylvie Marylene.
Arenicola spp. are marine benthic polychaetes dug for bait by anglers. Without regulation, this activity can lead to the decrease of lugworms' population meanwhile affecting the physical characteristics of the beach and the biodiversity. Here, we identified through morphology and genetics two species of lugworms, Arenicola marina and A. defodiens, within a Marine Protected Area of the Eastern English Channel (France). For each species, abundance and spatial distribution were assessed using a stratified random sampling and interpolation at four studied sites, as well as some life-history traits. These data were compared to lugworms' collection data to estimate its sustainability and to provide potential management measures. At one site, A. marina was...
Tipo: Text
Palavras-chave: Arenicola marina; Arenicola defodiens; Spawning; Population structure; Size at first maturity; Recreational fisheries; Conservation; English channel.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00451/56284/60474.pdf

Disturbance induced decoupling between host genetics and composition of the associated microbiome
Provedor de dados: 5
Autores: Wegner, Karl Mathias; Volkenborn, Nils; Peter, Hannes; Eiler, Alexander.
Background  Studies of oyster microbiomes have revealed that a limited number of microbes, including pathogens, can dominate microbial communities in host tissues such as gills and gut. Much of the bacterial diversity however remains underexplored and unexplained, although environmental conditions and host genetics have been implicated. We used 454 next generation 16S rRNA amplicon sequencing of individually tagged PCR reactions to explore the diversity of bacterial communities in gill tissue of the invasive Pacific oyster Crassostrea gigas stemming from genetically differentiated beds under ambient outdoor conditions and after a multifaceted disturbance treatment imposing stress on the host. Results  While the gill associated microbial communities in...
Tipo: Text
Palavras-chave: Microbiota; Population structure; Stress; Pathogen; Biological invasion; Pacific oyster; Crassostrea gigas; Vibrio; Mycoplasma.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00171/28202/26430.pdf

Population structure and recruitment in mytilid bivalves from the Lucky Strike and Menez Gwen hydrothermal vent fields (37°17'N and 37°50'N on the Mid-Atlantic Ridge)
Provedor de dados: 5
Autores: Comtet, Thierry; Desbruyeres, Daniel.
Population structure and recruitment pattern of undescribed mytilid bivalves that dominate the animal communities associated with vents of the Lucky Strike and Menez Gwen hydrothermal vent fields (37 degrees 17' N and 37 degrees 50' N on the Mid-Atlantic Ridge) were studied from size-frequency analyses. Intra-site comparisons reveal that length-frequency distributions differ significantly from one location to the other. This spatial segregation of the sizes could be due to spatio-temporal variability in environmental conditions and to intraspecific competition processes, especially adult-larval interactions (competition for space and food resources, intraspecific larviphagy) that could prevent larvae from settling on surfaces covered by adults. A modal...
Tipo: Text
Palavras-chave: Hydrothermal vents; Mytilidae; Recruitment; Population structure; Size frequency; Spatial segregation; Intraspecific competition; Mid-Atlantic Ridge.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/00446/55799/62521.pdf

Genetic diversity, multiplicity of infection and population structure of Schistosoma mansoni isolates from human hosts in Ethiopia
Provedor de dados: 5
Autores: Aemero, Mulugeta; Boissier, Jerome; Climent, Deborah; Mone, Helene; Mouahid, Gabriel; Berhe, Nega; Erko, Berhanu.
Background: Human intestinal schistosomiasis caused by Schistosoma mansoni and urinary schistosomiasis caused by Schistosoma haematobium are endemic in Ethiopia. Although schistosomes look morphologically uniform, there is variation in infectivity, egg productivity and virulence due to variation in their genetic make. Knowing the genetic diversity and population structure of S. mansoni isolates will enable to understand and consider the possible variability in terms of infectivity, egg productivity and virulence. Methods: Between 2010 and 2011, genetic diversity and population structure of Schistosoma mansoni isolates from four endemic areas of Ethiopia was assessed using previously published 11 polymorphic microsatellite loci. Miracidia were hatched from...
Tipo: Text
Palavras-chave: Schistosoma mansoni; Microsatellite; Genetic diversity; Population structure; Ethiopia.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00302/41369/71868.pdf

Importance and future of individual markers for the ecosystem approach to fisheries
Provedor de dados: 5
Autores: Fromentin, Jean-marc; Ernande, Bruno; Fablet, Ronan; De Pontual, Helene.
The use of genetic, biochemical and electronic markers in population biology and ecology has been growing tremendously during the last two decades. The first part of this paper aims at reviewing the main principles and advances of these individual markers through a few key applications on exploited marine fish populations. The second part is more prospective and investigates some possibilities that could arise in the near future through: (i) the development of new markers, (ii) the combination of different markers and (iii) the combination of quantitative approaches-whether classical or new-with individual markers. It is finally stressed how crucial individual markers will be to unravel the biocomplexity of wild fish populations and the key role they...
Tipo: Text
Palavras-chave: Genetic marker; Biochemical marker; Electronic tag; Otolith; Isotope; Population structure; Statistical and mechanistic model; Fisheries.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11163/7522.pdf

Preliminary spatially disaggregated stock assessment of northern hake, a widely distributed stock of the north-east Atlantic
Provedor de dados: 5
Autores: Bertignac, Michel; Fernandez, Carmen; Methot, Richard.
European hake (Merluccius merluccius) is widely distributed over the north-east Atlantic shelf, from Norway to Mauritania. Despite its large distribution (covering ICES Division IIIa, Subareas IV, VI and VII and Divisions VIIIa,b,d, from Norway to the Bay of Biscay) and a complex population structure, the so-called northern stock of hake is currently assessed as a single unit, using a spatially aggregated implementation of the Stock Synthesis assessment model. In this study, a preliminary spatially explicit implementation of Stock Synthesis is developed, which accounts for the distribution of the hake population during its life cycle (nurseries and spawning areas) and the distribution of the fleets (trawlers, gillnetters and long-liners) exploiting the...
Tipo: Text
Palavras-chave: Northern hake; Spatial dynamics; Population structure; Spatial stock assessment.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00126/23764/21657.pdf

Structure et diversité génétique des populations de raie bouclée en Méditerranée
Provedor de dados: 5
Autores: Lecuyer, Romain.
Chondrichtyes are threatened by several disturbances among which is the significant development of fisheries during the 20th century. The Mediterranean sea has long been fished and keeps being intensely so by several nations that seek cost-effectiveness or food security above all. Such a background does not ease data recording and sharing for research purposes. This study mainly aims at assessing the population structure and status of thornback ray so as to avoid its deterioration due to bottom-trawl fisheries pressure, hardly reversible even with a sudden sound management. To do so, an extensive panel of nuclear genetic markers has been developed to analyze underlying structure along with differenciation and genetic diversity of Mediterranean populations....
Tipo: Text
Palavras-chave: Méditerranée; Structure de populations; Différenciation; Diversité génétique; SNP; Raja clavata; Mediterranean sea; Population structure; Differenciation; Genetic diversity; SNP; Raja clavata.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00667/77899/80091.pdf

Genealogical and molecular analysis of an Argentinean Angus seedstock herd
Provedor de dados: 46
Autores: Corva,P.M; Colavita,M.I; Legaz,G; Martínez,M.
Introduced in Argentina from the British Isles in 1879, the Angus progressively became the most popular beef cattle breed in the country. In this article the analysis of genealogical and molecular information generated in the registration process of progenies from an Angus seedstock herd is presented. The objectives were to analyze the genetic structure of the herd, and to use the acquired information to get insight of the history of the Angus breed in Argentina. Pedigree information from 16,611 individuals born between 1954 and 2012 was analyzed, including Black and Red Angus. Also available were genotypes of 17 microsatellites from 470 individuals born between 2005 and 2012. Identification of the most influential ancestors showed a trend that is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population structure; Coancestry; Microsatellites; Inbreeding.
Ano: 2015
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332015000300002

Genetic and ecological differentiation between the butterfly sisterspecies Colias alfacariensis and Colias hyale
Provedor de dados: 16
Autores: Cleary, Daniel F.R.; Descimon, Henri; Menken, Steph B.J.
Clear habitat separation between the sister species Colias alfacariensis and C. hyale is shown when occurring sympatrically. Colias hyale is found more often in moist cultivated pastures while Colias alfacariensis is more abundant in dry uncultivated habitat. Out of a total of 16 loci, no diagnostic loci were found between C. alfacariensis and C. hyale, and both species shared most major polymorphisms. Exceptions were the marked differences in allele frequencies at the HK locus and only C, hyale, but not C. alfacariensis was further invariable at the GOT2 locus, which is usually highly polymorphic in the Pieridae. Colias hyale has a significantly lower level of heterozygosity than its sister species C. alfacariensis. In Colias alfacariensis heterozygosity...
Tipo: Article / Letter to the editor
Palavras-chave: Lepidoptera; Pieridae; Allozymes; Population structure; Gene flow.
Ano: 2002
URL: http://www.repository.naturalis.nl/record/534385

Genetic differentiation and estimated levels of gene flow in members of the Gammarus pulex-group (Crustacea, Amphipoda) in western Europe
Provedor de dados: 16
Autores: Scheepmaker, Maarten.
Genetic differentiation of morphologically variable members of the G. pulex-group in northwestern Europe was investigated by electrophoresis at 20 enzyme loci. Five recently described related forms were examined with reference to the “classical” species G. pulex, G. wautieri and G. fossarum. G. pulex and G. wautieri were shown to be genetically homogeneous and clearly distinct species. In the other species, morphologically similar forms were shown to be genetically distant, and inter-areal intraspecific genetic differentiation may warrant recognition of subspecies or sibling species. In some cases, levels of reproductive isolation of the forms involved could be assessed by cross-breeding experiments. To estimate dispersal capabilities, gene flow levels...
Tipo: Article / Letter to the editor
Palavras-chave: Taxonomy; Distribution; Population structure; Intra-specific divergence; Gammarus.
Ano: 1990
URL: http://www.repository.naturalis.nl/record/504326

Phylogeography of the Neotropical catfish Pimelodus albicans (Siluriformes: Pimelodidae) from río de la Plata basin, South America, and conservation remarks
Provedor de dados: 83
Autores: Vergara,Julia; Azpelicueta,María de las Mercedes; Garcia,Graciela.
Pimelodus albicans Valenciennes, 1840 (common name "moncholo" or "bagre blanco") is an endemic species of the family Pimelodidae in the río de la Plata basin. Phylogenetic approach based on cytochrome b sequences was performed to test the existence of a unique evolutionary lineage in P. albicans and to discriminate populations units or subpopulations related to a migration behavior of this taxon in the río de la Plata basin. This study included 34 samples of P. albicans of different collecting sites in the río de la Plata estuary and in the río Arrecifes belonging to the río Paraná basin. Among 614 base pairs in the cytochrome b sequence data set, 203 were variable and 120 were phylogenetically informative sites in P. albicans. A total of twenty...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population structure; Cytochrome b gene.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000100009

Reproductive and population parameters of discus fish Symphysodon aequifasciatus Pellegrin, 1904 (Perciformes: Cichlidae) from Piagaçu-Purus Sustainable Development Reserve (RDS-PP), lower Purus River, Amazonas, Brazil
Provedor de dados: 83
Autores: Rossoni,Felipe; Amadio,Sidinéia; Ferreira,Efrem; Zuanon,Jansen.
The ornamental discus fish Symphysodon aequifasciatus Pellegrin, 1904, is a popular endemic cichlid species from the Amazon basin, however scientific information concerning biology and ecology in its natural habitat is scarce despite its importance on the international aquarium trade. In this study we evaluated reproductive parameters of S. aequifasciatus in natural habitat in Piagaçu-Purus Sustainable Development Reserve (RDS-PP), lower Purus River, Brazilian Amazon. Males are more frequent in the larger size classes and this might be related to the complex breeding behavior known for S. aequifasciatus. Values of L50 for both sexes corresponded to more than 60% of the maximum attained length which may indicate that energy allocation for somatic growth...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Ornamental fish; Population structure; Breeding strategy.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000200018

A multi-approach analysis of the genetic diversity in populations of Astyanax aff. bimaculatus Linnaeus, 1758 (Teleostei: Characidae) from Northeastern Brazil
Provedor de dados: 83
Autores: Pamponet,Vanessa de Carvalho Cayres; Carneiro,Paulo Luiz Souza; Affonso,Paulo Roberto Antunes de Mello; Miranda,Viviam Souto; Silva Júnior,Juvenal Cordeiro; Oliveira,Claudine Gonçalves de; Gaiotto,Fernanda Amato.
Few reports are available about the ichthyofauna of typical semi-arid rivers, although the regional diversity has been constantly threatened by human activities, mainly related to impoundment and construction of dams. The goal of the present work was to evaluate using different methods, the population genetic structure of a characin fish, Astyanax aff. bimaculatus, widespread throughout hydrographic basins of Bahia, Northeastern Brazil. Morphological (meristic and morphometric data), cytogenetic (karyotype and Ag-NOR), and molecular (RAPD and SPAR) analyses were carried out in specimens collected upstream and downstream of Pedra Dam, in the main channel of Contas River (Contas River Basin), and in the Mineiro stream, which belongs to the adjacent Recôncavo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphometry; Cytogenetics; RAPD; Population structure; Contas River.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400010

Population characteristics, space use and habitat associations of the seahorse Hippocampus reidi (Teleostei: Syngnathidae)
Provedor de dados: 83
Autores: Rosa,Ierecê Lucena; Oliveira,Tacyana P. R.; Castro,André L. C.; Moraes,Luiz E. de Souza; Xavier,Josias H. A.; Nottingham,Mara C.; Dias,Thelma L. P.; Bruto-Costa,Leonardo V.; Araújo,Maria E.; Birolo,Alesandra B.; Mai,Ana C. G.; Monteiro-Neto,Cassiano.
This paper provides a case study of a threatened seahorse species, Hippocampus reidi, highlighting the importance of using ecological information to assist conservation and management initiatives. Underwater visual sighting data (50 x 2m transect) gathered along the NE, SE and S portions of the Brazilian coast revealed an unequal distribution across localities, perhaps related to harvesting pressure, and a mean density of 0.026 ind.m-2. Our findings suggest some restricted spatial use by H. reidi, which was consistent with its estimated home range, and with re-sighting of specimens. Reproduction was recorded year-round, however productive peaks may exist. Components of habitat structure mostly used as anchoring points were mangrove plants, macroalgae,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Longsnout seahorse; Mangrove; Habitat use; Population structure; Brazil; Conservation.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000300020

