Consulta: subjectFacets:"Population genetics"
Registros recuperados: 117
Data/hora: 08/06/2024 15:36:31

&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

Population Genetic Aspects of Pollinator Decline
Provedor de dados: 7
Autores: Packer, Laurence; York University; bugsrus@yorku.ca; Owen, Robin; Mount Royal College and University of Calgary; rowen@mtroyal.ab.ca.
We reviewed the theory of conservation genetics, with special emphasis on the influence of haplodiploidy and other aspects of bee biology upon conservation genetic parameters. We then investigated the possibility that pollinator decline can be addressed in this way, using two meta-analytical approaches on genetic data from the Hymenoptera and the Lepidoptera. First, we compared levels of heterozygosity between the orders. As has been found previously, the haplodiploid Hymenoptera had markedly lower levels of genetic variation than the Lepidoptera. Bees had even lower levels, and bumble bees, in particular, often seemed almost monomorphic genetically. However, the statistically confounding effects of phylogeny render detailed interpretation of such data...
Tipo: Peer-Reviewed Reports
Palavras-chave: Bumble bees; Effective population size; Gene flow; Haplodiploidy; Heterozygosity; Hymenoptera; Lepidoptera; Meta-analysis; Pollinator decline; Population fragmentation; Population genetics.
Ano: 2001

Genetic diversity in two variants of Orobanche gracilis Sm. [var. gracilis and var. deludens (Beck) A. Pujadas] (Orobanchaceae) from different regions of Spain
Provedor de dados: 69
Autores: Román,Belén; Hernández,Rosabell; Pujadas-Salvá,Antonio José; Cubero,José Ignacio; Rubiales,Diego; Satovic,Zlatko.
The pattern of genetic variation among populations of two Orobanche gracilis Sm. taxa (var. gracilis and var. deludens (Beck) A. Pujadas) from Northern and Southern Spain growing on different hosts was analysed using RAPD markers. The diversity analysis within populations revealed a higher level of diversity in the populations from the North when compared to the Southern ones. The results of principal co-ordinate analysis (PCoA) based on Dice distances among samples clearly established the separation of samples according to the taxonomical variety and the geographical origin of each population. The Southern populations of both var. gracilis and var. deludens were more differentiated among them than those of var. gracilis from the North. The analysis of...
Tipo: Journal article
Palavras-chave: AMOVA; Molecular markers; Orobanche gracilis; Parasitic plants; Population genetics.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200006

Investigator Argus X-12 study on the population of northern Croatia
Provedor de dados: 74
Autores: Crnjac,Josip; Ozretić,Petar; Merkaš,Siniša; Ratko,Martina; Lozančić,Mateja; Korolija,Marina; Popović,Maja; Mršić,Gordan.
Abstract X chromosome STR typing has emerged recently as a powerful tool, complementary to autosomal STR typing, in solving complex forensic and missing person cases. Investigator® Argus X-12 is a commercial product that allows co-amplification of 12 X chromosomal markers belonging to four linkage groups (LGs). In this study, we analyzed by capillary electrophoresis blood samples from 100 females and 102 males from a population of northern Croatia. Statistical analysis included calculation of allele and haplotype frequencies, as well as forensic parameters. The most informative marker for the northern Croatia population was DXS10135 with PIC=0.9211 and a total of 27 alleles. The least polymorphic marker was DXS8378 with 6 alleles. The proportion of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: X-STR; Forensic genetics; Investigator® Argus X-12; Population genetics; Northern Croatia.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000100080

A note on the population genetic consequences of delayed larval development in insects
Provedor de dados: 74
Autores: Salles,Marcos Mattoso de; Otto,Paulo A.
Observations by Dobzhansky's group in the 1940s suggesting that the presence of recessive genotypes could account for lower larval developmental rates in Drosophila melanogaster were not confirmed at the time and all subsequent investigations on this subject focused on the analysis of ecological models based on competition among pre-adult individuals. However, a paper published in this journal in 1991 eventually confirmed the finding made by Dobzhansky and his co-workers. In this report, we provide a theoretical analysis of the population genetic effects of a delay in the rate of larval development produced by such a genetic mechanism.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Difference and differential equations; Drosophila; Dynamic systems; Larval development; Population genetics.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000300019

Genetic structure of drone congregation areas of Africanized honeybees in southern Brazil
Provedor de dados: 74
Autores: Collet,Thais; Cristino,Alexandre Santos; Quiroga,Carlos Fernando Prada; Soares,Ademilson Espencer Egea; Del Lama,Marco Antônio.
As yet, certain aspects of the Africanization process are not well understood, for example, the reproductive behavior of African and European honeybees and how the first Africanized swarms were formed and spread. Drone congregation areas (DCAs) are the ideal place to study honeybee reproduction under natural conditions since hundreds of drones from various colonies gather together in the same geographical area for mating. In the present study, we assessed the genetic structure of seven drone congregations and four commercial European-derived and Africanized apiaries in southern Brazil, employing seven microsatellite loci for this purpose. We also estimated the number of mother-colonies that drones of a specific DCA originated from. Pairwise comparison...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drone congregation area; Africanization; Honeybee reproduction; Population genetics.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000400030

Superoxide dismutase, catalase, glutathione peroxidase and gluthatione S-transferases M1 and T1 gene polymorphisms in three Brazilian population groups
Provedor de dados: 74
Autores: Hiragi,Cássia de Oliveira; Miranda-Vilela,Ana Luisa; Rocha,Dulce Maria Sucena; ,Silviene Fabiana de; Hatagima,Ana; Klautau-Guimarães,Maria de Nazaré.
Antioxidants such as superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX1) reduce the oxidation rates in the organism. Gluthatione S-transferases (GSTs) play a vital role in phase 2 of biotransformation of many substances. Variation in the expression of these enzymes suggests individual differences for the degree of antioxidant protection and geographical differences in the distribution of these variants. We described the distribution frequency of CAT (21A/T), SOD2 (Ala9Val), GPX1 (Pro198Leu), GSTM1 and GSTT1 polymorphisms in three Brazilian population groups: Kayabi Amerindians (n = 60), Kalunga Afro-descendants (n = 72), and an urban mixed population from Federal District (n = 162). Frequencies of the variants observed in Kalunga...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; PCR-RFLP; Gene polymorphisms; Brazilian ethnicities; Population genetics; Pharmacogenetics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000100003

Genetic structure of honeybee populations from southern Brazil and Uruguay
Provedor de dados: 74
Autores: Diniz,Nilza Maria; Soares,Ademilson Espencer Egea; Sheppard,Walter Steve; Del Lama,Marco Antonio.
Apis mellifera scutellata was introduced to Brazil in 1956 and Africanized honeybee populations have now spread from Argentina to the southwestern United States. Temperate climatic restrictions seem to be a natural limit to Africanized honeybee expansion around parallels 35° to 40° SL. We used allozyme loci (Mdh-1 and Hk-1) and mtDNA haplotypes to characterize honeybee populations in southern Brazil and Uruguay and define a possible transition area between Africanized and European bees. Samples of 194 bee colonies were collected from ten localities between 30°-35° SL and 52°-59° WL. The mtDNA restriction patterns of these colonies were obtained through digestion of the mitochondrial genome by Eco RI, or by digestion by Bgl II and Xba I of the cytochrome B...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Africanized honeybees; Transition area; South America; MtDNA; Allozymes; Population genetics.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000100008

Characterization of the complete mitochondrial genome and a set of polymorphic microsatellite markers through next-generation sequencing for the brown brocket deer Mazama gouazoubira
Provedor de dados: 74
Autores: Caparroz,Renato; Mantellatto,Aline M.B.; Bertioli,David J.; Figueiredo,Marina G.; Duarte,José Maurício B.
The complete mitochondrial genome of the brown brocket deer Mazama gouazoubira and a set of polymorphic microsatellite markers were identified by 454-pyrosequencing. De novo genome assembly recovered 98% of the mitochondrial genome with a mean coverage of 9-fold. The mitogenome consisted of 16,356 base pairs that included 13 protein-coding genes, two ribosomal subunit genes, 22 transfer RNAs and the control region, as found in other deer. The genetic divergence between the mitogenome described here and a previously published report was ∼0.5%, with the control region and ND5 gene showing the highest intraspecific variation. Seven polymorphic loci were characterized using 15 unrelated individuals; there was moderate genetic variation across most loci (mean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Microsatellites; Mitogenome; Population genetics; 454-pyrosequencing.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572015000300338

