SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Reproductive and population dynamics of the Bay whiff Citharichthys spilopterus Günther, 1862 (Pleuronectiformes: Paralichthyidae) in the Mamanguá Inlet, Rio de Janeiro, Brazil

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

Neotropical Ichthyology

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...

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

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

Neotropical Ichthyology

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

Reproductive biology of Alvinocarls muricola (Decapoda : Caridea : Alvinocarididae) from cold seeps in the Congo Basin

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

Restriction to large-scale gene flow vs. regional panmixia among cold seep Escarpia spp. (Polychaeta, Siboglinidae)

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

Resultados de la campaña de evaluación de peces demersales australes efectuada en el verano de 1997.

Sex, size and timing: Sampling design for reliable population genetics analyses using microsatellite data

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

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

Signatures of Selection From Candidate Gene Polymorphisms Panel in Five Zebu Breeds

BABT

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.

Some observations on the African catfish Clarias gariepinus (Burchell) in the Sondu-Miriu River of Lake Victoria, Kenya

Palavras-chave: Cattle; Population structure; PCA; Selection signals.

Ano: 2018

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100442

Structure et diversité génétique des populations de raie bouclée en Méditerranée

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

Structure générale des peuplements d’annélides polychètes dans le secteur n-e du golfe de Tunis

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

Sustentabilidad de la explotacion del gatuzo Mustelus schmitti, en el ecosistema costero bonaerense (34 - 42°S)

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

Using neutral, selected, and hitchhiker loci to assess connectivity of marine populations in the genomic era

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

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

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

Biological Sciences

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

Variance additivity of genetic populational parameter estimates obtained through bootstrapping

Scientia Agricola

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...

Variation and genetic structure of Melipona quadrifasciata Lepeletier (Hymenoptera, Apidae) populations based on ISSR pattern

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

Genet. Mol. Biol.

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...