Reproductive and population dynamics of the Bay whiff Citharichthys spilopterus Günther, 1862 (Pleuronectiformes: Paralichthyidae) in the Mamanguá Inlet, Rio de Janeiro, Brazil
Provedor de dados: 83
Autores: Dias,June Ferraz; Fiadi,Carla Bertolucci; Silbiger,Helcy Lylian Nogueira; Soares,Lucy Satiko Hashimoto.
Bay whiffs, Citharichthys spilopterus, were sampled in Mamanguá Inlet between March 1990 and March 1992 for evaluation of its reproductive dynamic. Bay whiffs presented a crescent gradient of abundance from the deepest to the shallowest stations. The mean total length by oceanographic station showed a clear tendency of a relationship between bigger sizes and higher depths. Males predominated along the studied period and on the smallest length groups. Higher values of alometric condition factor, gonadosomatic relationship and spawning stage of maturity indicated a higher degree of development of the gonads on March and November. Histological analysis showed spawning females in March and May 1990 in the stations closer to the mouth of the Inlet, and spawned...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population structure; Reproduction; Gonadosomatic relationship; Gonadal maturation; Southeast Brazil.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000300009

Estructura poblacional de Emerita sp (Crustacea: Decapoda) en playa Levisa, Granma, Cuba
Provedor de dados: 20
Autores: Apín, Y. C.; Ocaña, F. A.; Cala de la Hera, Y. R.; Gómez, L. M.
El género Emerita es muy común en playas de arena, donde juega un importante papel en las tramas tróficas. En este trabajo se caracteriza la estructura poblacional de Emerita sp. en playa Levisa, Granma, Cuba. Se analizan variables como la densidad poblacional, biomasa, talla de los individuos, así como abundancia de hembras fresadas y la talla mínima de las hembras ovígeras, en cuatro estaciones de muestreo. El valor más elevado de la densidad total fue de 188.3 ind. m-2 en el mes de octubre, mientras que en julio se obtuvo la mayor densidad de hembras ovígeras con un valor de 40 ind. m-2. Los valores de biomasa total (húmeda) oscilaron entre 14.5 g m-2 y 37.7 g m-2. Se clasificaron los individuos por tallas en 18 intervalos de clase, presentando...
Tipo: Preprint
Palavras-chave: Population structure; Population structure; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2010
URL: http://hdl.handle.net/1834/3634

Distribución, abundancia y estructura poblacional de los eufáusidos en el Estrecho Bransfield (Antártida), durante el verano austral 1998
Provedor de dados: 20
Autores: Castañeda, P.
Durante la VII Expedición Ecuatoriana a la Antártida, en el verano austral 1998, los días comprendidos entre el 24 al 27 de enero de 1998, se realizaron 14 arrastres planctónicos oblicuos en el Estrecho Bransfield. Las colectas fueron realizadas con una red bongo de 0.6 m de diámetro y 600μ de abertura de malla, efectuados a partir de los 600 metros de profundidad. De 1228 especímenes estimados, a 198 de estos se determinó la especie, sexo y longitud estándar. Se identificaron 2 géneros y 3 especies: Thysanoessa sp., (665 ind/1000 m3), T. macrura (296 ind/1000 m3) y Euphausia superba (267 ind/1000 m3). Se destaca la predominancia numérica de Thysanoessa sp., sobre E. superba. En el ámbito general los individuos adultos dominaron la mayoría de las capturas,...
Tipo: Journal Contribution
Palavras-chave: Distribution records; Abundance; Population structure; Zooplankton; Polar waters; Population structure; Zooplankton; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_15490.
Ano: 1998
URL: http://hdl.handle.net/1834/3843

Condiciones del plancton en una estación fija: Puerto El Morro-Playas, Golfo de Guayaquil, 2000-2002
Provedor de dados: 20
Autores: Bonilla Coello, M.A.; Plúas, F.; Camposano, J.
En este estudio se examina la abundancia estructura poblacional y variación temporal del plancton, especialmente de copépodos en el Golfo de Guayaquil, a través de tres años de estudio, en condición no El Niño.
Tipo: Journal Contribution
Palavras-chave: Plankton; Phytoplankton; Abundance; Distribution; Zooplankton; Marine crustaceans; Fixed stations; Population structure; Diatoms; Fish eggs; Fish larvae; Population structure; Plankton; Phytoplankton; Distribution; Zooplankton; Diatoms; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_32657; Http://aims.fao.org/aos/agrovoc/c_2924.
Ano: 2002
URL: http://hdl.handle.net/1834/2315

Caractères biométriques de la squille squilla mantis dans les eaux tunisiennes
Provedor de dados: 20
Autores: Mili, S.; Jarboui, O.; Missaoui, H.
Pour l’étude biométrique de la squille Squilla mantis, un échantillonnage régulier a été réalisé dans le golfe de Tunis, le golfe de Hammamet et le golfe de Gabès de janvier 2005 à décembre 2006. Les équations morphométriques de la squille, dans le golfe de Gabès, ont montré que la croissance relative du telson, celle de la masse totale et celle de la masse éviscérée par rapport à celle du céphalothorax sont caractérisées par une allométrie positive. Par contre, la longueur totale croît négativement par rapport à celle du céphalothorax. Pour le golfe de Hammamet, ces caractères ont une croissance marquée par une allométrie négative à part la masse éviscérée. Les équations morphométriques de la squille du golfe de Tunis ont montré une allométrie positive...
Tipo: Journal Contribution
Palavras-chave: Biometrics; Comparative studies; Population dynamics; Population structure; Statistical analysis; Squilla mantis; Http://aims.fao.org/aos/agrovoc/c_46197.
Ano: 2008
URL: http://hdl.handle.net/1834/4241

Contribución al estudio biológico-pesquero del pez gallo, Callorhynchus callorhynchus (Linné, 1758) Berg, 1895, en el Golfo San Matías
Provedor de dados: 20
Autores: Di Giácomo, E.E.
Tipo: Theses and Dissertations
Palavras-chave: Taxonomy; Stock assessment; Population structure; Reproduction; Trophic relationships; Taxonomy; Stock assessment; Population structure; Reproduction; Http://aims.fao.org/aos/agrovoc/c_7631; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_6507.
Ano: 1990
URL: http://hdl.handle.net/1834/4067

Reef associated molluscan fauna of the Santa Marta Area, Caribbean Coast of Colombia
Provedor de dados: 20
Autores: Díaz, J.M.; Escobar, L.A.; Velásquez, L.E.
Se registra un total de 263 especies de moluscos (201 encontradas vivas) colectadas entre 1982 y 1989 en siete localidades arrecifales de la región de Santa-Marta, Colombia. Los moluscos fueron ordenados de acuerdo a las zonas de arrecife en que fueron encontradas, a sus hábitos alimentarios y a su modo de vida. El dendrograma resultante del análisis de similaridad faunística entre las zonas muestra que existen tres tipos básicos de comunidades en el arrecife (asentadas respectivamente en zonas someras, zona de declive arrecifal y zona con coral muerto y arena), más una comunidad pobre en especies y restringida a la zona dominada por el coral Agaricia tenuifo/ia. Existen algunas diferencias entre las zonas arrecifales en cuanto a la distribución porcentual...
Tipo: Journal Contribution
Palavras-chave: Malacology; Habitat; Geographical distribution; Interspecific relationships; Feeding behaviour; Population structure; Abundance; Malacology; Geographical distribution; Feeding behaviour; Population structure; Http://aims.fao.org/aos/agrovoc/c_4528; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 1990
URL: http://hdl.handle.net/1834/3890

Estructura de la comunidad epifaunal asociada a colonias de vida libre del Hidrocoral Millepora alcicornis Linnaeus 1758 en Bahía Portete, Caribe colombiano
Provedor de dados: 20
Autores: Castro S., C.; Monroy L., M.; Solano, O.D.
The epifaunal community associated with free-living colonies of Millepora alcicornis, the dominant coral species in Portete Bay, was characterized from twenty living colonies randomly collected within a shallow Thalassia testudinum seabed. The three-dimensional growth colonies sheltered 15 families, 15 genera and 18 mobile invertebrate species. The 97% of individuals was represented by decapods crustaceans specially adapted as to live in association with the host. Within them, the porcelanid Petrolisthes armatus, representing 79% of the epifauna (961 individuals), was exclusively found in a juvenile stage suggesting that M. alcicornis is mainly used by this species as a nursery zone. The epifaunal composition is partially related to coral living tissue...
Tipo: Journal Contribution
Palavras-chave: Population structure; Crustacean fisheries; Population structure; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2006
URL: http://hdl.handle.net/1834/1973

Informe sobre el muestreo de desembarque de anchoíta (Engraulis anchoita) y caballa (Scomber japonicus) en el puerto de Mar del Plata: período septiembre 1999-enero 2000, con algunos comentarios sobre el manejo de estos recursos.
Provedor de dados: 20
Autores: Garciarena, A.D.; Perrotta, R.G.; López, F.
The chub mackerel Scomber japonicus and anchovy Engraulis anchoita commercial landings at the Mar del Plata (Buenos Aires prov., Argentina) seaport during the September 1999-January 2000 period are studied. A total of 14 chub mackerel samples were taken for total length measurements exclusively and 5 anchovy sub-samples and 1 chub mackerel sub-sample were analyzed to record individual data total length, weight, sex, sexual stage, age from otoliths readings . Most of the fish caught for both species were adults and only a small fraction of chub mackerel juveniles was found in December 1999. Length-at-fifty-percent-maturity was calculated, length-weight and length-age relationships were fitted and length growth parameters estimated. Sea surface temperature...
Tipo: Journal Contribution
Palavras-chave: Commercial fishing; Population structure; Catch/effort; Size distribution; Mackerel fisheries; Population structure; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2002
URL: http://hdl.handle.net/1834/2545

Observaciones sobre una población de Strombus gigas L. en la Ensenada de Nenguange, Caribe colombiano
Provedor de dados: 20
Autores: Botero, L.
Se estudia una población de Strombus gigas localizada a 12 m de profundidad en la Ensenada de Nenguange. La población ocupa un área aproximada de 98400 m². La densidad promedio más alta registrada fue de 1 caracol/14 m * y la más baja de 1 caracol/ 33 m² Estas variaciones en la densidad parecen estar relacionados con las condiciones ambientales, especialmente agitación y temperatura del agua. Los caracoles de esta población se caracterizan por una concha masiva totalmente recubierta de algas, corales, esponjas y otros organismos. El grueso labio externo es constantemente erodado por animales perforadores y reemplazado en grosor por el caracol. Se encontró una sola clase de tamaños de individuos y una casi completa ausencia de juveniles. Se registró...
Tipo: Journal Contribution
Palavras-chave: Marine molluscs; Population structure; Shells; Population structure; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 1984
URL: http://hdl.handle.net/1834/4032

Estructura del manglar en el Delta exterior del Río Magdalena-Ciénaga Grande de Santa Marta, una zona tensionada por alteraciones del equilibrio hídrico
Provedor de dados: 20
Autores: Serrano-Díaz, L.A.; Botero, L.; Cardona, P.; Mancera-Pineda, J.E.
La estructura de los bosques de manglar del Delta Exterior del Río Magdalena-Ciénaga Grande de Santa Marta (DERM-CGSM) y algunas variables abióticas de sus suelos fueron cuantificadas con el objeto principal de proveer una línea de base para evaluaciones futuras de cambios en el ecosistema, como consecuencia de la reapertura de caños de agua dulce provenientes del Río Magdalena. Se encontró que los bosques que rodean el complejo lagunar exhiben diferentes grados de desarrollo estructural, desde casi ningún desarrollo (completamente muertos) hasta bosques complejos. El mejor desarrollo estructural se encontró en las estaciones localizadas sobre el Caño El Jobo (JOB) y sobre la Ciénaga de la Aguja (AGU) en la zona suroccidental del área de estudio. La...
Tipo: Journal Contribution
Palavras-chave: Coastal lagoons; Estuaries; Mangroves; Ecology; Population structure; Salinity effects; Lethal limits; Habitat; Redox potential; Condition factor; Redox potential; Estuaries; Ecology; Population structure; Coastal lagoons; Mangroves; Http://aims.fao.org/aos/agrovoc/c_6482; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_1697; Http://aims.fao.org/aos/agrovoc/c_16190.
Ano: 1995
URL: http://hdl.handle.net/1834/3814

Análisis de la distribución y dinámica poblacional de lenguados de la Provincia de Buenos Aires (Pisces, Bothidae)
Provedor de dados: 20
Autores: Fabré, N.N.
Los lenguados constituyen un importante recurso pesquero en el Mar Argentino. Más que en los volúmenes desembarcados (9 .731 t en 1991), esta importancia se centra en su elevado valor de comercialización debido a la alta calidad de su carne. Atendiendo a los desembarques totales realizados en el Mercado de Concentración Pesquera de Mar del Plata, los lenguados ocupan el octavo lugar. Estos desembarques están compuestos principalmente por especies de porte mediano a grande pertenecientes al género Paralichthys, y por ejemplares de tamaño mediano o pequeño de las especies Xystreuris rasile, y en menor proporción, Paralichthys isosceles. Este recurso es explotado, en el sector bonaerense, por las flotas de rada o ría y costera, mientras que la flota de altura...
Tipo: Theses and Dissertations
Palavras-chave: Geographical distribution; Population dynamics; Population structure; Growth; Reproduction; Mortality; Environmental effects; Ecosystems; Marine fish.
Ano: 1992
URL: http://hdl.handle.net/1834/5158

Diagnóstico del recurso ostión del sur
Provedor de dados: 20
Autores: Cornejo, S.; Daza, E.; Guzmán, L.
El presente informe da cuenta de los resultados de las actividades realizadas para evaluar el estado de los bancos de ostión del sur (Chlamys vitrea), en sectores selectos de la región de Magallanes y Antártica Chilena (XII Región). Se incorporan también propuestas de administración y medidas para la recuperación  de las poblaciones del recurso. Se presenta la ubicación geográfica de los bancos identificados en cada fiordo y la superficie ocupada por ellos, además de las estructuras de tamaño, tallas medias, fracción de ejemplares sobre la talla mínima legal, relación longitud peso, pesos medios, estimaciones de densidad y abundancia, además de las estimaciones de las capturas totales permisibles (CTPs).
Tipo: Report
Palavras-chave: Marine molluscs; Resource management; Population characteristics; Population density; Abundance; Population structure; Population structure; Resource management; Population density; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_6524; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 2005
URL: http://hdl.handle.net/1834/1755