Population genetic structure of Sisyrinchium micranthum Cav. (Iridaceae) in Itapuã State Park, Southern Brazil
Provedor de dados: 74
Autores: Tacuatiá,Luana Olinda; Eggers,Lilian; Kaltchuk-Santos,Eliane; Souza-Chies,Tatiana T.
Sisyrinchium micranthum Cav. is a member of the family Iridaceae, which is distributed over the American continent. In Brazil, this species is found, not only in disturbed areas and coastal regions, but is also very common in urban centers, such as public parks, during the spring. Chromosome counts for North American specimens are 2n = 32 and 2n = 48, whereas in southern Brazil, there is a polyploidy series with three chromosome numbers, 2n = 16, 2n = 32, and 2n = 48. Population analyses using DNA molecular markers are inexistent for this species, in spite of its wide distribution and morphological variation. To study the genetic population structure of S. micranthum, five natural populations were accessed in a conservation park within the Atlantic Rain...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iridaceae; ISSR-PCR; Mating system; Population genetics; Sisyrinchium micranthum.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000100014

Genetic structure of natural Eugenia dysenterica DC (Myrtaceae) populations in northeastern Goiás, Brazil, accessed by morphological traits and RAPD markers
Provedor de dados: 74
Autores: Trindade,Maria da Glória; Chaves,Lázaro José.
The Brazilian Cerrado (Savannah) is a biome with great biodiversity. Many of the species found in this biome have unlimited economic potential and are used by the local population for various purposes. With the opening of the agricultural frontiers in this region, much of the native flora has been replaced by extensive areas of monocultures. Thirteen populations of the Eugenia dysenterica DC species were sampled in the northeast of the state of Goiás, Brazil, to analyze their genetic structure. Morphological traits were measured for all the progeny obtained and some of them were analyzed by using RAPD markers. The natural populations of the species showed high levels of variability for the morphological traits. The phenotypic, genotypic and genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Cagaiteira; Population genetics; Genetic structure and conservation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000300013

Genetic and phenotypic variability of iris color in Buenos Aires population
Provedor de dados: 74
Autores: Hohl,Diana María; Bezus,Brenda; Ratowiecki,Julia; Catanesi,Cecilia Inés.
Abstract The aim of this work was to describe the phenotypic and genotypic variability related to iris color for the population of Buenos Aires province (Argentina), and to assess the usefulness of current methods of analysis for this country. We studied five Single Nucleotide Polymorphisms (SNPs) included in the IrisPlex kit, in 118 individuals, and we quantified eye color with Digital Iris Analysis Tool. The markers fit Hardy-Weinberg equilibrium for the whole sample, but not for rs12913832 within the group of brown eyes (LR=8.429; p=0.004). We found a remarkable association of HERC2 rs12913832 GG with blue color (p &lt; 0.01) but the other markers did not show any association with iris color. The results for the Buenos Aires population differ from those...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population genetics; Iris color; Forensic genetics; Phenotype determination; Argentinian population.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000100050

Genetic structure of the sea-bob shrimp (Xiphopenaeus kroyeri Heller, 1862; Decapoda, Penaeidae) along the Brazilian southeastern coast
Provedor de dados: 74
Autores: Voloch,Carolina Moreira; Solé-Cava,Antonio Mateo.
The sea-bob shrimp, Xiphopenaeus kroyeri, is one of the most important economic marine resources along the entire Brazilian coast. Nevertheless, despite its economic importance, no studies have examined the population genetics of this species. In this paper, we used ten allozyme loci to study the pattern of genetic structuring in X. kroyeri along the southeastern Brazilian coast. Seven of the ten analyzed loci were polymorphic, yielding observed heterozygosity values higher than those reported for other penaeid shrimps. The population from São Paulo was significantly different from the other two populations (Rio de Janeiro and Espírito Santo), which, in turn, seem to form a single panmitic unit. Therefore, our results clearly indicate that conservation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population genetics; Allozyme electrophoresis; Fisheries stocks; Crustacea.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000200013

The golden age of Drosophila research at the Universidade de São Paulo (USP): a testimonial on the decades 1940-1950
Provedor de dados: 74
Autores: Magalhães,Luiz Edmundo de; Vilela,Carlos Ribeiro.
This article is a testimonial written by the first author regarding the research work performed with Drosophila between 1943 and 1959, at the Departamento de Biologia Geral of the Universidade de São Paulo (USP), which permitted the building of a nucleus of excellence. This research work, focused on the systematics and population genetics of the Neotropical species, began during the first of Dobzhansky's six visits to USP. Special attention was given to the multinational megaprojects conducted during his longer stays, from August 1948 to July 1949 and from June 1955 to July 1956. The role played by the Rockefeller Foundation is duly remembered, and so is the undeniable contribution brought by Dobzhansky, to the establishment of several laboratories...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Departamento de Biologia Geral; FFCL; Rockefeller Foundation; Population genetics; Theodosius Dobzhansky.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000100020

Human population genetic structure detected by pain-related mu opioid receptor gene polymorphisms
Provedor de dados: 74
Autores: López Soto,Eduardo Javier; Catanesi,Cecilia Inés.
Several single nucleotide polymorphisms (SNPs) in the Mu Opioid Receptor gene (OPRM1) have been identified and associated with a wide variety of clinical phenotypes related both to pain sensitivity and analgesic requirements. The A118G and other potentially functional OPRM1 SNPs show significant differences in their allele distributions among populations. However, they have not been properly addressed in a population genetic analysis. Population stratification could lead to erroneous conclusions when they are not taken into account in association studies. The aim of our study was to analyze OPRM1 SNP variability by comparing population samples of the International Hap Map database and to analyze a new population sample from the city of Corrientes,...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: OPRM1; SNPs; A118G; AMOVA; Population genetics.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572015000200152

The role of natural selection in human evolution – insights from Latin America
Provedor de dados: 74
Autores: Salzano,Francisco M.
Abstract A brief introduction considering Darwin's work, the evolutionary synthesis, and the scientific biological field around the 1970s and subsequently, with the molecular revolution, was followed by selected examples of recent investigations dealing with the selection-drift controversy. The studies surveyed included the comparison between essential genes in humans and mice, selection in Africa and Europe, and the possible reasons why females in humans remain healthy and productive after menopause, in contrast with what happens in the great apes. At the end, selected examples of investigations performed in Latin America, related to the action of selection for muscle performance, acetylation of xenobiotics, high altitude and tropical forest adaptations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Natural selection; Human evolution; Population genetics; Human adaptation; History of genetics.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572016000300302

Molecular genetic diversity in populations of the stingless bee Plebeia remota: A case study
Provedor de dados: 74
Autores: Francisco,Flávio de Oliveira; Santiago,Leandro Rodrigues; Arias,Maria Cristina.
Genetic diversity is a major component of the biological diversity of an ecosystem. The survival of a population may be seriously threatened if its genetic diversity values are low. In this work, we measured the genetic diversity of the stingless bee Plebeia remota based on molecular data obtained by analyzing 15 microsatellite loci and sequencing two mitochondrial genes. Population structure and genetic diversity differed depending on the molecular marker analyzed: microsatellites showed low population structure and moderate to high genetic diversity, while mitochondrial DNA (mtDNA) showed high population structure and low diversity in three populations. Queen philopatry and male dispersal behavior are discussed as the main reasons for these findings.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MtDNA; Meliponini; Microsatellites; Philopatry; Population genetics.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000100017

Genetic variability in geographical populations of Aedes aegypti (Diptera, Culicidae) in Brazil elucidated by molecular markers
Provedor de dados: 74
Autores: Paduan,Karina dos Santos; Araújo-Júnior,João P.; Ribolla,Paulo E.M.
The tropical mosquito, Aedes aegypti is the most important domestic vector of urban yellow fever and dengue. Genetic population studies on this vector are important because they may lead to new tools for surveillance. An analysis of genetic structure was conducted among populations of A. aegypti from 11 localities in four demographic regions within six Brazilian federal states. Markers included 21 random amplified polymorphic DNA (RAPD) loci. RAPD markers were detected among populations and cluster analysis revealed two main groups. We found high genetic polymorphism (H S = 0.224) and high levels of genetic differentiation between populations from different states (G ST = 0.430), as well as in populations from cities in the same state (G ST = 0.410). These...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aedes aegypti; Population genetics; Random amplified polymorphic DNA; Genetic variability.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000200030

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

Genetic diversity and structure of Atta robusta (Hymenoptera, Formicidae, Attini), an endangered species endemic to the restinga ecoregion
Provedor de dados: 74
Autores: Reis,Evelyze Pinheiro dos; Salomão,Tânia Maria Fernandes; Campos,Lucio Antonio de Oliveira; Tavares,Mara Garcia.
The genetic diversity and structure of the ant Atta robusta were assessed by ISSR (inter-simple sequence repeats) in 72 colonies collected from 10 localities in the Brazilian states of Espírito Santo (48 colonies) and Rio de Janeiro (24 colonies). The ISSR pattern included 67 bands, 51 of them (76.1%) polymorphic. Analysis of molecular variance (AMOVA) revealed a high level (57.4%) of inter-population variation, which suggested a high degree of genetic structure that was confirmed by UPGMA (unweighted pair-group method using an arithmetic average) cluster analysis. The significant correlation between genetic and geographic distances (r = 0.64, p &lt; 0.05) indicated isolation that reflected the distance between locations. Overall, the populations were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Endemism; Endangered; ISSR; Population genetics; Restinga.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000400015

Population structure and genetic variability of mainland and insular populations of the Neotropical water rat, Nectomys squamipes (Rodentia, Sigmodontinae)
Provedor de dados: 74
Autores: Almeida,Francisca C.; Maroja,Luana S.; Moreira,Miguel A.M.; Seuánez,Héctor N.; Cerqueira,Rui.
Seven microsatellite loci were used to investigate the genetic variability and structure of six mainland and two island populations of the Neotropical water rat Nectomys squamipes, a South American semi-aquatic rodent species with a wide distribution. High levels of variability were found within mainland populations while island populations were less variable but the more differentiated in respect to allele number and frequency. The time of biological divergence between mainland and island populations coincided with geological data. A significant geographic structure was found in mainland populations (theta = 0.099; rho = 0.086) although the degree of differentiation was relatively low in respect to the distance between surveyed localities (24 to 740 km)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microsatellites; Population genetics; Islands; Population expansion; Population size; Divergence time.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000500008

Inclusion of South American samples reveals new population structuring of the blacktip shark (Carcharhinus limbatus) in the western Atlantic
Provedor de dados: 74
Autores: Sodré,Davidson; Rodrigues-Filho,Luis F.S.; Souza,Rosália F.C.; Rêgo,Péricles S.; Schneider,Horacio; Sampaio,Iracilda; Vallinoto,Marcelo.
Carcharhinus limbatus has a cosmopolitan distribution and marked genetic structuring, mainly because of its philopatric behavior. However, analysis of this structuring has not previously included South American populations. In the present study, we analyzed a sample of adult individuals collected on the northern coast of Brazil and compared the sequences of the mitochondrial control region with those of populations already genotyped. Relatively high haplotype diversity (12 haplotypes, genetic diversity of 0.796) was observed, similar to that in other populations but with a much larger number of private alleles. In contrast to populations studied previously, which were represented by neonates, the pronounced allelic variability found in the South American...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcharhinus limbatus; Control region; Fishery stocks; Mitochondrial DNA; Population genetics.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000500008

Patterns of genetic diversity in southern and southeastern Araucaria angustifolia (Bert.) O. Kuntze relict populations
Provedor de dados: 74
Autores: Souza,Maria Isabel Ferreira de; Salgueiro,Fabiano; Carnavale-Bottino,Mariana; Félix,Durvalina Benedita; Alves-Ferreira,Marcio; Bittencourt,Juliana Vitoria Messias; Margis,Rogério.
Habitat fragmentation and a decrease in population size may lead to a loss in population genetic diversity. For the first time, the reduction in genetic diversity in the northernmost limit of natural occurence (southeastern Brazil) of Araucaria angustifolia in comparison with populations in the main area of the species continuous natural distribution (southern Brazil), was tested. The 673 AFLPs markers revealed a high level of genetic diversity for the species (Ht = 0.27), despite anthropogenic influence throughout the last century, and a decrease of H in isolated populations of southeastern Brazil (H = 0.16), thereby indicating the tendency for higher genetic diversity in remnant populations of continuous forests in southern Brazil, when compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucariaceae; Relict populations; Araucaria forest; Population genetics; AFLP.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300018

Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci
Provedor de dados: 74
Autores: Pinto,Luciana Rossini; Vieira,Maria Lucia Carneiro; Souza Jr.,Claudio Lopes de; Souza,Anete Pereira de.
A modified reciprocal recurrent selection (RRS) method, which employed one cycle of high-intensity selection, was applied to two tropical maize (Zea mays L.) populations, BR-105 and BR-106, originating the improved synthetics IG-3 and IG-4, respectively. In the present study the effects of this kind of selection on the genetic structure of these populations and their synthetics were investigated at 30 microsatellite (SSR) loci. A total of 125 alleles were revealed. A reduction in the number of alleles was observed after selection, as well as changes in allele frequencies. In nearly 13% (BR-105) and 7% (BR-106) of the loci evaluated, the changes in allele frequencies were not explained, exclusively due to the effects of genetic drift. The effective...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population genetics; Plant breeding; Molecular markers.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000300022

Genetic characterization of 12 heterologous microsatellite markers for the giant tropical tree Cariniana legalis (Lecythidaceae)
Provedor de dados: 74
Autores: Guidugli,Marcela Corbo; Accoroni,Klaus Alvaro Guerrieri; Mestriner,Moacyr Antonio; Contel,Eucleia Primo Betioli; Martinez,Carlos Alberto; Alzate-Marin,Ana Lilia.
Twelve microsatellite loci previously developed in the tropical tree Cariniana estrellensis were genetically characterized in Cariniana legalis. Polymorphisms were assessed in 28 C. legalis individuals found between the Pardo and Mogi-Guaçu River basins in the state of São Paulo, Brazil. Of the 12 loci, 10 were polymorphic and exhibited Mendelian inheritance. The allelic richness at each locus ranged from 2-11, with an average of 7 alleles per locus, and the expected heterozygosity ranged from 0.07-0.88. These loci showed a high probability of paternity exclusion. The characteristics of these heterologous microsatellite markers indicate that they are suitable tools for investigating questions concerning population genetics in C. legalis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Jequitibá rosa; Population genetics; SSR markers; Transferability.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000100022

Genetic diversity and population structure of bocachico Prochilodus magdalenae (Pisces, Prochilodontidae) in the Magdalena River basin and its tributaries, Colombia
Provedor de dados: 74
Autores: Berdugo,Gilberto Orozco; Narváez Barandica,Juan C.
Prochilodus magdalenae is an endemic freshwater fish that occurs in the Magdalena, Sinú and Atrato hydrographic basins. It has an important economic role and is a food resource for the artisanal fishing communities. Its socioeconomic importance contrasts with the current status of its fisheries, where stocks are being depleted. Considering its importance and lack of information on its genetic structure, we used seven microsatellite markers to assess the genetic structure of wild populations of P. magdalenae. The genetic diversity was assessed and the population genetic structure was estimated through Fst, analysis of molecular variance and Bayesian analysis. A total of 290 alleles were found in all loci throughout all population. The high polymorphism...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical fish; Microsatellite; Conservation genetics; Population genetics.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000100008

AFLP marker analysis revealing genetic structure of the tree Parapiptadenia rigida (Benth.) Brenan (Leguminosae-Mimosoideae) in the southern Brazilian Tropical Rainforest
Provedor de dados: 74
Autores: Souza,Laís Bérgamo de; Ruas,Eduardo A.; Rodrigues,Luana A.; Ruas,Claudete F.; Ruas,Paulo M.
Parapiptadenia rigida is a tropical early secondary succession tree characteristic of the Tropical Atlantic Rainforest. This species is of great ecological importance in the recovery of degraded areas. In this study we investigated the variability and population genetic structure of eight populations of P. rigida. Five AFLP primer combinations were used in a sample of 159 individuals representing these eight populations, rendering a total of 126 polymorphic fragments. The averages of percentage of polymorphic loci, gene diversity, and Shannon index were 60.45%, 0.217, and 0.322, respectively. A significant correlation between the population genetic variability and the population sizes was observed. The genetic variability within populations (72.20%) was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical tree; Genetic diversity; Population genetics; Conservation; AFLP.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000400012