El ecosistema de la plataforma patagónica austral, marzo-abril 2000. Composición, abundancia y distribución del zooplancton.
Provedor de dados: 20
Autores: Sabatini, M.
The abundance, distribution and structure of the zooplankton community in southern Patagonia (SW Atlantic Ocean) were studied during late summer (March-April 2000) from samples obtained with Nackthai (390 ~km) and Multinet (150 ~km) samplers. Total concentrations of zooplankton biomass, integrated in the water column, ranged between 1.0 and 14.5 g m-2 (dry weight) and reached the highest values in the mid and outer shelf off Bahía Grande (Santa Cruz Prov., Argentina) (51~'S). The &lt; 5 mm size fraction, composed mainly of copepods represented, on average, 45% of the total; amphipods and euphausiids accounted for 20% and 31%, respectively. Amphipods were, almost exclusively, Themisto gaudichaudii and euphausiids most abundant species Euphausia lucens and...
Tipo: Journal Contribution
Palavras-chave: Zooplankton; Biomass; Population structure; Geographical distribution; Continental shelves; Zooplankton; Biomass; Population structure; Geographical distribution; Continental shelves; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_32413.
Ano: 2008
URL: http://hdl.handle.net/1834/3142

Ecología trófica del lenguado Paralichthys patagonicus (Jordan, 1889) en el Ecosistema Costero Argentino-Uruguayo
Provedor de dados: 20
Autores: Troccoli, G.H.
Se determinaron los hábitos alimentarios y la composición de la dieta del lenguado patagónico Paralichthys patagonicus (Jordan, 1889) a partir de análisis cualitativos y cuantitativos del contenido estomacal. Los ejemplares provinieron de 16 muestreos de desembarque de la flota comercial realizados entre febrero de 2009 y abril de 2010 en el puerto de Mar del Plata (Prov. Buenos Aores, Argentina). Se analizaron un total de 828 lenguados de los cuales el 61,8% (512) fueron hembras y 36,7% (304) machos. Del total de estómagos analizados, el 32,9% (272) presentó alimento (184 hembras y 84 machos). Paralichthys patagonicus es un predador ictiófago de amplio espectro trófico (20 ítems presas). Anchoíta (Engraulis anchoita) fue la presa más consumida, seguida...
Tipo: Theses and Dissertations
Palavras-chave: Feeding behaviour; Trophic levels; Predator prey interactions; Population structure; Stomach content; Paralichthys patagonicus; Marine environment.
Ano: 2011
URL: http://hdl.handle.net/1834/4522

Structure générale des peuplements d’annélides polychètes dans le secteur n-e du golfe de Tunis
Provedor de dados: 20
Autores: Zaabi, S.; Afli, A.
Cette étude a pour but de déterminer la structure générale des peuplements d’Annélides Polychètes le long de la côte N-E du golfe de Tunis. Au total, neuf stations ont été échantillonnées et les spécimens récoltés ont été identifiés, pour la plus part, jusqu’au niveau spécifique. Ensuite, des analyses de la classification ascendante hiérarchique ont été réalisées sur les abondances des différentes espèces aux stations étudiées, ce qui a permis de définir trois groupes de stations faunistiquement plus homogènes avec leurs espèces leaders. Parallèlement, les principaux paramètres synthétiques descriptifs de biodiversité (Richesse spécifique, Abondance, Indice de Shannon et Equitabilité) ont été calculés pour chaque groupe ainsi défini, et des analyses...
Tipo: Journal Contribution
Palavras-chave: Abundance; Population structure; Species diversity; Zoobenthos; Population structure; Species diversity; Zoobenthos; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_33954; Http://aims.fao.org/aos/agrovoc/c_15487.
Ano: 2005
URL: http://hdl.handle.net/1834/3738

Coral reefs of Gorgona Island, Colombia, with special reference to corallivores and their influence on community structure and reef development
Provedor de dados: 20
Autores: Glynn, P.W.; Prahl, H. von; Guhl, F.
Este estudio presenta un breve resumen de la estructura y distribución de los arrecifes coralinos de la Isla de Gorgona. Se  investigaron los organismos coralivoros, comparándolos con los de otras localidades del Pacifico Americano; de esta forma se establece un criterio, para conocer las diferencias regionales y las interacciones bióticas sobre las diferentes comunidades coralinas.  La Isla de Gorgona se localiza hacia el excremo sur de la provincia de Panamá panamá Bight), distante unos 30 km de la franja costera aluvial, lo que la aleja considerablemente del efecto directo de afloramientos y derrames de agua dulce, provenientes de los ríos costeros. El equinodermo asteroideo, Acanthaster, que es uno de los coralivoros que mas estragos causa en las...
Tipo: Journal Contribution
Palavras-chave: Coral reefs; Geographical distribution; Population structure; Coral reefs; Geographical distribution; Population structure; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 1982
URL: http://hdl.handle.net/1834/3968

La décadence d'une ville précoloniale du Togo, Aného, en pays Guin
Provedor de dados: 20
Autores: Dovi, Q.; Nyassogbo, G.
Tipo: Journal Contribution
Palavras-chave: Pays guin; Aného; Coastal zone; Colonization; Environmental conditions; Environmental impact; Nutritive value; Population density; Population structure; Product development; Rivers; Environmental impact; Nutritive value; Population structure; Rivers; Environmental conditions; Population density; Product development; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_5278; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_6112; Http://aims.fao.org/aos/agrovoc/c_16018.
Ano: 2003
URL: http://hdl.handle.net/1834/1067

La caballa (Scomber japonicus) y las condiciones ambientales en el area bonaerense de El Rincón (39°- 40°30' S), agosto 1996.
Provedor de dados: 20
Autores: Perrotta, R.G.; Madirolas, A.; Viñas, M.D.; Akselman, R.; Guerrero, R.A.; Sánchez, M.F.; López, F.; Castro Machado, F.; Macchi, G.J.
In August 1996 acoustic methods were employed to estimate mackerel (Scomber japonicus) abundance in the Buenos Aires, Argentina shelf area of "El Rincón" (4,287 mn2), located between 39°- 40° 30' S. Results showed a biomass estimate of 77,260 t. ASIMRAD EK-500 equipment operated with a 38 KHz split-beam transducer was used. Midwater fishing trawls were employed to identify echotraces and to collect mackerel samples.Trawls 4 and 5 were the most successful. Samples included only adult fish  (310-470 mm Lt and ages ranging 2-11). Length and weight growth parameters and mortality rates were estimated. Analysis of the stomach contents revealed that mackerel was feeding exclusively on zooplankters over 2 mmlength. The analysis of the characteristics (dimensions...
Tipo: Journal Contribution
Palavras-chave: Abundance; Biomass; Population structure; Zooplankton; Environmental conditions; Echo surveys; Biomass; Population structure; Zooplankton; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_32980.
Ano: 1999
URL: http://hdl.handle.net/1834/2529

Influencia ambiental en la distribución espacial de las clases de edad de pez palo (Percophis brasiliensis) en el Sistema Costero del Atlántico Sudoccidental (34°-41° S)
Provedor de dados: 20
Autores: Barretto, A.C.
The age-class distribution of the Brazilian flathead Percophis brasiliensis in relation to environmental variables in spring and winter, and the growth of both sexes, were studied in the SW Atlantic Coastal System (SACS)(34°S-31° S). Growth was studied from 1449 individuals (n=853, spring (1998 + 2000), n=596, winter (2004)) to which size (TL), sex, and age were determined. Age was determined considering that an opaque plus a hyaline band (present in the transverse section of the sagitta otolith) represented 1 year of life. The age-class distribution in spring and winter was established through hierarchical clustering and non-metric multi-dimensional scaling (nMDS analysis). This analysis grouped sampling stations (n=109, spring 1998; n=160, winter 2004)...
Tipo: Theses and Dissertations
Palavras-chave: Age groups; Age composition; Environmental factors; Geographical distribution; Population structure; Growth; Environmental effects; Coastal waters; Age composition; Environmental factors; Geographical distribution; Population structure; Growth; Age groups; Coastal waters; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_28628; Http://aims.fao.org/aos/agrovoc/c_25205.
Ano: 2007
URL: http://hdl.handle.net/1834/3017

Estimaciones de la biomasa de merluza (Merluccius hubbsi) en los sectores argentino y uruguayo de la Zona Común de pesca argentino-uruguaya (34º 00º S-39º 30º S) Y en el área que se extiende hasta 41º S (ZEE Argentina) en 1994, 1996-2001 y 2003
Provedor de dados: 20
Autores: Bezzi, S.I.; Ibáñez, P.M.
Hake (Merluccius hubbsi) biomass in the Argentine and Uruguayan sectors of the Argentine-Uruguayan Common Fishing Zone (AUCFZ) and in the area that extends from the limit of the shared zone to 41° S was estimated (SW Atlantic Ocean). The contribution to the strata total biomass in each sector was analyzed and complemented with observations on the structure of the population. The basic data to estimate biomass derived from the evaluation surveys of the Hake Project carried out in winter or spring 1994, 1996-2001 and 2003. In 1999 biomass north of 41° S decreased to 30.  (112,280 t) of the estimates made for 1994. In 2000 it increased to 165,000 t and in 2003 it was estimated at 156,407 t. A remarkable decrease of the AUCFZ percentage of contribution to the...
Tipo: Journal Contribution
Palavras-chave: Size distribution; Biomass; Population structure; Exclusive economic zone; Biomass; Population structure; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2009
URL: http://hdl.handle.net/1834/3463

Crecimiento del abanico de mar Gorgonia ventalina (Linnaeus, 1758) (Cnidaria: Gorgoniidae) en el área de Santa Marta, Caribe colombiano
Provedor de dados: 20
Autores: Manrique Rodríguez, N.; Bejarano Chavarro, S.; Garzón Ferreira, J.
As a contribution to the biological knowledge about the sea fan Gorgonia ventalina and the use of this information as a tool to generate conservation and management strategies for this threatened species, a study about its annual growth rate, in different reef areas in Santa Marta and the National Natural Park Tayrona in the Colombian Caribbean took place. Manual measurements of 35 colonies were analyzed and images of 11 colonies were recorded in the beginning and in the end of the field stage. The annual growth rate varies among colonies and areas where measurements were taken. The average annual growth rate obtained with both of the methods was high and oscillated between 7.6 and 8.1 cm/year in height and between 6.9 and 8.3 cm/year wide. The total area...
Tipo: Journal Contribution
Palavras-chave: Growth; Population characteristics; Population structure; Growth; Population structure; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2006
URL: http://hdl.handle.net/1834/1981

Sustentabilidad de la explotacion del gatuzo Mustelus schmitti, en el ecosistema costero bonaerense (34 - 42°S)
Provedor de dados: 20
Autores: Cortés, F.
The life history of Chondrichthyans results in a low capacity to recover from the fishery human impact, Mustelus schmitti is the most landing shark in Argentina (SW Atlantic)where reductions in the abundance have been detected. The sustainability of M. schmitti to exploitation using a demographic analysis, was examined. The intrinsic rate of population increase (r)and extinction risk under several harvesting strategies were estimated. For this purpose a stage-structured female-only matrix model was applied, considering the mortality and reproductive parameters to each stage. The estimate of length at maturity from the logistic curve was 56.04 cm. The fertility per female ranged between 1 and 15 pups and it was increased with total length. The Mortality...
Tipo: Theses and Dissertations
Palavras-chave: Exploitation; Natural mortality; Shark fisheries; Stock assessment; Population structure; Stock assessment; Population structure; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2007
URL: http://hdl.handle.net/1834/2597

Aspectos biológico-pesqueros del abadejo (Genypterus blacodes)
Provedor de dados: 20
Autores: Renzi, M.A.
The kingklip is one of the species that has been traditionally exploited in the Argentine Sea. Although captures were not very important, they have been increased in the last years. In this paper, the structure of the concentration areas of summer, spring and winter distribution and other biological aspects were analyzed, on the basis of the data collected during cruises carried out by R/V"Walther Herwig" and R/V"Shinkai Maru" in Argentine waters during 1978/79. The trophic spectrum of the kingklip comprises mainly food species of the Classes Pisces and Crustacea as well as other complementary groups like Mollusca, Brachiopoda and haliacea.
Tipo: Journal Contribution
Palavras-chave: Geographical distribution; Population structure; Size distribution; Feeding; Length-weight relationships; Food chains; Trophic relationships; Geographical distribution; Population structure; Feeding; Food chains; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_3014.
Ano: 1986
URL: http://hdl.handle.net/1834/2027

Caractérisation et variation phénotypique et biologique des deux sexes du sandre "Sander lucioperca" (l., 1758) (teleosteen, percidae) dans la retenue de barrage de Nebhana (Tunisie Centrale).
Provedor de dados: 20
Autores: Turki, O.; M'Hetli, M.; Chriki, A.; Kraiem, M.M.
Dans le but de caractériser phénotypiquement et biologiquement la population de sandre (Sander lucioperca (L, 1758)), et de détecter une éventuelle variabilité entre les sexes, une étude des variables méristiques et morphométriques ainsi que la croissance, a concerné 133 mâles et 166 femelles issus de la retenue de barrage de Nebhana. Le choix des variables méristiques et morphométriques a été décelé à partir de travaux bibliographiques montrant un taux important de variabilité chez les poissons marins et d'eau douce. Ainsi 9 caractères méristiques et 23 variables morphométriques ont été retenus. Les résultats ont montré une invariance des caractères méristiques entre les mâles et les femelles. Quant aux rapports morphométriques, les mâles diffèrent des...
Tipo: Journal Contribution
Palavras-chave: Animal morphology; Biological data; Cell differentiation; Comparative studies; Freshwater fish; Growth; Meristic counts; Morphometry; Phenotypes; Phenotypic variations; Population structure; Water reservoirs; Sex; Sex characters; Marine fisheries; Pike perch.
Ano: 2009
URL: http://hdl.handle.net/1834/4748

Aspectos biológicos y ecológicos de Mytilopsis sallei (Recluz, 1849) (Bivalvia: Dreissenidae) en bancos de ostra de la Ciénaga Grande de Santa Marta, Caribe colombiano
Provedor de dados: 20
Autores: Puyana, Mónica.
Mytilopsis sallei es una especie que se encuentra ampliamente distribuida sobre sustratos duros en la Ciénaga Grande de Santa Marta, siendo particularmente abundante sobre bancos de ostra de mangle (Crassostrea rhizophorae), donde alcanza densidades de hasta 5000 indiv/m2. Aunque posee una amplia tolerancia a variaciones en la salinidad y temperatura, prefiere aquellos lugares donde la afluencia de aguas dulces es constante. Puede además tolerar aguas turbias con un alto contenido de sedimentos, como en la desembocadura de los ríos. M. sallei no parece aparentemente, competir con la ostra, incluso en aquellos bancos sometidos a intensa explotación. Esto se debe a las preferencias ambientales de cada especie y a la alta productividad de las aguas de la...
Tipo: Journal Contribution
Palavras-chave: Ecology; Population structure; Salinity effects; Temperature effects; Density; Condition factor; Turbidity; Interspecific relationships; Population dynamics; Coastal lagoons; Estuaries; Ecology; Population structure; Turbidity; Estuaries; Density; Population dynamics; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_15043; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_2186; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1995
URL: http://hdl.handle.net/1834/3802

Estudio de algunos aspectos del ciclo vital de la merluza de cola Macruronus magellanicus, Lonnberg, 1907.
Provedor de dados: 20
Autores: Giussi, A.R.
Long tailed hake Macruronus magellanicus, is a demersal fish,distributed in the SW Atlantic Ocean, in Malvinas Current waters,from 36° and 55°S, mainly between 50m and 200m depth. The species is also distributed in Chilenian waters in the Pacific Ocean, being caught in the Magellan Strait and the Beagle Channel. Age determination was estimated with the sagittae otoliths, in which only one ring is formed during the year. Growth parameters were calculated directly and with back calculated methodology, no differences were observed between the results. Differences in growth sexes were evident from 3 years old. The oldest age observed was 13. Different distributional areas of adults through out the year could suggest a migratory movement in northern waters of...
Tipo: Theses and Dissertations
Palavras-chave: Life cycle; Growth; Otoliths; Age determination; Reproduction; Population dynamics; Mortality; Population structure; Fishery surveys; Fishing grounds; Geographical distribution; Back calculation; Growth; Otoliths; Age determination; Population structure; Geographical distribution; Life cycle; Reproduction; Population dynamics; Mortality; Fishing grounds; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_24110; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_4317; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_4945; Http://aims.fao.org/aos/agrovoc/c_2947.
Ano: 1996
URL: http://hdl.handle.net/1834/1488

Age et croîssance du chinchard à quelque jaune (trachurus méditerraneus) dans la région nord de la Tunisie
Provedor de dados: 20
Autores: Fezzani Serbaji, S.; Chemmam-A, B.; Ben Salem, M.
Le chinchard à queue jaune est un Carangidae qui fait l’objet d’une exploitation par les différents types de pêche le long des côtes tunisiennes. Dans le présent travail on se propose d’étudier l’âge et la croissance sur la base de la distribution des fréquences de taille dans la région Nord de la Tunisie. La décomposition de ces fréquences de taille est réalisée suivant la méthode de Battacharya (1967). Deux périodes sont considérées, la première correspond à l’année 1998 et la seconde s’étale entre Novembre -1999 et Décembre -2000. Pour la première période, 6 classes d’âges ont pu être identifiées alors que pour la seconde cette valeur est de 7. Les équations de croissance linéaire annuelle suivant le modèle Von Bertalanffy (1938) ont été établies.
Tipo: Journal Contribution
Palavras-chave: Trachurus mediterraneus; Age; Age composition; Frequency; Growth; Population structure; Size distribution; Horse mackerel fisheries; Age composition; Growth; Population structure; Age; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_186.
Ano: 2006
URL: http://hdl.handle.net/1834/4276

Programa temporal de evaluación hidroacústica de merluza del sur en aguas interiores de la X y XI Regiones, año 2002. Informe final corregido
Provedor de dados: 20
Autores: Lillo, S.; Céspedes, R.; Barbieri, M.A.; Saavedra, A.; Gálvez, P.
Se presentan los resultados de la evaluación de la biomasa y la distribución espacial de la merluza del sur (Merluccius australis), estructurado por tallas y edad en las aguas interiores de la X y XI Regiones aplicando el método hidroacústico. También se estima la abundancia relativa y la importancia de la fauna acompañante proveniente de los lances de pesca con arrastre a mediagua. Con la información recolectada en el Crucero y en la pesquería se plantea un modelo de dinámica espacio temporal del stock. Los datos fueron colectados en dos cruceros de prospección realizados a bordo del B/C “Abate Molina”, entre el 4 y 18 de febrero (verano) y el desde el 1 al 14 de septiembre del 2003 (invierno). Los resultados mostraron que la merluza del sur era el...
Tipo: Report
Palavras-chave: Population structure; Stock assessment; Age composition; Biomass; Geographical distribution; Body size; Acoustic equipment; Population structure; Stock assessment; Age composition; Biomass; Geographical distribution; Body size; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_35330.
Ano: 2004
URL: http://hdl.handle.net/1834/1696

Some observations on the African catfish Clarias gariepinus (Burchell) in the Sondu-Miriu River of Lake Victoria, Kenya
Provedor de dados: 20
Autores: Lung'ayia, H.B.O.
The African catfish Clarias gariepinus (Burchell), has an intermitent     occurrence in the Sondu-Miriu river draining into lake Victoria.     Observations were made to get basic information on size composition,     migration, spawning period and food of this species in the river. A     total of 376 fish samples of fish ranging from 11.9 to 101.1 cm in     total length were examined from January to December 1989. A migration     of the fish between the lake and the river waters is indicated. Small     sized and immature fish were available in the river throughout the     year but their numbers became minimal in the dry season. Large and     mature specimens were caught mainly during the high water mark and     rainy seasons of April-June and...
Tipo: Proceedings Paper
Palavras-chave: Clarias gariepinus; Migrations; Population structure; Size distribution; Spawning; Population structure; Spawning; Freshwater catfish; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_14490; Http://aims.fao.org/aos/agrovoc/c_3103.
Ano: 1994
URL: http://hdl.handle.net/1834/1159

Corales, formaciones arrecifales y blanqueamiento de 1987 en Bahía Portete (Guajira, Colombia)
Provedor de dados: 20
Autores: Solano-P., Oscar D.
Para el reconocimiento y caracterización de las formaciones arrecifales de Bahía Pórtete se visitaron un total de 22 estaciones entre junio de 1987 y enero de I988. Se registraron por primera vez Acropora cervicomis, Agaricia agaricites, Montastrea cavernosa, Diploría clivosa e Isophyllia sinuosa, elevando a 18 el número de especies de escleractinios de la bahía. El componente principal por su abundancia y diversidad de formas fue el hidrocoral Millepora alcicomis. Las formaciones arrecifales del área se concentran sobre los costados oeste y suroeste, sin llegar a constituirse en verdaderos arrecifes. Estructuralmente se discriminan dos tipos de formaciones: tipo 1 parches arrecifales y tipo 2 praderas de fanerógamas con colonias dispersas de M. alcicomis....
Tipo: Journal Contribution
Palavras-chave: Bleaching; Ecology; Geographical distribution; Habitat; Population structure; Population dynamics; Turbidity; Density; Species diversity; Ecology; Geographical distribution; Population structure; Turbidity; Bleaching; Population dynamics; Density; Species diversity; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_15043; Http://aims.fao.org/aos/agrovoc/c_953; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_2186; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 1994
URL: http://hdl.handle.net/1834/3782

Pesquerías de pulpos
Provedor de dados: 20
Autores: Re, M.E.
The species composition, population structure, seasonality in catches and fishing of octopuses along the Argentine coast are described from available statistical data and capture samplings. Three species of octopuses, Octopus tehuelchus, Eledone massyae and Enteroctopus megalocyathus are caught. An artisanal intertidal fishery of O.tehuelchus occurs mainly in summer, from November-December to March-April in the North Patagonian coast, especially in the San Matias Gulf, by hooks. E.massyae is caught by coastal trawlers all around the year but mainly in winter and spring in Mar del Plata and Necochea areas. E.megalocyathus is caught by hooks in the intertidal zone and by diving in the subtidal zone, from the North Patagonian gulfs (March to November)to the...
Tipo: Book Section
Palavras-chave: Artisanal fishing; Catch/effort; Cephalopod fisheries; Fishery management; Stock assessment; Population structure; Bottom trawling; Fishery management; Stock assessment; Population structure; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 1998
URL: http://hdl.handle.net/1834/2578

JAMARC-INIDEP joint research cruise on Argentine short-finned squid Illex argentinus. January-March 1997.
Provedor de dados: 20
Autores: Brunetti, N.E.; Ivanovic, M.L.; Rossi, G.R.; Elena, B.; Benavides, H.R.; Guerrero, R.A.; Blanco, G.; Marchetti, C.; Piñero, R.
The distribution, abundance and population structure of Illex argentinus in relation to the oceanographic conditions during summer 1997, were analyzed as a result of the research cruise carried out by R/V Shinko Maru No.3 on the Argentine shelf (39-50°30'S). Besides, abundance and biological features of Ommastrephes bartrami are analyzed. The main activities carried out during the cruise included jigging operations, tagging (only for I. argentinus) and biological sampling. In addition, meteorological and oceanographic data were collected. A total of 30,2000 individuals were tagged and released. The recapture rate was 0.156.  (47 recoveries/30,200 released), considerably higher than that of 1996 (0.030; 4 recoveries/13,191 released). I. argentinus was...
Tipo: Journal Contribution
Palavras-chave: Fishery surveys; Abundance; Population structure; Tagging; Cruise reports; Population structure; Tagging; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_14775.
Ano: 2000
URL: http://hdl.handle.net/1834/2537

Analyse démographique des captures de thon rouge et de la thonine des madragues Tunisiennes
Provedor de dados: 20
Autores: Hattour, A.
The temporal evolution of the demographic structure of bluefin tuna (Thunnus thynnus, Linnaeus 1758) and of the little tuna (Euthynnus alletteratus, Rafinesque 1810) by the Tunisian traps of Sidi Daoud and Monastir is studied during 3 periods (1979-1983; 1988-1992 and 1993-1997). This survey showed the two points of passive capture landing draw the bluefin tuna from two populations of different composition. The fish taken from Tunisian waters do not from a homogenous group of similar beings, since they result from a mixture of local Mediterrean and Atlantic forms. This conclusion was arrived at by Heldt (1929), and confirmed in 2004, by displacement studies indicated that, after reproduction, the adults (&lt;100kg) remained in the Mediterranean, and that,...
Tipo: Journal Contribution
Palavras-chave: Euthynnus alletteratus  Thunnus thynnus; Population structure; Trap nets; Stock identification; Tuna fisheries; Population structure; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2004
URL: http://hdl.handle.net/1834/4235

Preliminary study of age, growth and birthdates of juvenile sardine &lt;Sardina pilchardus&gt; (Walbaum, 1792) and European anchovy Engraulis encrasicolus (Linnaeus, 1758) in the east coast of Tunisia
Provedor de dados: 20
Autores: Khemiri, S.; Gaamour, A.
The microstructures of the otoliths of juvenile sardines (Sardina pilchardus) and anchovies (Engraulis encrasicolus), collected in the East coast of Tunisia, were analyzed in order to estimate age, daily growth and hatch date. The fork length of sardines varied from 48 to 103 mm and estimated age ranged from 105 to 297 days. For the anchovies, the estimated age ranged from 79 to 300 days and the fork length from 42 to 86 mm. The length-age data of both species were fitted to the laird-Gompertz model. The corresponding growth equations were [lt=10.8 exp(2.74(1-exp(-0.006t)))] for sardines and [lt=3.1 exp(3.2(1-exp(-0.02t)))] for anchovies. The instantaneous growth rates of the juvenile of both species in the East of Tunisia were in agreement with the data...
Tipo: Journal Contribution
Palavras-chave: Age determination; Daily; Growth; Hatching; Microstructure; Otoliths; Population structure; Age determination; Growth; Otoliths; Population structure; Hatching; Http://aims.fao.org/aos/agrovoc/c_24110; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_3504.
Ano: 2005
URL: http://hdl.handle.net/1834/3797

Estudio de la estructura de población del mero (Acanthistius brasilianus, Cuvier   Valenciennes); patrones de distribución, biomasa y rendimiento potencial
Provedor de dados: 20
Autores: Di Bussolo, R.A.; Minotti, P.G.
Tipo: Theses and Dissertations
Palavras-chave: Population structure; Potential yield; Biomass; Size distribution.
Ano: 1980
URL: http://hdl.handle.net/1834/4191

Comunidad macroinfaunal de fondos blandos someros tropicales (Caribe colombiano)
Provedor de dados: 20
Autores: Guzmán-Alvis, A.I.; Solano, O.D.; Córdoba-Tejada, M.E.; López-R., A.C.
With the aim to characterize tthe soft-bottom macrofauna and its spatial and temporal distribution patterns in the Santa Marta area, a two years sampling program was performed at depths between 7 to 60 m. Density, biomass and diversity of the community were determined. The BIOENV method was applied in order to relate the distribution of the associations and the environmental variables (depth, turbidity, organic matter, organic carbon, organic nitrogen, organic phosphorus and median particle diameter). A density of 1499 indiv *m-2 and 10.9 g*m-2 wet biomass were obtained. The collected organisms belonged to six taxa: polychaetes, crustaceans, sipunculids, molluscs, bryozoans, and echinoderms; the first one was the most important in terms of abundance and...
Tipo: Journal Contribution
Palavras-chave: Population structure; Population structure; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2001
URL: http://hdl.handle.net/1834/3121

El savorin Seriolella porosa como un recurso estacional en el Golfo San Matias, Argentina
Provedor de dados: 20
Autores: Perier, M.R.; Di Giácomo, E.E.
The San Matias Gulf (Argentine Sea) fishery was historically developed and based on the catching of a target species: the common hake    Merluccius hubbsi. There are also other marketable species such as the savorin Seriolella porosa. The presence of this species in the gulf is characterized by its abundance, population structure and biology. The material used was derived from three information sources: fishing survey cruises, landing samplings and record of the fishing activity.The results obtained allowed to delimit a spawning ground and a nursery area. The relative abundance of the resource showed seasonal variations with the highest values in August. The captured range size was 19-59 cm for females and 19-56 cm for males. The first sexual maturity was...
Tipo: Journal Contribution
Palavras-chave: Population structure; Spawning grounds; Spawning seasons; Abundance; Fishery management; Stock assessment; Population structure; Fishery management; Stock assessment; Spawning grounds; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_7277.
Ano: 2002
URL: http://hdl.handle.net/1834/1701