Studies on diversity and evolution of Iridaceae species in southern Brazil
Provedor de dados: 74
Autores: Souza-Chies,Tatiana T.; Santos,Eliane Kaltchuk dos; Eggers,Lilian; Flores,Alice Mainieri; Alves,Eudes M. Stiehl; Fachinetto,Juliana; Lustosa,Juliana; Corrêa,Lauís Brisolara; Tacuatiá,Luana Olinda; Piccoli,Paula; Miz,Rogéria Beatriz.
Plants of the family Iridaceae are well represented in the grassland vegetation of southern Brazil, occurring in the Pampa and Atlantic Forest biomes. Nevertheless, little is known about the taxonomy and evolution of Iridaceae species in southern Brazil. The main goal of this review is to compile published information about South American Iridaceae, and to discuss the evolution and genetic diversity of the family presenting our own research data in the light of the published literature. The main focus is on the genera Calydorea, Cypella, Herbertia, and Sisyrinchium. Aspects of reproductive system and of pollinator attraction are also discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytotaxonomy; Molecular phylogenetics; Iridoideae; Population genetics; Diversity.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000600018

Genetic differentiation in geographically close populations of the water rat Nectomys squamipes (Rodentia, Sigmodontinae) from the Brazilian Atlantic Forest
Provedor de dados: 74
Autores: Maroja,L.S.; Almeida,F.C.; Seuánez,H.N.
We examined the genetic structure and the effects of a bottleneck in populations of the water rat Nectomys squamipes, a primary host of Schistosoma mansoni. Eight microsatellite loci were studied in 7 populations from the Sumidouro region of the Brazilian state of Rio de Janeiro. Our data, covering a four-year period during which a bottleneck occurred, revealed substantial variation (6-31 alleles per locus) and high levels of both observed (0.718-0.789) and expected (0.748-0.832) heterozygosity. Most populations were in Hardy-Weinberg equilibrium without linkage disequilibrium between loci. Overall average genetic differentiation between populations (estimated with the F ST (q) and R ST (r) analogues was 0.037 for q and 0.060 for r. There was significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microsatellites; Migration; Population genetics; Schistosoma mansoni host; Sigmodontinae.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400002

Allozymic variation and differentiation in the chilean blue mussel, Mytilus chilensis, along its natural distribution
Provedor de dados: 74
Autores: Toro,Jorge E.; Castro,Grace C.; Ojeda,Johana A.; Vergara,Ana M.
Genetic differentiation in the Chilean blue mussel Mytilus chilensis (Hupé 1854) was investigated based on the variation in the allozyme frequencies of Pgm, Gpi, Icd, Me, Gsr, Lap and Pep in eight samples collected along 1800 km from Arauco (VIII Region) to Punta Arenas (XII Region). Despite the large geographic separations, values of Neis unbiased genetic distance, D (0.004-0.048) and standardised genetic variation among populations, Fst (0.011-0.055) were small. The levels of gene flow (Nm = 8) found in this study prevent the effect of differentiation among populations by genetic drift. This findings indicate that its long-lived planktotrophic larvae provides this species with considerable dispersal ability throughout its range which is favoured by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allozyme; Mytilus chilensis; Population genetics; Gene flow; Chile.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000100031

Development and characterization of 20 polymorphic microsatellite markers for Epinephelus marginatus (Lowe, 1834) (Perciformes: Epinephelidae) using 454 pyrosequencing
Provedor de dados: 74
Autores: Vaini,Jussara Oliveira; Mota,Kenneth Gabriel; Ojeda,Alejandra Paola; Barreiros,João Pedro; Moreira,Renata Guimarães; Hilsdorf,Alexandre Wagner Silva.
Abstract The dusky grouper, Epinephelus marginatus, is a well-known and widespread marine fish assessed as endangered by the International Union for the Conservation of Nature. Analyzing the genetic diversity of this species is, therefore, of utmost importance and necessary for conservation purposes. Microsatellites are molecular tools with advantages that are ideal for population analyses. This study provides the first set of species-specific microsatellite loci for E. marginatus that can be applied when assessing both intra- and interpopulation genetic variation. Twenty microsatellite loci were isolated and characterized for the dusky grouper by genotyping 20 individuals obtained from the North Eastern Atlantic Ocean (n = 4) and from the South Western...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Short tandem repeat; Population genetics; Conservation; Fishery; Marine resources.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000100074

Genetic variability in five populations of Partamona helleri (Hymenoptera, Apidae) from Minas Gerais State, Brazil
Provedor de dados: 74
Autores: Borges,Andreia Arantes; Campos,Lucio Antônio de Oliveira; Salomão,Tânia Maria Fernandes; Tavares,Mara Garcia.
Partamona is a Neotropical genus of stingless bees that comprises 33 species distributed from Mexico to southern Brazil. These bees are well-adapted to anthropic environments and build their nests in several substrates. In this study, 66 colonies of Partamona helleri from five localities in the Brazilian state of Minas Gerais (São Miguel do Anta, Teixeiras, Porto Firme, Viçosa and Rio Vermelho) were analyzed using nine microsatellite loci in order to assess their genetic variability. Low levels of observed (Ho = 0.099-0.137) and expected (He = 0.128-0.145) heterozygosity were encountered and revealed discrete genetic differentiation among the populations (F ST =0.025). AMOVA further showed that most of the total genetic variation (94.24%) in P. helleri was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microsatellites; Partamona helleri; Population genetics; Stingless bees.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400028

Gene variation and genetic differentiation among populations of the solitary mud dauber wasp Trypoxylon (Trypargilum) albitarse Fabricius 1804 (Hymenoptera, Crabronidae)
Provedor de dados: 74
Autores: Bergamaschi,Antonio C.B.; Lama,Marco A. Del.
Abstract Trypoxylon is a genus of solitary crabronid wasps whose population genetics is poorly known. The purpose of the present study was to investigate the genetic variation and differentiation among five populations of Trypoxylon albitarse, a species widely distributed throughout the Neotropics, with records from Panama to northern Argentina. Eight species-specific microsatellite loci were used for genotyping 96 adult wasps (one female per nest) sampled at five sites in Brazil. The analysis of allelic richness and private alleles indicated high genetic diversity in the populations sampled. Pairwise comparisons using the Fst and Dest indices revealed significant differentiation for all, but one pair of populations. Fst, Dest, AMOVA and assignment test...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population genetics; Wasps; Crabronidae; SSR markers.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572015000400519

Isolation and multiplex genotyping of polymorphic microsatellite DNA markers in the snakehead murrel, Channa striata
Provedor de dados: 74
Autores: Jamsari,Amirul Firdaus Jamaluddin; Min-Pau,Tan; Siti-Azizah,Mohd Nor.
Seven polymorphic microsatellite loci were isolated and characterized for the snakehead murrel, Channa striata (Channidae), a valuable tropical freshwater fish species. Among 25 specimens collected from Kedah state in Malaysia, the number of alleles per locus ranged from 2 to 7. Observed and expected heterozygosities ranged from 0.120 to 0.880 and 0.117 to 0.698, respectively. A single locus (CS1-C07) was significantly deviated from Hardy-Weinberg equilibrium after Bonferroni correction. These novel markers would be useful for population genetic studies of the C. striata.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Channa striata; Population genetics; Microsatellite; Multiplex PCR.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000200029

Phylogeographic analyses of the pampas cat (Leopardus colocola; Carnivora, Felidae) reveal a complex demographic history
Provedor de dados: 74
Autores: da Silva Santos,Anelisie; Trigo,Tatiane Campos; de Oliveira,Tadeu Gomes; Silveira,Leandro; Eizirik,Eduardo.
Abstract The pampas cat is a small felid that occurs in open habitats throughout much of South America. Previous studies have revealed intriguing patterns of morphological differentiation and genetic structure among its populations, as well as molecular evidence for hybridization with the closely related L. tigrinus. Here we report phylogeographic analyses encompassing most of its distribution (focusing particularly on Brazilian specimens, which had been poorly sampled in previous studies), using a novel dataset comprising 2,143 bp of the mitogenome, along with previously reported mtDNA sequences. Our data revealed strong population strutucture and supported a west-to-east colonization process in this species’ history. We detected two population expansion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phylogeography; Population genetics; Mitochondrial DNA; Conservation genetics; Historical demography.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000200273

Genetic characterisation of populations of the critically endangered Goliath grouper ( Epinephelus itajara,  Serranidae) from the Northern Brazilian coast through analyses of mtDNA
Provedor de dados: 74
Autores: Silva-Oliveira,Gláucia C.; Rêgo,Péricles S. do; Schneider,Horacio; Sampaio,Iracilda; Vallinoto,Marcelo.
The Goliath grouper ( Epinephelus itajara ) is one of the most endangered species of fish of the subfamily Epinephelinae. Slow to develop and mature, and dependent on mangrove habitats for breeding, the species also suffers intense harvesting, which has reduced drastically in numbers in many areas. To contribute to the understanding of the characteristics of  E. itajara  populations, we conducted a molecular genetics study of the species, focusing on populations from the Northern Brazilian coast. The mtDNA control region (D-loop) of 116 individuals from five localities (Bragança, Ajuruteua, Parnaíba, Fortaleza and Natal) was analysed, and a sequence of 499 base pairs identified. Analyses of the sequences indicated that genetic variability was generally...
Palavras-chave: Goliath grouper; Epinephelus itajara; Control region; MtDNA; Population genetics.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000500029

Populational genetic structure and sociogenetic structure of cocoon masses of Digelasinus diversipes (Kirby, 1882) (Hymenoptera: Symphyta: Argidae)
Provedor de dados: 74
Autores: Boraschi,Daniele; Del Lama,Marco Antonio.
Gene variation and population genetic structure of the Neotropical sawfly Digelasinus diversipes were measured by allozyme analyses using starch gel electrophoresis. Cocoon masses were collected in Eugenia glazioviana (Myrtaceae) stems, in two areas of the "Estação Ecológica Jataí" (Luiz Antônio, SP, Brazil - 21°25' S, 47°50' W), in 2000 and 2001. The average heterozygosity observed in this species (Hobs = 0.094 ± 0.025) was not significantly different from other Symphyta groups; it was, however, significantly higher than in other Hymenoptera populations. No significant levels of inbreeding were found (F IS = 0.062; chi2 = 29.9; p &gt; 0.05), but the population was subdivided (F ST = 0.070; chi2 = 458.9; p &lt; 0.05), suggesting the absence of a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic variability; Population genetics; Digelasinus diversipes; Neotropical sawfly; Allozymes.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000300013

Lack of functional KL-VS polymorphism of the KLOTHO gene in the Korean population
Provedor de dados: 74
Autores: Kim,Hee-Kwon; Jeong,Byung-Hoon.
Abstract The functional variant of the Klotho "KL-VS" stretch, which includes six polymorphisms in linkage disequilibrium, is reportedly associated with healthy aging and longevity in European and American populations. Among Asian populations, this variant has been observed in the Indian population but not in the Iranian population. An association between KL-VS polymorphism and aging has not been reported in Koreans. To investigate whether the KL-VS polymorphism could be associated with healthy aging and longevity in a Korean population, we analyzed genotype and allele frequencies of the KL-VS variant in a large Korean population sample. The KL-VS variant was not found in 874 Korean individuals. Thus, it is not possible to test its association to aging in...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Aging; KLOTHO gene; KL-VS polymorphism; Population genetics.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572016000300370

Short-tandem repeat analysis in seven Chinese regional populations
Provedor de dados: 74
Autores: Song,Xing-bo; Zhou,Yi; Ying,Bin-wu; Wang,Lan-lan; Li,Yi-song; Liu,Jian-feng; Bai,Xiao-gang; Zhang,Lei; Lu,Xiao-jun; Wang,Jun; Ye,Yuan-xin.
In the present study, we investigated the application of 13 short tandem repeat (STR) loci (D13S317, D7S820, TH01, D16S539, CSFIPO, VWA, D8S1179, TPOX, FGA, D3S1358, D21S11, D18S51 and D5S818) routinely used in forensic analysis, for delineating population relationships among seven human populations representing the two major geographic groups, namely the southern and northern Chinese. The resulting single topology revealed pronounced geographic and population partitioning, consistent with the differences in geographic location, languages and eating habits. These findings suggest that forensic STR loci might be particularly powerful tools in providing the necessary fine resolution for reconstructing recent human evolutionary history.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forensic medicine; Population genetics; Short-tandem repeat; Human evolutionary history; Genetic distance.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400002

Genetic divergence between Melipona quadrifasciata Lepeletier (Hymenoptera, Apidae) populations
Provedor de dados: 74
Autores: Tavares,Mara Garcia; Pietrani,Nathalia Teixeira; Durvale,Maxwell de Castro; Resende,Helder Canto; Campos,Lucio Antonio de Oliveira.
Melipona quadrifasciata is a stingless bee widely found throughout the Brazilian territory, with two recognized subspecies, M. quadrifasciata anthidioides, that exhibits interrupted metasomal stripes, and M. quadrifasciata quadrifasciata, with continuous metasomal stripes. This study aimed to estimate the genetic variability of these subspecies. For this purpose, 127 colonies from 15 Brazilian localities were analyzed, using nine species-specific microsatellite primers. At these loci, the number of alleles ranged from three to 15 (mean: 7.2), and the observed heterozygosity (Ho) ranged from 0.03-0.21, while the expected heterozygosity (He) ranged from 0.23-0.47. The genetic distances among populations ranged from 0.03-0.45. The F ST multilocus value (0.23)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic differentiation; Microsatellites; Population genetics; Stingless bees.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000100016

A biogeographical population genetics perspective of the colonization of cats in Latin America and temporal genetic changes in Brazilian cat populations
Provedor de dados: 74
Autores: Ruiz-García,Manuel; Alvarez,Diana.
We used nine morphological genes to analyze cat populations from Mexico, the Dominican Republic, the Colombian, Brazilian and Peruvian Amazon, Bolivia and Brazil. Most populations were in Hardy-Weinberg equilibrium at the O locus. The highest allele frequencies so far detected at world level for alleles I (inhibitor) and L (long hair) were found at La Paz (Bolivia). The analyses revealed at least five cat gene pools in Latin America: These findings suggest that the current genetic distribution of cats in Latin America correlates with the colonization of the Americas during the XIV to XVIII centuries. Additionally, the cat populations of São Paulo, Rio de Janeiro and Manaus were sampled, to compare their 1996-2003 genetic profiles with those obtained in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Domestic cats; Latin American cats; Population genetics; Genetic changes.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000400026

Genetic improvement of common carp (Cyprinus carpio L.)
Provedor de dados: 5
Autores: Vandeputte, Marc.
Common carp was the first domesticated fish species and is now a major species in worldwide aquaculture. Although research has generated a considerable body of knowledge about its genetics, genetic improvement programmes are virtually non-existent in this species and only crossbreeding is used in practice. The main reasons are the inefficiency of methods usually effective in other aquaculture species (monosexing, triploidy), and the bad image of selective breeding which is difficult to implement in ponds, and for which reliable genetic parameters were missing until recently. These parameters are now becoming available through the use of parentage assignment with microsatellite markers. However, the question of selective breeding for growth remains far from...
Tipo: Text
Palavras-chave: Selection; Population genetics; Cyprinus carpio; Breeding; Aquaculture.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6563.pdf

Genetic structure of the common sole (Solea solea) in the Bay of Biscay: Nurseries as units of selection?
Provedor de dados: 5
Autores: Guinand, B; Rolland, Jean-luc; Bonhomme, Francois.
Coastal and estuarine areas in the Bay of Biscay are essential nursery habitats for sole (Solea solea). Using three intronic markers, we investigated patterns of genetic differentiation among cohorts of juveniles (0+, 1+, sub-adults) inhabiting four major nurseries in the Vilaine and Loire river estuaries, the Pertuis d' Antioche strait, and the Gironde estuary. Genetic differentiation was not significant for the age 0- and 1-groups, but was among sub-adult samples (theta(WC) = 0.017; P = 0.031). Hierarchical analyses of genotypic frequencies by nested multivariate ANOVA using redundancy analysis indicated that northern nurseries of Loire and Vilaine rivers had different patterns of genotypic variation with age than southern nurseries of the Pertuis d'...
Tipo: Text
Palavras-chave: Selection; Genetic drift; EPIC PCR; Population genetics; Coastal nurseries; Juveniles; Flatfish.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4299.pdf

Speciation in the Deep Sea: Multi-Locus Analysis of Divergence and Gene Flow between Two Hybridizing Species of Hydrothermal Vent Mussels
Provedor de dados: 5
Autores: Faure, Baptiste; Jollivet, Didier; Tanguy, Arnaud; Bonhomme, Francois; Bierne, Nicolas.
Background: Reconstructing the history of divergence and gene flow between closely-related organisms has long been a difficult task of evolutionary genetics. Recently, new approaches based on the coalescence theory have been developed to test the existence of gene flow during the process of divergence. The deep sea is a motivating place to apply these new approaches. Differentiation by adaptation can be driven by the heterogeneity of the hydrothermal environment while populations should not have been strongly perturbed by climatic oscillations, the main cause of geographic isolation at the surface. Methodology/Principal Finding: Samples of DNA sequences were obtained for seven nuclear loci and a mitochondrial locus in order to conduct a multi-locus...
Tipo: Text
Palavras-chave: Mid atlantic ridge; Snake pit area; Population genetics; Drosophila pseudooscura; Bathymodiolus bivalvia; Statistical properties; Subdivided population; Phylogenetic networks; Dna polymorphism; Neutrality tests.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00129/24012/21972.pdf