La fauna íctica en el litoral de la Bahía de San Antonio (Golfo San Matías, Provincia de Río Negro)
Provedor de dados: 20
Autores: Perier, M.R.
La bahía de San Antonio es una zona costera protegida del litoral marítimo que presenta una variada composición faunística (invertebrados, peces, aves y mamíferos). Respecto de la fauna íctica, existe información preliminar que permitió detectar la presencia de especies que presentaban gónadas en estadío de maduración total y se observaron, estacionalmente, ejemplares juveniles de esas y otras especies que motivaron el planteo de las siguientes hipótesis: 1) La bahía San Antonio y la zona de mar adyacente es utilizada por numerosas especies de peces como zona de desove. 2) La bahía San Antonio y la zona de mar adyacente es utilizada por numerosas especies como área de cría y 3) La bahía San Antonio y la zona de mar adyacente es utilizada como zona de...
Tipo: Theses and Dissertations
Palavras-chave: Fishery biology; Fisheries resources; Coastal zone; Ichthyofauna; Spawning grounds; Nursery grounds; Feeding migrations; Environmental conditions; Population structure; Reproduction; Trophic relationships.
Ano: 1994
URL: http://hdl.handle.net/1834/4203

Dinámica de la metapoblación de almeja panopea Panopea abbreviata en los golfos norpatagónicos
Provedor de dados: 20
Autores: Zaidman, P.C.
Panopea abbreviata es el molusco bivalvo infaunal de mayor tamaño del Mar Argentino. Se distribuye desde Río de Janeiro (Brasil) hasta la Patagonia Argentina. En los golfos San Matías (GSM) y San José (GSJ), conforma una metapoblación que presenta una distribución discontinua, formada por una serie de poblaciones ubicadas a lo largo de las costas.Es el bivalvo más longevo explotado en el Atlántico Sur. En el GSM su pesquería comenzó en el año 2000 y, si bien la misma es incipiente, debido a las características biológico-poblacionales de P. abbreviata es un recurso que requiere de un manejo precautorio. Excepto por estudios preliminares sobre el crecimiento y el ciclo reproductivo, no se contaba con la información básica para manejo. El objetivo general del...
Tipo: Theses and Dissertations
Palavras-chave: Fishery biology; Marine molluscs; Population dynamics; Sustainable management; Age; Growth; Mortality rate; Recruitment; Population structure; Spatial variations; Sex composition; Reproductive cycle; Histology; Environmental conditions.
Ano: 2013
URL: http://hdl.handle.net/1834/5236

Etude préliminaire de l'âge et de la croissance de l'espadon &lt;Xiphias gladius&gt; des eaux tunisiennes.
Provedor de dados: 20
Autores: Hattour, A.; Gaamour, A.; Ben Smida, M.A.
Une clé préliminaire âge taille et âge poids est présentée à partir d’un échantillonnage mené sur 212 espadon (Xiphias gladius L.) pêchés le long des côtes tunisiennes entre mars et septembre 2004. les tailles des poissons sont rangées de 60 cm à 173 cm, correspondant à des poids variant de 1,5 kg à 55 kg. L’analyse des coupes de la 2ème épine de la nageoire anale des espadons échantillonnés ont révélé que les âges sont rangés entre 0 et 5 années.
Tipo: Journal Contribution
Palavras-chave: Tuna fisheries; Age; Composition; Weight; Growth; Cosmopolite species; Population structure; Size distribution; Growth; Population structure; Age; Weight; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_186; Http://aims.fao.org/aos/agrovoc/c_8349.
Ano: 2005
URL: http://hdl.handle.net/1834/1535

Evaluación de la pescadilla de red (Cynoscion striatus) en la Zona Común de Pesca argentino-uruguaya, en el otoño de 1989
Provedor de dados: 20
Autores: Cioffi, C.A.
Tipo: Theses and Dissertations
Palavras-chave: Population structure; Biomass; Size distribution; Age; Fishery surveys; Population structure; Biomass; Age; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_186.
Ano: 1992
URL: http://hdl.handle.net/1834/3554

Estrategias de vida de los copépodos Drepanopus forcipatus y Calanus australis en relación con los recursos tróficos en la plataforma patagónica austral (Argentina, 47°- 55°S)
Provedor de dados: 20
Autores: Antacli, J.C.
This Thesis contributes to elucidate the life cycle strategies of two copepod species, the medium-size clausocalanid Drepanopus forcipatus Giesbrecht, 1888 and the large calanid Calanus australis Brodsky, 1959, in relation to the environmental conditions in the southern Patagonian shelf (47°-55°S). This research was mainly carried out with samples collected in late summer/early autumn (March/April, 2004) onboard RV "Dr. E. L. Holmberg" (INIDEP, Mar del Plata). An additional sampling performed during early spring (October, 2005) with RV "Puerto Deseado" (CONICET) was also utilized. The present study was based on the following research questions: 1) Which is the available food for copepod populations by late summer? 2) Which is the relative contribution of...
Tipo: Theses and Dissertations
Palavras-chave: Zooplankton; Trophic levels; Population structure; Hydrography; Community composition.
Ano: 2011
URL: http://hdl.handle.net/1834/4205

Distribución, áreas de concentración y estructura de la población del abadejo (Genypterus blacodes)
Provedor de dados: 20
Autores: Renzi, M.A.
The "abadejo" is one of the species that has been traditionally exploited in the Argentine Sea. Although the capture was not very important, it has been increased in the last years. In this work, the structure of the concentration areas of summer, spring and winter distribution and other biological items were analyzed, basing on the data collected during cruises effected by R/V "Walther Herwing" and R/V "Shinkai Maru" in these waters during 1978/79. Winter and spring distribution patterns showed the highest concentrations located between 41º and 48º SL, specially on the slope. Summer distribution pattern showed the concentration areas located between 43º30' and 48º30' LS shifted rather to the coast when comparing to the previous one. During the winter, in...
Tipo: Theses and Dissertations
Palavras-chave: Geographical distribution; Population structure; Feeding; Length-weight relationships; Stomach content; Diets; Seasonal distribution.
Ano: 1982
URL: http://hdl.handle.net/1834/5028

Calamares omastréfidos (Cephalopoda, Ommastrephidae).
Provedor de dados: 20
Autores: Brunetti, N.E.; Ivanovic, M.L.; Elena, B.
An update of the knowledge on the three most important ommastrephid species that inhabit the SW Atlantic: Illex argentinus, Martialia hyadesi and Ommastrephes bartramii, is presented. Up to the moment, only I.argentinus was intensively studied. Its distribution, population structure, reproduction, growth and paralarval development are analyzed, togheter with other aspects of its biology, such as feeding, predators and parasites. Also its utilization for human consmption is considered. Regarding M.hyadesi and O.bartrami, information on their distribution and biology is presented.
Tipo: Book Section
Palavras-chave: Animal morphology; Geographical distribution; Reproduction; Fecundity; Growth; Feeding; Predators; Parasites; Population structure; Geographical distribution; Growth; Feeding; Predators; Population structure; Animal morphology; Reproduction; Fecundity; Parasites; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_6163; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_421; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_15725; Http://aims.fao.org/aos/agrovoc/c_5574.
Ano: 1998
URL: http://hdl.handle.net/1834/2576

Evaluación de la merluza (Merluccius hubbsi) en julio y agosto de 1994, entre 34º y 36ºS del Atlántico sudoccidental.
Provedor de dados: 20
Autores: Villarino, M.F.; Simonazzi, M.A.; Bambill, G.A.; Ibañez, P.M.; Castrucci, R.; Reta, R.
This report contains the objectives, data collected and results from a hake assessment survey carried out in the Argentine Sea between 34° and 46° S, during July and August 1994, on board of the R/Vs "Dr. E. L. Holmberg" and "Cap. Oca Balda". The main objectives of the survey were: 1) to estimate total biomass and total abundance per age class; 2) to study the size and age composition; 3) to define the maturity ogive per size and age; 4) to quantitatively determine cannibalism and predation indexes. The area covered by the survey where 149 trawls and 184 oceanographic stations were performed was close to 100,440 nm2 . Hake biomass between 34° and 46° S was estimated in 1,105,284 tons and the confidence interval at 95.  was ± 23.12. . Most of the biomass...
Tipo: Journal Contribution
Palavras-chave: Stock assessment; Abundance; Biomass; Fishery surveys; Population structure; Stock assessment; Biomass; Population structure; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2000
URL: http://hdl.handle.net/1834/2591

Evaluación hidroacústica del stock parental de merluza de tres aletas en su unidad de pesquería, año 2003. Informe final corregido
Provedor de dados: 20
Autores: Lillo, S.; Céspedes, R.; Díaz, E.; Ojeda, V.
El presente estudio tiene como objetivo evaluar el stock de merluza de tres aletas (Micromesistius australis) a través del método hidroacústico, entre las latitudes 47º y 51º Sur. Como parte del proyecto, se realizó entre el 2 y el 15 de agosto del 2003 a bordo del B/C “Abate Molina” un crucero de prospección dirigido a evaluar mediante un método de evaluación directa (evaluación acústica) su biomasa, abundancia y distribución, estimar la importancia relativa de la fauna acompañante, condiciones reproductivas y tróficas del stock. Durante el estudio se realizaron 13 lances de pesca y 49 transectas acústicas. Los resultados muestran que la merluza de tres aletas se distribuyó asociada al borde de la plataforma y talud continental, con una biomasa estimada...
Tipo: Report
Palavras-chave: Stock assessment; Biomass; Population structure; Age composition; Geographical distribution; Acoustic equipment; Stock assessment; Biomass; Population structure; Age composition; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_5083.
Ano: 2004
URL: http://hdl.handle.net/1834/1698

Estructura y abundancia del stock reproductor del abadejo (Genypterus blacodes) del Mar Argentino en el período 1995-2000
Provedor de dados: 20
Autores: Cordo, H.D.
The structure and abundance of Ling spawning stock were analized from basic biological and oceanographic data recorded during research surveys carried out by INIDEP between 1995 and 2000, to assess the juveniles fraction of common hake stock (January) and of Argentine patagonian squid (February). Jointly both surveys covered the main spawning area of Ling between 44º S and 48º S and approximately between the mouth of San Jorge Gulf (60º W) and 200 m isobath (65º 30’ W) during the summer season (mid-December to mid-March). Size structures and maturity stages confirmed the presence of a spawning unit in the area covered by the surveys. This enabled the estimate of an annual index of Ling spawning stock abundance. Abundance shows a decreasing trend since...
Tipo: Journal Contribution
Palavras-chave: Spawning grounds; Fishery surveys; Population structure; Gadoid fisheries; Population structure; Spawning grounds; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_7277.
Ano: 2006
URL: http://hdl.handle.net/1834/1568

Distribución estacional y estructura poblacional del bacalao austral (Pisces, Moridae, Salilota australis) en la zona económica exclusiva argentina entre los 45°S y 56°S durante 1992 y 1993
Provedor de dados: 20
Autores: Cassia, M.C.; Hansen, J.E.
The Patagonian cod (Salilota australis) inhabits the SW Atlantic from 38°S up to 55°S, as well as the Pacific Ocean from 40°S up to 57°S. The annual catches of this species by both the Argentine fleet and those operating around the Malvinas Islands have significantly increased during the decade 1990-2000, peaking to 16,556 t in 1996. After this, a marked decrease in landings was noticed, and during 2003 the catch was 7,924 t. Seasonal distribution, concentration grounds, and population structure of the Patagonian cod from the Argentine Sea are described, and the mean densities of the species are seasonally related to latitude, temperature and depth, on the basis of data from surveys carried out by the INIDEP research vessels in 1992 and 1993. Highest mean...
Tipo: Journal Contribution
Palavras-chave: Gadoid fisheries; Seasonal distribution; Population density; Population structure; Biomass; Population structure; Biomass; Population density; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 2005
URL: http://hdl.handle.net/1834/1561

Características estructurales y funcionales del Manglar de Avicennia germinans en la Bahía de Chengue (Caribe colombiano)
Provedor de dados: 20
Autores: Rodríguez-Ramírez, A.; Nivia-Ruíz, J.; Garzón-Ferreira, J.
Within the framework of the CARICOMP(Caribbean Coastal Marine Productivity) monitoring program, a study of the Avicennia germinans mangrove formation of Chengue bay (Tayrona Natural Park, Colombia) was performed between June 1995 and July 1996, based on the evaluation of structural and functional characteristics at three monitoring plots (10 x 10 m). The structure of the studied formation is coincident with that of fringing forests of the Caribbean region in having small trees (dbh=11.3 cm, total height=6.3 m) and high densities (16.3 trunks/0.01 ha). During the monitored period there was a low mortality rate (0.7 trees/year) and there were significant increases of the circumferences at breast height (as well as of the variables derived from this measure)....
Tipo: Journal Contribution
Palavras-chave: Population structure; Growth; Mangroves; Population structure; Growth; Mangroves; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_16190.
Ano: 2004
URL: http://hdl.handle.net/1834/3081

Aspectos económicos de la pesquería de caballa (Scomber japonicus) y muestreo de desembarque en el puerto de Mar del Plata.
Provedor de dados: 20
Autores: Perrotta, R.G.; Tringali, L.S.; Izzo, A.; Boccanfuso, J.; López, F.; Macchi, G.J.
Movements pattern records of the Mar del Plata inshore fishing fleet during the 1997/98 and 1998/99 chub mackerel fishing seasons (October-January) allowed to observe that there is coincidence between the decrease of the 1983-1997 catches with respect to years previous to the 1975/76 "critical season" and a reduction of the inshore fleet fishing grounds which modifies accessibility of the fleet to the chub mackerel schools. Biostatistical and gonadal development results obtained in the Mar del Plata area (i.e., presence of adults during almost the whole fishing season which overlaps with the spawning season) do not differ significantly from those obtained during previous fishing seasons. As recommended in previous papers, chub mackerel fishing operations...
Tipo: Journal Contribution
Palavras-chave: Catch statistics; Biological sampling; Fishing grounds; Population structure; Costs; Population structure; Fishing grounds; Costs; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_2947; Http://aims.fao.org/aos/agrovoc/c_1922.
Ano: 2000
URL: http://hdl.handle.net/1834/2542

La pesquería de besugo (Pagrus pagrus). Análisis de las capturas, esfuerzo nominal y estructura de los desembarques en 2011
Provedor de dados: 20
Autores: García, S.
Red porgy (Pagrus pagrus) fishery. Analysis of catches, nominal effort and landings structure in 2011. A descriptive analysis of red porgy (Pagrus pagrus) fishery within the Buenos Aires Coastal Ecosystem (BCE) and the Argentine continental shelf, between 34° S and 42° S, during 2011 was performed. The catches landed, of a total of 3,627 t, performed in a direct and incidental way by an heterogeneous fleet of 149 vessels belonging to five strata (Ia, Ib, Ic, IIa and IIb) in 1,527 fishing trips represented a 36.7% decrease as regards 2010. The spatiotemporal analysis allowed to determine that the highest yields of the species were obtained close to 50 m depth, that coincides with the highest surface temperatures in the area, that decrease in a...
Tipo: Journal Contribution
Palavras-chave: Catch/effort; Landing statistics; Population structure; Coastal fisheries.
Ano: 2013
URL: http://hdl.handle.net/1834/5509