When physical oceanography meets population genetics: The case study of the genetic/evolutionary discontinuity in the endangered goliath grouper (Epinephelus itajara, Perciformes: Epinephelidae) with comments on the conservation of the species
Provedor de dados: 5
Autores: Benevides, E. A.; Vallinoto, M. N. S.; Fetter Filho, A. F. H.; De Souza, J. R. B.; Silva-oliveira, G.; Freitas, M. O.; Ferreira, B. P.; Hostim-silva, M.; Bertoncini, A. A.; Blanchard, Fabian; Torres, R. A.
Epinephelus itajara is one of the marine fish species most threatened for extinction and it is considered to be "critically endangered" by the IUCN. The present study evaluated the genetic diversity of the species and the genetic/evolutionary relationships of its populations along the Atlantic coast of South America. The results indicate relatively reduced genetic variation, re-emphasizing the low adaptive potential of the species. One of the populations presented relatively high degrees of genetic diversity and it is evolutionary isolated from the all other populations. The evidences indicate the existence of two Evolutionarily Significant Units comprising E. itajara in the Atlantic coast of South America and the conservation prospects for the species...
Tipo: Text
Palavras-chave: Epinephelus itajara; ISSRs; Population genetics; Conservation genetics.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00230/34100/34465.pdf

Diversité et différentiation génétiques des populations de tortues vertes (Chelonia mydas) dans les sites de ponte et d'alimentation du sud-ouest de l'océan Indien : application aux stratégies de conservation de l'espèce
Provedor de dados: 5
Autores: Taquet, Coralie.
The green turtle (Chelonia mydas) is an emblematic species of marine life. However, nowadays it is subject to many threats (poaching, by-catch). Even if there is deep growing measures for its protection, the green turtle still is an endangered species and it is listed in Appendix I of Washington Convention (CITES). In order to elaborate efficient conservation and management plans, perfect knowledge of green turtle biology, but also of its population structure and their characteristics, are needed.  In this thesis, we have assessed genetic structure of green turtle populations in the South-Western Indian Ocean by using genetic tools. In all, 1551 tissue samples have been collected from our study zone and from our control site French Polynesia (37 samples)....
Tipo: Text
Palavras-chave: Management units; Microsatellites; Mitochondrial DNA; Foraging sites; Nesting sites; South Western Indian Ocean; Population genetics; Chelonia mydas; Green turtle; Unités de gestion (MUs); Microsatellites; ADN mitochondrial; Sites d'alimentation; Sites de ponte; Génétique des populations; Chelonia mydas; Tortue verte.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/these-3532.pdf

Small-scale connectivity of coralligenous habitats: insights from a modelling approach within a semi-opened Mediterranean bay
Provedor de dados: 5
Autores: Rossi, Vincent; Lo, Madiop; Legrand, Terence; Ser-giacomi, Enrico; De Jode, Aurélien; Thierry De Ville D’avray, Laure; Pairaud, Ivane; Faure, Vincent; Fraysse, Marion; Pinazo, Christel; Chenuil, Anne.
Habitat connectivity is central to several key evolutionary and ecological processes, having implications for the spatial structuring of marine populations. For benthic species that have no or little mobility as adults, connectivity is evaluated by analyzing the dispersal of propagules across the seascape. We investigate fine-scale connectivity of coralligenous habitats in Marseille Bay (located in the north-western Mediterranean) sea using high-resolution cartography and a particle-tracking model ran over a range of parameters derived from the biological traits of potential target species. We present annual and seasonal means of various connectivity diagnostics measuring the retention and exchange of propagules among coralligenous patches. A synthetic...
Tipo: Text
Palavras-chave: Habitat connectivity; Larval dispersal; Coralligenous assemblages; Benthic organisms; Oceanic circulation; Lagrangian modeling; Population genetics; Community composition.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00680/79225/81737.pdf

Analyse genetique et physiologique des interactions hote-parasite: le systeme prosorhynchus squamatus - Mytilus
Provedor de dados: 5
Autores: Coustau, Christine.
Tipo: Text
Palavras-chave: Mytilidae; Prosorhynchus squatamus; Host oreferences; Population genetics; Physiology; Parasitic diseases; Mytilus.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/these-1571.pdf

Genetics of European seabass (Dicentrarchus labrax L.)
Provedor de dados: 5
Autores: Chatain, Beatrice; Chavanne, Herve.
The production of sea bass, a major species in Mediterranean fish farming, still relies in many cases on the production of fingerlings issued from wild breeders. Still, genetic improvement is a major key to sustainable development for all optimized forms of animal production. Three types of genetic improvement can be acheived in fish: i) the production of monosex populations. For seabass, monosex female populations would be the objective as females grow 20-30% faster than males. However, sex determination in this species is complex, impacted by both genetic and environmental factors. Hence, production of monosex populations is not yet a routine operation, although in some cases almost 100% female batches have been obtained; ii) chromosome set...
Tipo: Text
Palavras-chave: Sea fishes; Population genetics; Mediterranean zone; Fish culture; Dicentrarchus labrax; Breeding.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6562.pdf

Genetic structure at different spatial scales in the pearl oyster (Pinctada margaritifera cumingii) in French Polynesian lagoons: beware of sampling strategy and genetic patchiness
Provedor de dados: 5
Autores: Arnaud, Sophie; Vonau, Vincent; Rouxel, Catherine; Bonhomme, Francois; Prou, Jean; Goyard, Emmanuel; Boudry, Pierre.
In order to study further the genetic structure of the pearl oyster Pinctada margaritifera in French Polynesia with a special consideration for the sampling scale, we analyzed or re-analyzed sets of data based on nuclear DNA markers obtained at different spatial scales. At a large scale (several 1,000 km), the remote Marquesas Islands were confirmed to be significantly differentiated from Tuamotu-Gambier and Society archipelagos, with a marked difference however for the two main islands that are different from each other. At a medium scale (several 10 to several 100 km), overall homogeneity was observed within and between these two archipelagos, with some exceptions. This could be attributed both to large-scale larval dispersal and to human-driven spat...
Tipo: Text
Palavras-chave: Population genetics; Polynesia; Bivalve; Pearl oyster; Benthic organisms; Sampling strategy; Genetic patchiness.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4960.pdf

Variance of reproductive success in the European flat oyster Ostrea edulis assessed by microsatellite-based parentage analyses in a natural population and in hatchery
Provedor de dados: 5
Autores: Lallias, Delphine; Taris, Nicolas; Boudry, Pierre; Bonhomme, Francois; Lapegue, Sylvie.
he European flat oyster (Ostrea edulis L.) is a marine bivalve whose natural geographical distribution ranges along the European Atlantic coast from Norway to Morocco, in addition to the Mediterranean and Black Sea. Previous studies of allozymes, microsat-ellites and mitochondrial differentiation over the whole range concluded that a significant divergence existed between Mediterranean and Atlantic populations, together with an isolation-by-distance pattern. However, the average mitochondrial haplotypic diversity displayed a high among populations variance, reflecting smaller effective population size in some locations. Additionally, a ten-fold quantitative difference was observed in the same study in Fst between the mitochondrial and the nuclear genomes,...
Tipo: Text
Palavras-chave: Genotypes; Genetic diversity; Breeding success; Allozymes; Population genetics; Parentage analyses; Natural population; Ostrea edulis; Oyster.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/acte-3334.pdf

Origin and route of establishment of the invasive Pacific oyster Crassostrea gigas in Scandinavia
Provedor de dados: 5
Autores: Faust, Ellika; Andre, Carl; Meurling, Sara; Kochmann, Judith; Christiansen, Henrik; Jensen, Lasse Fast; Charrier, Gregory; Laugen, Ane T.; Strand, Asa.
Identifying the routes and rates of introductions is fundamental for the understanding of marine invasions. Recurring introductions over the last 50 yr have led to the establishment of feral Pacific oyster Crassostrea gigas populations throughout Europe. In the northern countries, Sweden and Norway, the species first occurred in large numbers in 2006. Here, we investigated the relative importance of introduction via re-laying of cultured oysters imported for consumption from France, Ireland or the Netherlands, and dispersal of oyster larvae by ocean currents from wild oyster populations in Denmark. Using microsatellite DNA markers, we estimated genetic differentiation among Pacific oysters collected at 4 Swedish locations, 3 Norwegian locations and 9...
Tipo: Text
Palavras-chave: Population genetics; Microsatellites; Range expansion; Non-native species; Aquaculture; Connectivity; Scandinavia; Skagerrak.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00395/50627/72574.pdf