Caracterización ecológica de la salina artificial Pozos colorados, Caribe colombiano
Provedor de dados: 20
Autores: Mancera-P., J.E.
Un estudio ecológico de la salina marina Pozos Colorados se llevó a cabo entre enero y agosto de 1987. Si bien las dos estaciones de muestreo presentaron amplias diferencias entre si; en general la dinámica del ecosistema dependió aparentemente de la salinidad, la cual varió entre 75 y 341 °/oo; su incremento y la disminución del nivel de agua, al parecer generaron aumento de la temperatura y disminución del oxígeno disuelto, con rangos de 26,3 y 41 °C para la primera y O y 5,4 mg/l para el segundo. Aunque en promedio el pH fue neutro (7,5), este sistema reductor, caracterizado además por abundante materia orgánica, generó en ocasiones una ligera acidez (6,7). La producción primaria neta fue negativa en la mayoría de los casos, como resultado de una...
Tipo: Journal Contribution
Palavras-chave: Salinity effects; Ecosystems; Temperature effects; Primary production; Population structure; Ecology; Ecosystems; Primary production; Population structure; Ecology; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_34329; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_2467.
Ano: 1990
URL: http://hdl.handle.net/1834/3887

Aspectos biológicos del calamar Illex argentinus
Provedor de dados: 20
Autores: Leta, H.R.
La creciente importancia que los recursos de calamar han adquirido en 105 últimos 30 años, los sitúa actualmente entre los más importantes recursos pesqueros del mundo. En consecuencia, paises tradicionalmente no explotadores o consumidores de productos de calamar, han orientado sus esfuerzos hacia el logro de un mejor conocimiento de las especies de cefalópodos que habitan su ambiente marino. En este sentido el aporte de disciplinas tales como la biología ha sido decisivo para desarrollar en forma exitosa pesquerías de calamar, entre otras.El programa de investigaciones del Instituto Nacional de Pesca para 1980 incluyó el estudio integral de la explotación de los calamares como un primer paso hacia el desarrollo de una pesquería del recurso.  Este trabajo...
Tipo: Report
Palavras-chave: Biology; Environmental conditions; Population structure; Spawning; Spawning grounds; Sex ratio; Sexual maturity; Reproduction; Length; Behaviour; Migrations; Growth; Population structure; Spawning; Length; Growth; Biology; Environmental conditions; Spawning grounds; Sex ratio; Sexual maturity; Reproduction; Behaviour; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_14490; Http://aims.fao.org/aos/agrovoc/c_4260; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_925; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_7277; Http://aims.fao.org/aos/agrovoc/c_7014; Http://aims.fao.org/aos/agrovoc/c_7016; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_868.
Ano: 1981
URL: http://hdl.handle.net/1834/2563

Etude préliminaire de l’age et de la croissance de l’espadon (&lt;Xiphias gladius&gt;) des eaux Tunisiennes
Provedor de dados: 20
Autores: Hattour, A.; Gaamour, A.; Ben Smida, M.A.
Une clé préliminaire âge taille et âge poids est présentée à partir d’un échantillonnage mené sur 212 espadon (Xiphias gladius L.) pêchés le long des côtes tunisiennes entre mars et septembre 2004. les tailles des poissons sont rangées de 60 cm à 173 cm, correspondant à des poids variant de 1,5 kg à 55 kg. L’analyse des coupes de la 2ème épine de la nageoire anale des espadons échantillonnés ont révélé que les âges sont rangés entre 0 et 5 années.
Tipo: Journal Contribution
Palavras-chave: Age composition; Cosmopolite species; Growth; Length; Size distribution; Tuna fisheries; Weight; Population structure; Age composition; Growth; Length; Population structure; Weight; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_4260; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_8349.
Ano: 2005
URL: http://hdl.handle.net/1834/3737

Avances en métodos y tecnología aplicados a la investigación pesquera. Seminario final del Proyecto INIDEP-JICA sobre evaluación y monitoreo de recursos pesqueros 1994-1999
Provedor de dados: 20
The Seminar organized by the Japan International Cooperation Agency (JICA) and the National Institute for Fisheries Research and Development (INIDEP) of Argentina, was held at INIDEP, Mar del Plata from September 6-9, 1999. The publication comprises expanded abstracts of each presentation, in four Theme Sessions: Reproduction and Survival, Age and Growth, Stock Identifcation and Resource Management Techniques and Relation between Oceanographic and Fishing Conditions. Presentations focused mainly on the following marine resources: squids Illex argentinus and Loligo sanpaulensis; and fish species southern blue whiting Micromesistius australis, patagonian hoki Macruronus magellanicus, kingklip Genypterus blacodes,  patagonian toothfish Dissostichus...
Tipo: Book
Palavras-chave: International cooperation; Research programmes; Fishery resources; Reproduction; Survival; Growth; Age determination; Fishery management; Population structure; Stock identification; Mesh selectivity; Satellite sensing.
Ano: 1999
URL: http://hdl.handle.net/1834/5510

Conocimiento biológico pesquero del recurso merluza (Merluccius hubbsi) y su pesquería en la República Argentina.
Provedor de dados: 20
Autores: Bezzi, S.I.; Dato, C.V.
This paper summarizes the present knowledge on Merluccius hubbsi and its fishery in Argentina, based on the model proposed by the Technical Secretary of Comisión Técnica Mixta del Frente Marítimo, in 1990. It includes the taxonomic location of the species, its geographical distribution, stock unity, structure and population dynamics. It describes the fishing gear and fishing operations and presents the available information on selectivity and discards. The paper shows the data landings separated by fleet. Exploitation regulatory measures in force are included.
Tipo: Journal Contribution
Palavras-chave: Gadoid fisheries; Population dynamics; Stock assessment; Mortality; Population structure; Fishery management; Landing statistics; Parasites; Stock assessment; Population structure; Fishery management; Mortality; Parasites; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_4945; Http://aims.fao.org/aos/agrovoc/c_5574; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 1995
URL: http://hdl.handle.net/1834/2558

Dinámica y estructura poblacional del langostino colorado III y IV regiones. Informe Final, FIP n° 2005 -41
Provedor de dados: 20
Autores: Quiroz, J.C.; Montenegro, C.; Báez, P.; Espíndola, F.
Se reportan las actividades y resultados del proyecto FIP 2005-41 “Dinámica y estructura  poblacional del langostino colorado III y IV Regiones”. Para abordar el estudio de la dinámica y estructura poblacional de P. monodon, se plantearon dos hipótesis. Una postula que la especie posee una estructura poblacional a lo largo de la plataforma continental, en un gradiente latitudinal, en tanto que la otra plantea que la especie tiene una estructura poblacional a través de la plataforma continental, en un gradiente longitudinal. Para someter a pruebas estas hipótesis se realizaron varios análisis estadísticos de variables fundamentales del stock, como la densidad, los tamaños corporales, las edades y componentes del stock en función de su madurez. Los...
Tipo: Report
Palavras-chave: Population dynamics; Population structure; Size distribution; Spawning populations; Statistical models; Marine crustaceans; Population structure; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2006
URL: http://hdl.handle.net/1834/1505

Resultados de la campaña de evaluación de peces demersales australes efectuada en el verano de 1997.
Provedor de dados: 20
Autores: Wöhler, O.C.; Giussi, A.R.; García de la Rosa, S.B.; Sánchez, M.F.; Hansen, J.E.; Cordo, H.D.; Alvarez Colombo, G.L.; Incorvaia, I.S.; Reta, R.; Abachián, V.E.
An assessment survey on the austral fish was carried out during the summer 1997 on both the shelf and slope off southern Argentina. The cruise covered 101,508 nm2 between 45° and 54° 30'S and depths between 50 and 400 m. The survey did not include the area controlled by the United Kingdom. Considering the total area as an undivided stratum, a random sampling was used to estimate demersal fish biomass and a delta distribution-based model to evaluate mean densities. Out of the forty five species caught 28 were bony fish and 17 elasmobranch. Four cephalopod mollusc species were also identified. A biomass of 3.2 million tons (CI(95o/o): 1.90 - 6.06 millions) proved that longtail hake was the most abundant resource within the region followed by common hake...
Tipo: Journal Contribution
Palavras-chave: Demersal fisheries; Fishery surveys; Biomass; Population structure; Feeding; Parasitism; Environmental conditions.
Ano: 1999
URL: http://hdl.handle.net/1834/5782

Genetic characterization of the Moxotó goat breed using RAPD markers
Provedor de dados: 86
Autores: Oliveira,Rejane Rodrigues de; Egito,Andréa Alves do; Ribeiro,Maria Norma; Paiva,Samuel Rezende; Albuquerque,Maria do Socorro Maués; Castro,Silvia Ribeiro; Mariante,Arthur da Silva; Adrião,Manuel.
The objective of this study was to verify the genetic diversity between and within seven populations of Moxotó goat (n = 264) from the States of Pernambuco, Paraíba and Rio Grande do Norte, using RAPD (Random Amplified Polymorphic DNA). Moxotó, as well as other naturalized breeds, suffers genetic losses due to the indiscriminate miscegenation with breeds raised in the Northeast Region of Brazil. The genetic characterization of these genetic resources is essential to conservation and breeding programs. DNA was extracted from lymphocytes using a non-organic protocol. The 16 primers used were selected from 120 decamer oligonucleotide primers and generated 56 polymorphic bands. The analysis of molecular variance (AMOVA) showed that the greater part of total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capra hircus; Native breeds; Population structure; Conservation genetics.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000300006

Genetic associations in the detection of QTLs for wheat spike-related traits
Provedor de dados: 86
Autores: Brbaklić,Ljiljana; Trkulja,Dragana; Kondić-Špika,Ankica; Hristov,Nikola; Denčić,Srbislav; Mikić,Sanja; Tomičić,Marina; Kobiljski,Borislav.
The objective of this work was to assess the genetic diversity and population structure of wheat genotypes, to detect significant and stable genetic associations, as well as to evaluate the efficiency of statistical models to identify chromosome regions responsible for the expression of spike-related traits. Eight important spike characteristics were measured during five growing seasons in Serbia. A set of 30 microsatellite markers positioned near important agronomic loci was used to evaluate genetic diversity, resulting in a total of 349 alleles. The marker-trait associations were analyzed using the general linear and mixed linear models. The results obtained for number of allelic variants per locus (11.5), average polymorphic information content value...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Genetic resources; Microsatellites; Population structure; Spike-related traits.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000200149

Distinct genetic structure in populations of Chrysoperla externa (Hagen) (Neuroptera, Chrysopidae) shown by genetic markers ISSR and COI gene
Provedor de dados: 92
Autores: Barbosa,Nara C. C. P.; Freitas,Sérgio de; Morales,Adriana C.
Distinct genetic structure in populations of Chrysoperla externa (Hagen) (Neuroptera, Chrysopidae) shown by genetic markers ISSR and COI gene. Green lacewings are generalist predators, and the species Chrysoperla externa presents a great potential for use in biological control of agricultural pests due to its high predation and reproduction capacities, as well as its easy mass rearing in the laboratory. The adaptive success of a species is related to genetic variability, so that population genetic studies are extremely important in order to maximize success of the biological control. Thus, the present study used nuclear (Inter Simple Sequence Repeat - ISSR) and mitochondrial (Cytochrome Oxidase I - COI) molecular markers to estimate the genetic variability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic distance; Green lacewings; Insecta; Population structure; Variability.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262014000200012

POPULATION GENETIC ANALYSIS OF BRAZILIAN PEACH BREEDING GERMPLASM
Provedor de dados: 94
Autores: THUROW,LIANE BAHR; RASEIRA,MARIA DO CARMO BASSOLS; BONOW,SANDRO; ARGE,LUIS WILLIAN PACHECO; CASTRO,CAROLINE MARQUES.
ABSTRACT  Peach has great economic and social importance in Brazil. Diverse sources of germplasm were used to introduce desirable traits in the Brazilian peach breeding pool, composed mainly by local selections and accessions selected from populations developed by the national breeding programs, adapted to subtropical climate, with low chill requirement, as well as accessions introduced from several countries. In this research, we used SSR markers, selected by their high level of polymorphism, to access genetic diversity and population structure of a set composed by 204 peach selected genotypes, based on contrasting phenotypes for valuable traits in peach breeding. A total of 80 alleles were obtained, giving an average of eight alleles per locus. In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus persica; Genetic diversity; Population structure; Low chill germplasm; Genetic resources.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000500802

Population biology of the burrowing crab Neohelice granulata, (Crustacea: Decapoda: Varunidae) from a tropical mangrove in Brazil
Provedor de dados: 103
Autores: Gregati,Rafael A.; Negreiros-Fransozo,Maria L.
The population biology of the burrowing crab Neohelice granulata (Dana, 1851) from a mangrove in Jabaquara Beach, Paraty, state of Rio de Janeiro, Brazil (23º13'04"S and 44º42'47"W), was studied with respect to the following traits: size-frequency distribution, recruitment, reproductive period, fecundity, and sex ratio. Specimens were sampled monthly from April, 2003 to March, 2004, at the river margins during low tide periods. Size, sex, presence of eggs, and stage of the female gonad were recorded. Ovigerous females had their eggs removed and counted. The reproductive period was continuous and the highest frequency of ovigerous females was recorded in the fall and winter. Mature gonads were found throughout the year and recruitment was continuous but...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grapsoidea; Population structure; Semiterrestrial crab.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000100006

Biological information of Taunayia bifasciata (Siluriformes: Heptapteridae): a threatened and unknown catfish
Provedor de dados: 103
Autores: Rondineli,Giulianna; Carmassi,Alberto Luciano; Braga,Francisco Manoel de Souza.
Taunayia bifasciata (Eigenmann &amp;amp; Norris, 1900) is a small catfish that inhabits headwater streams of the Tietê and Paraíba do Sul river basins, southeastern Brazil, being restricted to the Atlantic rain forest. The species is found on lists of threatened species of Brazil and the state of São Paulo. Despite that, there is no literature information about the biology of the species. In the present study we endeavored to collect data on the biology of T. bifasciata. A total of 37 specimens were captured in two streams, Piracuama and Oliveiras. Of those, 22 were females, 14 were males and 1 specimen was immature. Adults with mature gonads were captured in all samples excepting the last, suggesting that T. bifasciata has a long reproductive season. The...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Diet; Fecundity; Population structure; Reproductive season; Eastern Serra da Mantiqueira.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000400018