Genetic structure of a commercially exploited bivalve, the great scallop Pecten maximus, along the European coasts
Provedor de dados: 5
Autores: Morvezen, Romain; Charrier, Gregory; Boudry, Pierre; Chauvaud, Laurent; Breton, Florian; Strand, Oivind; Laroche, Jean.
The great scallop Pecten maximus is harvested in several European countries and fisheries targeting this species are severely regulated by fishing quotas. In addition, hatchery-based population enhancement has been developed in some countries to provide alternative or complementary production. The genetic structure of wild populations of P. maximus and the potential impact of aquaculture on the genetic diversity of this species remains poorly documented. In this study, we explored the genetic structure of P. maximus using 12 microsatellite markers, considering 14 populations sampled from Galicia (Spain) to the North of Norway, and one population of Pecten jacobaeus (L., 1758) from the Lion Gulf (Mediterranean Sea). Results indicated a clear differentiation...
Tipo: Text
Palavras-chave: Great scallop; Pecten maximus; Microsatellites; Population genetics; Aquaculture.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00311/42251/41692.pdf

The European sea bass: a key marine fish model in the wild and in aquaculture
Provedor de dados: 5
Autores: Vandeputte, Marc; Gagnaire, P.‐a.; Allal, Francois.
The European sea bass (Dicentrarchus labrax L.) is a marine fish of key economic and cultural importance in Europe. It is now more an aquaculture than a fisheries species (&gt;96% of the production in 2016), although modern rearing techniques date back only from the late 1980s. It also has high interest for evolutionary studies, as it is composed of two semispecies (Atlantic and Mediterranean lineages) that have come into secondary contact following the last glaciation. Based on quantitative genetics studies of most traits of interest over the past 10–15 years, selective breeding programs are now applied to this species, which is at the beginning of its domestication process. The availability of a good quality reference genome has accelerated the...
Tipo: Text
Palavras-chave: Dicentrarchus labrax; Genetics; Heritability; Population genetics.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00486/59752/62858.pdf

Changes in the genetic structure of Atlantic salmon populations over four decades reveal substantial impacts of stocking and potential resiliency
Provedor de dados: 5
Autores: Perrier, Charles; Guyomard, Rene; Bagliniere, Jean-luc; Nikolic, Natacha; Evanno, Guillaume.
While the stocking of captive-bred fish has been occurring for decades and has had substantial immediate genetic and evolutionary impacts on wild populations, its long-term consequences have only been weakly investigated. Here, we conducted a spatiotemporal analysis of 1428 Atlantic salmon sampled from 1965 to 2006 in 25 populations throughout France to investigate the influence of stocking on the neutral genetic structure in wild Atlantic salmon (Salmo salar) populations. On the basis of the analysis of 11 microsatellite loci, we found that the overall genetic structure among populations dramatically decreased over the period studied. Admixture rates among populations were highly variable, ranging from a nearly undetectable contribution from donor stocks...
Tipo: Text
Palavras-chave: Conservation; Population genetics; Salmo salar; Stocking; Temporal stability.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00141/25271/23328.pdf

Population genetics of the European flat oyster (Ostrea edulis) : from larvae to populations
Provedor de dados: 5
Autores: Boudry, Pierre; Launey, Sophie; Diaz-almela, E.; Naciri-graven, Yamama; Ledu, Christophe; Mira, Sara; Taris, Nicolas; Bonhomme, Francois; Lapegue, Sylvie.
Nowadays, PCR-based DNA markers allow the study of diversity and differentiation of marine organisms at different stages of their life cycle. Our study of European flat oyster (Ostrea edulis) populations has aimed to describe their spatial and temporal dynamics. First, we analyzed adults sampled over the natural range of the species.  An Atlantic/Mediterranean differentiation pattern was observed. Results were congruent between allozymes, microsatellites and mitochondrial DNA and  support an isolation by distance model. High variability was observed in the breadth of diversity between populations using a mitochondrial marker, this highlights the small effective population sizes in some locations. A 10-fold quantitative difference was observed in Fst...
Tipo: Text
Palavras-chave: Larvae; Reproduction; Genetic; Ostrea edulis; European flat oyster; Population genetics.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/acte-3493.pdf

Constitution of aquacultural stocks: Genetic aspects.
Provedor de dados: 5
Autores: Chevassus, B.
Before reaching of production level justifying an elaborated genetic improvement program, the new aquaculture species deserve a minimal strategy to avoid the consequences of uncontrolled genetic phenomena. Three main aspects will be discussed: initial constitution of the broodstock; maintenance of the broodstock; selection of the broodstock.
Tipo: Text
Palavras-chave: Oncorhynchus keta; Salmo salar; Salmo trutta; Salmonidae; Pisces; Marine molluscs; Marine fish; Sex ratio; Females; Males; Eggs; Larvae; Spawning populations; Aquaculture; Population genetics.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/acte-1442.pdf

Mark-recapture cloning: a straightforward and cost-effective cloning method for population genetics of single-copy nuclear DNA sequences in diploids
Provedor de dados: 5
Autores: Bierne, Nicolas; Tanguy, A; Faure, Michel; Faure, B; David, E; Boutet, I; Boon, E; Quere, N; Plouviez, S; Kemppainen, P; Jollivet, D; Moraga, D; Boudry, Pierre; David, P.
We describe a simple protocol to reduce the number of cloning reactions of nuclear DNA sequences in population genetic studies of diploid organisms. Cloning is a necessary step to obtain correct haplotypes in such organisms, and, while traditional methods are efficient at cloning together many genes of a single individual, population geneticists rather need to clone the same locus in many individuals. Our method consists of marking individual sequences during the polymerase chain reaction (PCR) using 5'-tailed primers with small polynucleotide tags. PCR products are mixed together before the cloning reaction and clones are sequenced with universal plasmid primers. The individual from which a sequence comes from is identified by the tag sequences upstream...
Tipo: Text
Palavras-chave: Sequence; Population genetics; High throughput allele recognition; DNA polymorphism.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-4222.pdf

Genetic Characterization of Cupped Oyster Resources in Europe Using Informative Single Nucleotide Polymorphism (SNP) Panels
Provedor de dados: 5
Autores: Lapegue, Sylvie; Heurtebise, Serge; Cornette, Florence; Guichoux, Erwan; Gagnaire, Pierre-alexandre.
The Pacific oyster, Crassostrea gigas, was voluntarily introduced from Japan and British Columbia into Europe in the early 1970s, mainly to replace the Portuguese oyster, Crassostrea angulata, in the French shellfish industry, following a severe disease outbreak. Since then, the two species have been in contact in southern Europe and, therefore, have the potential to exchange genes. Recent evolutionary genomic works have provided empirical evidence that C. gigas and C. angulata exhibit partial reproductive isolation. Although hybridization occurs in nature, the rate of interspecific gene flow varies across the genome, resulting in highly heterogeneous genome divergence. Taking this biological property into account is important to characterize genetic...
Tipo: Text
Palavras-chave: Cupped oysters; Population genetics; Introgression; Conservation; Shellfisheries.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00623/73544/72938.pdf

Oyster population genetics : understanding natural populations and tracing introductions
Provedor de dados: 5
Autores: Lapegue, Sylvie; Boudry, Pierre.
Oysters are among the most familiar of all marine invertebrate taxa. However our knowledge of oyster phylogeny and systematics is fragmentary. This is principally due to the plastic growth patterns of these animals, which result in a wide range of overlapping, ecophenotypic variants that greatly reduce the value of analysis based on shell morphology. Besides that, many intentional or accidental anthropogenic transfers have emphasised this situation. In several cases of misclassification or misidentification of oysters, DNA molecular data, have provided valuable new insights on the tracing of introductions or more generally on the phylogeographic relationships between oyster species. We will illustrate this issue with recent case studies from our lab on...
Tipo: Text
Palavras-chave: Genetic; Ostreola stentina; Crassostrea honkongensis; Crassostrea gigas; Crassostrea angulata; Oysters; Population genetics.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/acte-3475.pdf