Pedigree analysis on the population of Gir cattle in Northeast Brazil
Provedor de dados: 96
Autores: Oliveira,Aracele Prates de; Malhado,Carlos Henrique Mendes; Carneiro,Paulo Luiz Souza; Martins Filho,Raimundo; Silveira,Éderson Silva; Souza,Laaina de Andrade; Muniz,Lorena Mirelle Santos; Azevêdo,Danielle Maria Machado Ribeiro.
The objective of this study was to characterize the population genetic structure of the Gir breed in the Northeast of Brazil. The data used in this study were taken from pedigree information of 8,897 Gir animals between 1957 and 2007, obtained from the Brazilian Zebu Breeders Association (ABCZ). The program ENDOG was used to estimate the parameters based on the probability gene origin. From the amount of the studied animals, 67.22%, 18.41% and 3.15% had complete pedigree only on the first, second and third parentage, respectively. The number of ancestors that contributed for the reference population was 2,755, of which only 171 explain the 50% genetic variability of the population. The actual number of founder herds was 168 and the effective number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ancestry; Inbreeding; Population structure.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000500011

Karyotypic polymorphism and evolution within and between the Liolaemus monticola (Iguanidae) "northern 2n = 38-40" chromosome race populations in central Chile
Provedor de dados: 97
Autores: LAMBOROT,MADELEINE.
Chromosomal genotypes were scored from 359 Liolaemus monticola lizards of the "northern, 2n = 38-40" chromosomal race from 21 locality samples between the Maipo (and one of its tributaries) and the Aconcagua (and one of its tributaries) ribers, plus a sample from the interracial hybridization zone, and some representative locality samples of the "southern 2n = 34" and the "multiple fission 2n = 42-44" chromosomal races for comparisons. The first seven variable chromosomal pairs were coded as Mendelian genotypes and statistically summarized by several clustering and population genetic algorithms. Spatial and temporal differentiation was assessed by chromosome frequencies, chromosomal diversity and heterozygosity. While no differentiation was found for...
Tipo: Journal article
Palavras-chave: Iguanidae; Liolaernus monticola; Chromosomal races; "northern 2n = 38-40" chromosomal race; Population structure; Speciation.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000017

Population genomics and gene introgression in goat herds naturally adapted to Brazil
Provedor de dados: 124
Autores: Moura,Jeane de Oliveira; Campelo,José Elivalto Guimarães; Bajay,Miklos Maximiliano; Sarmento,José Lindenberg Rocha; Araújo,Adriana Mello de.
ABSTRACT The aim of this study was to apply the Illumina 50 K goat SNP Chip to analyse population genomic structure in two herds of Marota goats in the State of Piauí, one private and the other an official conservation herd, and to investigate evidence of genetic erosion in these herds caused by the Anglo-Nubian goat. To that end, 86 Marota and 10 Anglo-Nubian animals were genotyped. Genetic diversity was analysed by comparing minor allele frequency (MAF) in the herds. Population structure and genetic differentiation were evaluated using a Bayesian approach, principal component analysis (PCA) and the fixation index (FST). High genetic differentiation (FST = 0.16) was seen in the Marota population in relation to the Anglo-Nubian. The private herd shared a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SNP chip; Population structure; Genetic resources.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000300476

Variance additivity of genetic populational parameter estimates obtained through bootstrapping
Provedor de dados: 63
Autores: Carlini-Garcia,Luciana Aparecida; Vencovsky,Roland; Coelho,Alexandre Siqueira Guedes.
Studying the genetic structure of natural populations is very important for conservation and use of the genetic variability available in nature. This research is related to genetic population structure analysis using real and simulated molecular data. To obtain variance estimates of pertinent parameters, the bootstrap resampling procedure was applied over different sampling units, namely: individuals within populations (I), populations (P), and individuals and populations simultaneously (I, P). The considered parameters were: the total fixation index (F or F IT), the fixation index within populations (f or F IS) and the divergence among populations or intrapopulation coancestry (theta or F ST). The aim of this research was to verify if the variance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population structure; Resampling; Molecular markers; Natural populations; Simulation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100015

ความหลากหลายทางพันธุกรรมและโครงสร้างประชากรของข้าววัชพืชในประเทศไทย
Provedor de dados: 106
Autores: Anupong Wongtamee; Chanya Maneechote; Benjavan Rerkkasem; Sansanee Jamjod.
Weedy rice (Oryza sativa f. spontanea) is one of most serious weeds in direct-seeded rice production. High genetic diversity and adaptability of weedy rice made it very difficult to control in the rice field. This study aim to assess genetic diversity and population structure of weedy rice populations from Lower North, Northeast and Central of Thailand in wet of 2009 using twelve microsatellite markers. Genetic diversity and population structure of weedy rice were determined and compared with seven common wild rice populations and seven check varieties commonly grown in these regions. Weedy rice populations in this present study were hybrid between common wild rice and crop rice. The population structure of them was structured into 2 clusters according to...
Tipo: Collection
Palavras-chave: Weedy rice; Genetic diversity; Population structure; Gene flow; ข้าววัชพืช; ความหลากหลายทางพันธุกรรม; โครงสร้างประชากร; การแลกเปลี่ยนยีน; ประเทศไทย.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5333

Population biology of spine shrimp Exhippolysmata oplophoroides (Holthuis) (Caridea, Hippolytidae) in a subtropical region, São Paulo, Brazil
Provedor de dados: 104
Autores: Fransozo,Vivian; Costa,Rogério C.; Bertini,Giovana; Cobo,Valter J.
The population biology of Exhippolysmata oplophoroides (Holthuis, 1948) was studied in Ubatuba Bay (23º26'S, 45º02'W), Ubatuba, São Paulo, Brazil, from September/1995 to August/1996. Each sampling comprised eight transects (14 000 m² each), sampled monthly with three repetitions. The specimens were classified with respect to the presence or absence of eggs in the abdominal appendages. Spine-shrimps occurred only on six transects, being most abundant on transect II, with the highest incidence in late spring and throughout the summer months. Ovigerous and non-ovigerous shrimps were present year-round, in an approximately similar proportion (1:1). Site II in Ubatuba Bay is characterized by high salinity and oxygen values, temperature between 26 and 29ºC, low...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Distribution; Population structure; Reproduction; Southeastern Brazil; Spine shrimp.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752005000400037

Estrutura populacional de Portunus spinimanus Latreille (Crustacea, Portunidae) na Armação do Itapocoroy, Penha, Santa Catarina, Brasil
Provedor de dados: 104
Autores: Branco,Joaquim Olinto; Lunardon-Branco,Maria José; Souto,Flávio Xavier.
Portunus spinimanus Latreille, 1819 is one abundant Portunidae speeies whieh are eaught by sea-bob-shrimps artisanal fishery in Armaçãodo Itapoeoroy,Penha, Santa Catarina, Brazil. Aiming to analyze its population strueture, a total of 995 males and 1925 fernaleswere eollected by means of overtrawl frorn January to Decernber 1995, between the depthsof 610 10meters,in lhe periodsof morning,afternoonand evening. The width variation of lhe carapaee ranged írom 3.0 to 14.0 em in the males and 3.0 to 11.0emin females. The species presents growth isometric and the males reach width and weight assintoticand bigger that lhe females.The estirnatedfirst maturation width was between 6.8 and 7.6 em, reached with lhe approxirnated age of 15 months. The artisanal fishery...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Portunus spinimanus; Population structure; Artisanal fishery.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000300010

Population biology of the hermit crab Petrochirus diogenes (Linnaeus) (Crustacea, Decapoda) in Southern Brazil
Provedor de dados: 104
Autores: Turra,Alexander; Branco,Joaquim Olinto; Souto,Flávio Xavier.
The aim of this study was to provide information on the biology of a subtropical population ofthe hermit crab Petrochirus diogenes focusing size structure, sex ratio, reproductive period and morphometric relationships. Monthly samples were done between January and December 1995 at Armação of Itapocoroy, Penha, southern Brazil, using two over-trawls in depths from 6.0 to 10.0 m. A total of 126 individuais were collected. Overall sex ratio did not differ from 1:1. When the sex ratio was analyzed for each size class, it was skewed for females in the smallest size classes while males outnumbered females in the largest ones. The mean size (cephalothoracic length) of P. diogenes was 30.61 ± 12.52 mm and the size structure of this population was skewed to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Size distribution; Population structure; Sex ratio; Morphometric relationships; Reproductive activity.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000400008

Biologia populacional de Emerita brasiliensis Schmitt (Crustacea, Hippidae) na Praia Vermelha do Norte, Ubatuba (São Paulo, Brasil)
Provedor de dados: 104
Autores: Nakagaki,Jelly Makoto; Pinheiro,Marcelo Antonio Amaro.
Emerita brasiliensis Schmitt, 1935 is a common mole crab called "tatuíra" in Brazil, with distribution from Espírito-Santo State (Brazil) to Buenos Aires Province (Argentina). Specimens were collected bimonthly from May/1992 through March/1993 with 4mm siffers mesh, in the intertidal region at Vermelha do Norte Beach, Ubatuba, São Paulo, Brazil. The animals were sexed and measured with a precision caliper of 0.1 mm (Cl = carapace length). Males presented cl amplitude from 3.4-17.3mm (13.2±2.1mm), and females from 13.8-26.3mm (20.5±1.8mm), showing a well-defined sexual dimorfism for this variable. The population presented a smaller incidence of males in relation to females (0.54:1.00), however in May/1992 an inverse pattern occurred (1.84:1.00). Ovigerous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hippidae; Emerita brasiliensis; Population structure; Sex-ratio.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000600010

Distribuição de densidade e estrutura populacional de Pilumnus dasypodus Kingsley (Crustacea, Decapoda, Xanthidae) na Ilha do Farol, Matinhos, Paraná, Brasil
Provedor de dados: 104
Autores: Bosa,Cláudia Regina; Masunari,Setuko.
A study of the population of the xanthid crab Pilumnus dasypodus Kingsley, 1879 from rocky shore at the Farol Isle (25º51'S and 48º32'W) was carried out in the following aspects: temporal and spatial distributions of density, annual fluctuation of the sex ratio, size composition of the population and reproductive activities of the species. Monthly, four leveis in relation to emmersion time within intertidal zone were sampled, from May/90 to April/91, but Pilumnus dasypodus was obtained only in the levels 2, 3 and 4. The surface water temperature ranged from 16.0ºC (July/90) to 28.0ºC (February/91). A total of 775 individuais of Pilumnus dasypodus were collected among which, 92 were ovigerous females. The population density ranged from 14.63 ind.m-3...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pilumnus dasypodus; Population structure; Farol Isle; Paraná State.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000400016

Estrutura populacional, aspectos da reprodução e alimentação dos Cyprinodontiformes (Osteichthyes) de um riacho do sudeste do Brasil
Provedor de dados: 104
Autores: Aranha,José Marcelo Rocha; Caramaschi,Érica Pellegrini.
The population structure, reproductive aspects and feeding of Phalloceros caudimaculatus (Hensel, 1868), Poecilia vivipara Bloch &amp;amp; Schneider (1801), Phalloptychus januarius (Hensel, 1868) e Jenynsia lineata (Jenyns, 1842) were studied in five sampling stations in the Ubatiba stream, municipality of Maricá (State of Rio de Janeiro, Brazil). In relation to the population structure, P. caudimaculatus was more representative upstream; P. vivipara mid-stream and downstream; P. januarius and J. lineata downstream. The species presented preponderance of females, except in the intermediate length classes. The occurence of imatures and females with young pointed out a long reproductive period and favoured areas for reproduction of the four species. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyprinodontiformes; Population structure; Feeding; Reproduction; Coastal stream.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000300005

Aspectos reprodutivos do cangati, Parauchenipterus galeatus Linnaeus (Osteichthyes, Auchenipteridae) da Lagoa de Extremoz, Rio Grande do Norte, Brasil
Provedor de dados: 104
Autores: Medeiros,Ana Patrícia T. de; Chellappa,Naithirithi T.; Chellappa,Sathyabama.
The Lake Extremoz is one of the three big lakes in the State of Rio Grande do Norte. The present work was carried out in this lake during the period of October 2000 to September 2001, which included the dry and the rainy seasons. Parauchenipterus galeatus Linnaeus, 1766 represent 10% of the commercially important species captured from this lake. Fish samples were collected on a monthly basis, besides registering the rainfall, temperature, and dissolved oxygen of the lake. The populational structure of cangati and the stage of maturation of the gonads were determined, besides the gonadosomatic relation. The results indicate that the study population presented higher mean values of total length and weight during the dry season. Mature fishes were caught...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gonadal maturation; Gonadosomatic relation; Population structure; Reproductive season.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000400015

Estrutura populacional de Petrolisthes armatus (Gibbes) (Decapoda, Anomura, Porcellanidae) da Ilha do Farol, Matinhos, Paraná, Brasil
Provedor de dados: 104
Autores: Oliveira,Edinulva; Masunari,Setuko.
Population structure of the porcelain crab Petrolisthes armatus (Gibbes, 1850) from the rocky shore of the Farol isle (25º51'S, 48º32'W) was carried out in the following aspects: annual fluctuation of the density, distribution of the developmental stages and sexes over year round, size composition and recruiting period of juveniles into the population. Monthly collections were made in the three sites of the midlittoral, from November/89 to April/91, with the aid of a trap. The air temperature ranged from 13ºC to 28ºC, that of the surface water from 16ºC lo 29ºC and the salinity of the surface water from 06.7‰ to 31.5‰. A total of 5.585 individuals of Petrolisthes armatus was collected, among which, 116 were in the megalopa stage, 1,579 juveniles, 830...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crustacea; Petrolisthes armatus; Population structure; Farol Isle; Paraná; Brazil.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000200014

Bioecology of the crab Ucides cordatus (Crustacea, Decapoda) in mangroves influenced by the Amazon River, Brazil
Provedor de dados: 36
Autores: Amaral,Kárlia Dalla Santa; Vieira,Inácia Maria; Osório,Frederico Moreira; Rocha,Joana D'arc Mauricio; Lima,Jô de Farias.
The mangrove crab (Ucides cordatus) is a valuable fishery resource, overfished along the Brazilian coast. This study aimed to obtain bioecological data on this crab along the coast of the State of Amapá. Six bimonthly samplings were conducted between December 2008 and January 2010. Transects were used to estimate the density (burrows m-2) and population abundance (individuals m-2). All the animals were subjected to biometrics, with females being classified according to their stage of gonadal maturation. The mean density (1.09 burrows m-2) and abundance (0.31 individuals m-2) were influenced by the climate with the highest values in summer (1.17 burrows m-2 and 0.34 individuals m-2). The male to female ratio was 1.38:1 showing significant difference in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: State of Amapá; Reproductive dynamics; Population structure; Fishery resource.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000200007

Phytophthora infestans POPULATION STRUCTURE: A WORLDWIDE SCALE
Provedor de dados: 37
Autores: CÁRDENAS,MARTHA; DANIES,GIOVANNA; TABIMA,JAVIER; BERNAL,ADRIANA; RESTREPO,SILVIA.
Phytophthora infestans, the causal agent of late blight disease in potato and other members of the Solanaceae family, is responsible for causing the Irish potato famine and, even today, it causes enormous economic losses all over the world. For the establishment of an adequate pest management strategy, the determination of the pathogen's population structure is required. To characterize P. infestans populations worldwide two allozymes, Gpi (Glucose-6-phospate isomerase) and Pep ( Pep tidase), the RG57 DNA RFLP fingerprinting probe, as well as resistance to the fungicide metalaxyl and mating type, have been used as markers. P. infestans populations in Mexico have been one of the main focuses of research in the population biology of this pathogen because...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytophthora infestans; Population structure; Late blight.
Ano: 2012
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2012000200001

Demographic structure of a threatened palm (Euterpe edulis Mart.) in a fragmented landscape of Atlantic Forest in northeastern Brazil
Provedor de dados: 39
Autores: Melito,Melina Oliveira; Faria,José Cláudio; Amorim,André Márcio; Cazetta,Eliana.
At the northern limits of the range of the palm species Euterpe edulis there is an endemic ecotype, known as the "Bahia" ecotype, which is distinguished by its reddish crownshaft and low seed production. Unfortunately, little is known about its demographic characteristics. Therefore, we contrasted the density of E. edulis populations in the Una region, in the southern part of the Bahia state, Brazil, with that of other populations of the species in southern and southeastern Brazil. In addition, within the Una region, we compared a long-protected forest fragment (F1) with three recently protected fragments (F2, F3, and F4), in terms of demographic parameters and plant size, in order to determine what influence, if any, time since protection has on E. edulis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Juçara palm heart; Forest fragment; Life stages; Recruitment; Population structure.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000200011

Environmental factors affect population structure of tree ferns in the Brazilian subtropical Atlantic Forest
Provedor de dados: 39
Autores: Schwartz,Carlos Eduardo; Gasper,André Luís de.
ABSTRACT Tree ferns are important elements of tropical forests, mainly because they are common and provide microhabitats for epiphytic plants. Due to their ecological importance, the aim of this study was to evaluate population structure, distribution, and influence of environmental variables on tree ferns in the state of Santa Catarina, southern Brazil. All tree ferns with a diameter at breast height ≥ 10 cm on 418 sampling units (SUs) systematically distributed throughout the study area were measured (total sampled area of ​​153.4 ha). Population structure was evaluated through classical phytosociological parameters and the relationships among dominance and environmental variables were evaluated through multiple linear regression models. Dicksonia...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyatheaceae; Dicksoniaceae; Environmental variables; Population structure; Regression analysis; Tree ferns.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100204

Variação espaço-temporal na distribuição e abundância de Moenkhausia sanctaefilomenae (Characiformes: Characidae) em lagoas da planície de inundação do rio Cuiabá, Pantanal, Brasil - doi: 10.4025/actascibiolsci.v34i1.6809
Provedor de dados: 3
Autores: Lourenço, Luzia da Silva; Universidade Estadual Paulista; Mateus, Lucia Aparecida de Fátima; Universidade Federal de Mato Grosso; Penha, Jerry Magno; Universidade Federal de Mato Grosso.
Identificar os fatores bióticos e abióticos que determinam a variação na distribuição e abundância das populações, tornou-se nos últimos anos um grande desafio para os ecologistas. Assim neste estudo foram avaliados o efeito das variáveis abióticas e a abundância de predadores sobre a abundância de Moenkhausia sanctaefilomenae, a variação no comprimento médio dos indivíduos entre lagoas e períodos e o efeito das variáveis abióticas e da abundância de predadores sobre a estrutura em comprimento. Foram amostradas 16 lagoas da planície de inundação do rio Cuiabá, no período de junho (vazante), setembro (seca) e dezembro (enchente) de 2005 e março (cheia) de 2006. Para M. sanctaefilomenae,a distribuição é mais ampla e a abundância é maior no final da vazante,...
Tipo: Abundância; Distribuição
Palavras-chave: 2.05.00.00-9 predação; Fatores abióticos; Estrutura populacional; Ecologia populacional Ecologia predation; Abiotic factors; Population structure; Population ecology.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/6809

Growth parameters of the invasive gastropod Melanoides tuberculata (Müller, 1774) (Gastropoda, Thiaridae) in a semi-arid region, Northeastern Brazil
Provedor de dados: 3
Autores: Oliveira, Cicero Diogo Lins; Oliveira, Carlos Yure Barbosa de.
Melanoides tuberculata has invaded several aquatic ecosystems in the Neotropical region. This species shows high adaptive capacity and plasticity, establishing itself in several basins, promoting negative impacts on environments and native species. Here, we determine the growth parameters and the population structure of this species, in a semi-arid environment, in Northeast Brazil (Pernambuco state). Monthly captures were conducted at three types of substrate: site 1: soft bottom with macrophytes, site 2: soft bottom without macrophytes, and site 3: gravel and rocks. Shells were classified as occupied or empty, and their shell length (SL) and opening width (SW) were measured. The growth parameters of the von Bertalanffy’s model were estimated from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Invasive mollusk; Population structure; Growth curve. Zoologia.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/45720

Biological variables of Hypostomus francisci (Siluriformes: Loricariidae) from Itapecerica River, Minas Gerais State, Brazil
Provedor de dados: 42
Autores: SALES,CAMILA F.; DOMINGOS,FABRÍCIO FLÁVIO T.; BRIGHENTI,LUDMILA S.; RIBEIRO,ROSY I.M.A.; SANTOS,HÉLIO B.; THOMÉ,RALPH G.
ABSTRACT Herein we determine for the first time the reproduction parameters and population structure of Hypostomus francisci in the Itapecerica River, São Francisco Basin. A total of 250 specimens was captured quarterly between March 2010 and February 2012. Body weight, total length and weight of the gonads were obtained in the laboratory. Gonad samples were submitted to histological and histochemical techniques. Females with spawning capable ovaries were used to determine the fecundity and relative fecundity. Sex ratio with 1:1.01 (female:male) was observed. Males were more numerous than females for individuals smaller than 170 mm, however the number of females was significantly greater for specimens larger than 330 mm. The length-weight relationship...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fecundity; Gametogenesis; Neotropical freshwater fish; Population structure; Reproduction.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501603

Biology and population features of a rare species of Pseudopimelodidae from the Upper Paraná River Basin
Provedor de dados: 49
Autores: Esguícero,André Luiz Henríques; Arcifa,Marlene Sofia.
Streams contain an expressive fraction of the South American fish diversity, mostly composed of small-sized, endemic, and rare species. Populational, reproductive, and diet aspects of Microglanis garavelloi were studied, aiming to make a wide characterization of this species of bumblebee catfish. This is an endemic species of the Upper Paraná River Basin, and the only representative of the genus in the watershed. It is a littoral-dweller of small rivers, with asymptotic length of 34.1 mm and a population mostly composed of individuals with 20-30 mm of standard length. This species presents high fecundity and mortality rate, and low longevity and growth rate. It is a total spawner, October to February being the spawning period, and probably has brood care...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Siluriformes; Conservation; Population structure; Reproductive dynamics; Diet.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000300018

Population structure of two Astyanax Baird &amp;amp; Girard, 1854 (Teleostei, Characidae) species from upper Paraguaçu river
Provedor de dados: 52
Autores: Santos,Alexandre Clistenes de Alcântara; Novaes,José Luís Costa.
The fishes of the family Characidae are among the main species of fresh water fishes in South America. In this work, some aspects of the population structure of two Astyanax species were assessed. The fishes were caught in Santo Antônio and São José rivers, in the Paraguaçu basin, by standardized monthly samplings adapted to the microhabitats. Astyanax sp. b (São José river) presented larger size than Astyanax sp. a (Santo Antônio river). The length-weight relationship showed positive allometric growth for Astyanax sp. a, and negative for Astyanax sp. b. Both the species showed a long reproductive period, with higher activities in dry period.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Astyanax; Characidae; Chapada Diamantina; Paraguaçu River; Population structure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100013

Life Cycle Observations on Amphilocus neapolitanus (Della Valle, 1853) (Crustacea, Amphipoda) Associated with Sargassum cymosum C. Agardh, 1820 in Ubatuba, (SP), Brazil
Provedor de dados: 52
Autores: Leite,Fosca Pedini Pereira.
Day and night densities, reproductive biology and life cycle of Amphilocus neapolitanus (Della Valle, 1853), associated with Sargassum cymosum C. Agardh, 1820, were studied during 13 months. The density of juveniles, males and females was higher in night samples than in day samples. Sex ratio was strongly favorable toward the females. Ovigerous females were present in similar densities in both the periods while the non-ovigerous females were predominant at night. The egg number was not correlated with the size of the females. Breeding occurred throughout the year.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population structure; Reproductive biology; Life cycle; Amphipoda; Sargassum.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000300014

Plant population structure and insect herbivory on Solanum mauritianum Scopoli (Solanaceae) in southern Brazil: a support to biological control
Provedor de dados: 52
Autores: Barboza,Deise Mari; Marques,Márcia Cristina Mendes; Pedrosa-Macedo,José Henrique; Olckers,Terence.
Solanum mauritianum Scopoli (Solanaceae), a native Brazilian shrub, has become naturalized and invasive in several countries. In South Africa, where invasions are severe, herbivorous insects that attack S. mauritianum in its native area have been considered for introduction as biological control agents. To assess the action of such herbivores on the plant, studies were carried out on a population of S. mauritianum in an area undergoing regeneration in southern Brazil. An analysis of the structure of that population was performed, as well as of herbivory by insects, in particular of Anthonomus (Curculionidae). The population structure showed an "inverted J" pattern in diameter classes, but not in height classes. Individual plants showed an aggregate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population structure; Solanum; Anthonomus; Herbivory; Biological control.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000200019

Estrutura populacional do Camarão Sete-Barbas Xiphopenaeus kroyeri (Heller, 1862), na Foz do Rio Itajaí-Açú, Itajaí, SC, Brasil
Provedor de dados: 52
Autores: Branco,Joaquim Olinto; Lunardon-Branco,Maria José; Souto,Flávio Xavier; Guerra,Cláudio Rogério.
Xiphopenaeus kroyeri is the most exploited shrimp specie along Center-South coast of Santa Catarina State, Brazil, by artisanal fishery. In the period from March/1996 to February/1997, 3965 shrimps were collected (1843 males and 2122 females) sampled by over-trawl, with the depth oscillating between 5 and 15 meters. Xiphopenaeus kroyeri shows seasonal fluctuations in its abundance with higher rates in autumn. The population's average total-length varied between 7.5cm and 9.1cm, and the presence of juveniles was common along the year. The males and females get to the first gonadal maturation with 7.4 cm and 9.0 cm length, respectively; these lengths were reached within 6 and 8 months of age.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Xiphopenaeus kroyeri; Population structure; Sea-bob-shrimp.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000100016

Population structure and condition factor of Pseudotothyris obtusa (hypoptopomatinae) from three coastal streams in southern Brazil
Provedor de dados: 52
Autores: Takeuti,Denise de Freitas; Verani,José Roberto; Aranha,José Marcelo Rocha; Menezes,Márcia Santos de.
Population structure features and condition factor of Pseudotothyris obtusa were compared between three coastal streams in southern Brazil. Fishes were monthly collected through electric fishing and measured in the total length. Fifteen fishes from each stream were dissected to identify their sex. The structure in size, sex ratio and young/adults ratio of populations were analysed and the length-weight relationship was obtained. The condition factor (K1) and the relative condition factor (Kn) were calculated for each stream. Fishes were grouped in 11 lenght classes of 3mm. The intermediate and bigger size classes were preponderant in the "Mergulhão" and "Colônia Pereira" streams, and the smaller and intermediate ones in the "Ribeirão" stream. Females...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal streams; Pseudotothyris obtusa; Hypoptopomatinae; Population structure; Condition factor.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000400004

Signatures of Selection From Candidate Gene Polymorphisms Panel in Five Zebu Breeds
Provedor de dados: 52
Autores: Parra-Bracamonte,Gaspar Manuel; Martinez-Gonzalez,Juan Carlos; Sifuentes-Rincón,Ana María; Rosa-Reyna,Xochitl Fabiola la.
ABSTRACT The signals of selection using candidate genes polymorphism were studied in five zebu breeds of Mexico. Three loci from GHRH and complementarily Steroyl Co Desaturase F762, Dopamine Beta Hydroxilase 17299, and LEP3272 were identified under selection. Findings depict Zebu selection pressure mainly on Brahman breed resulting in a divergent structure pattern.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cattle; Population structure; PCA; Selection signals.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100442

Population structure of Chinese southwest wheat germplasms resistant to stripe rust and powdery mildew using the DArT-seq technique
Provedor de dados: 65
Autores: Chen,Tianqing; Tantasawat,Piyada Alisha; Wang,Wei; Gao,Xu; Zhang,Liyi.
ABSTRACT: Understanding genetic variability in existing wheat accessions is critical for collection, conservation and use of wheat germplasms. In this study, 138 Chinese southwest wheat accessions were investigated by genotyping using two resistance gene makers (Pm21 and Yr26) and DArT-seq technique. Finally, about 50% cultivars (lines) amplified the specific allele for the Yr26 gene (Gwm11) and 40.6% for the Pm21 gene (SCAR1265). By DArT-seq analysis, 30,485 markers (6486 SNPs and 23999 DArTs) were obtained with mean polymorphic information content (PIC) value 0.33 and 0.28 for DArT and SNP marker, respectively. The mean Dice genetic similarity coefficient (GS) was 0.72. Two consistent groups of wheat varieties were identified using principal coordinate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Population structure; DArT-seq; 6VS/6AL translocation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000400401