EDENetworks: A user-friendly software to build and analyse networks in biogeography, ecology and population genetics
Provedor de dados: 5
Autores: Kivela, Mikko; Arnaud-haond, Sophie; Saramaki, Jari.
The recent application of graph-based network theory analysis to biogeography, community ecology and population genetics has created a need for user-friendly software, which would allow a wider accessibility to and adaptation of these methods. EDENetworks aims to fill this void by providing an easy-to-use interface for the whole analysis pipeline of ecological and evolutionary networks starting from matrices of species distributions, genotypes, bacterial OTUs or populations characterized genetically. The user can choose between several different ecological distance metrics, such as Bray-Curtis or Sorensen distance, or population genetic metrics such as FST or Goldstein distances, to turn the raw data into a distance/dissimilarity matrix. This matrix is...
Tipo: Text
Palavras-chave: Biogeography; Biological communities; Graph theory; Microbial ecology; Network analysis; Population genetics.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00197/30853/29217.pdf

Linking basin-scale connectivity, oceanography and population dynamics for the conservation and management of marine ecosystems
Provedor de dados: 5
Autores: Dubois, Melodie; Rossi, Vincent; Ser-giacomi, Enrico; Arnaud-haond, Sophie; Lopez, Cristobal; Hernandez-garcia, Emilio.
Aim  Assessing the spatial structure and dynamics of marine populations is still a major challenge in ecology. The need to manage marine resources from ecosystem and large-scale perspectives is recognized, but our partial understanding of oceanic connectivity limits the implementation of globally pertinent conservation planning. Based on a biophysical model for the entire Mediterranean Sea, this study takes an ecosystem approach to connectivity and provides a systematic characterization of broad-scale larval dispersal patterns. It builds on our knowledge of population dynamics and discusses the ecological and management implications. Location  The semi-enclosed Mediterranean Sea and its marine ecosystems are used as a case study to investigate broad-scale...
Tipo: Text
Palavras-chave: Larval dispersal; Local retention; Marine connectivity; Marine ecosystems; Marine protected areas; Mediterranean Sea; Population dynamics; Population genetics; Self-recruitment; Source; Sink dynamics.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00311/42201/41534.pdf

Mitochondrial and nuclear DNA phylogeography of Crassostrea angulata, the Portuguese oyster endangered in Europe
Provedor de dados: 5
Autores: Huvet, Arnaud; Lapegue, Sylvie; Magoulas, A; Boudry, Pierre.
The respective status of the Portuguese oyster, Crassostrea angulata, and the Pacific oyster, Crassostrea gigas, has long been a matter of controversy. Morphological and physiological similarities, homogeneity of allozyme allelic frequencies between populations of the two taxa and the demonstration of hybridization lead most authors to suggest that they should be regrouped within the same species. The risk of introgression and the present expansion of C. gigas aquaculture in Europe raises the question of the need for preservation of C. angulata in Europe, as only a few populations remain. We studied European and Asian populations of C. gigas and C. angulata using microsatellite and mitochondrial DNA markers to estimate their genetic diversity and...
Tipo: Text
Palavras-chave: Phylogeography; Population genetics; Microsatellites; Crassostrea gigas; Crassostrea angulata.
Ano: 2000
URL: https://archimer.ifremer.fr/doc/2000/publication-707.pdf

The most vagile host as the main determinant of population connectivity in marine macroparasites
Provedor de dados: 5
Autores: Feis, Marieke E.; Thieltges, David W.; Olsen, Jeanine L.; De Montaudouin, Xavier; Jensen, K. Thomas; Bazairi, Hocein; Culloty, Sarah C.; Luttikhuizen, Pieternella C.
Although molecular ecology of macroparasites is still in its infancy, general patterns are beginning to emerge, e.g. that the most vagile host in a complex life cycle is the main determinant of the population genetic structure of their parasites. This insight stems from the observation that populations of parasites with only freshwater hosts are more structured than those with terrestrial or airborne hosts. Until now, the same has not been tested for marine systems, where, in theory, a fully marine life cycle might sustain high dispersal rates because of the absence of obvious physical barriers in the sea. Here, we tested whether a marine trematode parasite that utilises migratory birds exhibited weaker population genetic structure than those whose life...
Tipo: Text
Palavras-chave: Marine ecology; Population genetics; Parasite; Host parasite dynamics; Trematode; Invertebrates; Gymnophallus choledochus; Bucephalus minimus.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00375/48625/49417.pdf

Invasion of the eastern Bay of Biscay by the nassariid gastropod Cyclope neritea: origin and effects on resident fauna
Provedor de dados: 5
Autores: Bachelet, G; Simon-bouhet, B; Desclaux, C; Garcia-meunier, P; Mairesse, G; De Montaudouin, X; Raigne, H; Randriambao, K; Sauriau, Pierre-guy; Viard, F.
The distribution area of the nassariid gastropod Cyclope neritea (L.) includes the Mediterranean and the Black Sea, as well as the Atlantic coasts of the southern Iberian Peninsula. The species has spread north to the eastern Bay of Biscay (Arcachon Bay in 1976, Marennes-Oleron area and Morbihan Gulf in 1983-84). This spread might be explained either by (1) a natural spread favoured by environmental changes (e.g. an increase of temperature) or (2) a sudden range expansion due to the introduction of individuals from distant native populations. Molecular genetic analyses based on mitochondrial markers suggest that the present C. neritea population in Arcachon Bay has been introduced, probably unintentionally with oyster transfers, from several source...
Tipo: Text
Palavras-chave: Introduced species; Scavenging gastropods; Population genetics; Interspecific competition; Behaviour parasites.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00000/10848/7582.pdf

Highly contrasted responses of Mediterranean octocorals to climate change along a depth gradient
Provedor de dados: 5
Autores: Pivotto, I. D.; Nerini, D.; Masmoudi, M.; Kara, H.; Chaoui, L.; Aurelle, D.
Climate change has a strong impact on marine ecosystems, including temperate species. Analysing the diversity of thermotolerance levels within species along with their genetic structure enables a better understanding of their potential response to climate change. We performed this integrative study on the Mediterranean octocoral Eunicella cavolini, with samples from different depths and by means of a common garden experiment. This species does not host photosynthetic Symbiodinium, enabling us to focus on the cnidarian response. We compared the thermotolerance of individuals from 20 m and 40 m depths from the same site and with replicates from the same colony. On the basis of an innovative statistical analysis of necrosis kinetics and risk, we demonstrated...
Tipo: Text
Palavras-chave: Climate change; Adaptation; Acclimatization; Eunicella cavolini; Mediterranean sea; Population genetics.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00371/48264/48637.pdf

Phylogeny and phylogeography of Atlantic oyster species: evolutionary history, limited genetic connectivity and isolation by distance
Provedor de dados: 5
Autores: Lazoski, C.; Gusmao, J.; Boudry, Pierre; Sole-cava, A. M.
The phylogenetic relationships between naturally occurring Atlantic Crassostrea oyster species were inferred through analyses of mitochondrial (cytochrome oxidase subunit I and 16S) and nuclear (second internal transcribed spacer) sequences. We also scored 15 allozyme loci on 422 oysters to study population structuring of C. rhizophorae and C. brasiliana along 9000 km of the Western Atlantic coastline. Despite morphological similarities, C. virginica was genetically more closely related to C. rhizophorae than to C. brasiliana. In contrast, C. paraibanensis was genetically indistinguishable from C. brasiliana, which is probably a junior synonym of the African C. gasar. Significant genetic differentiation between populations of C. rhizophorae and C. gasar...
Tipo: Text
Palavras-chave: Population genetics; Biogeography; Allozymes; Cytochrome c oxidase subunit I; COI; 16S; Internal transcribed spacer 2; ITS-2.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00033/14464/11765.pdf

Apport de la génétique pour une meilleure connaissance des populations naturelles et une amélioration des populations cultivées d'huîtres plates et creuses
Provedor de dados: 5
Autores: Lapegue, Sylvie.
In the framework of the French diploma "Habilitation à Diriger des Recherches", Sylvie Lapègue's synthesis of research includes ten years (1998-2007) of work in bivalve genetics, and mainly cupped and flat oysters. This research has been developed in (1) flat oyster population genetics at the European level and cupped oyster populations and species genetics at a global scale, (2) the characterization of a cytogenetic particularity observed in oysters that corresponds to a high rate of aneuploidy in somatic cells, and (3) more recently in the use of molecular markers for the construction or improvement of genetic maps, allowing (4) the identification of areas of the genome related to the resistance to summer mortality in the Pacific oyster and the...
Tipo: Text
Palavras-chave: Ostrea; Crassostrea; Oysters; QTLs; Genetic maps; Breeding; Aneuploidy; Population genetics; Ostrea; Crassostrea; Huître; QTLs; Cartes génétiques; Amélioration; Aneuploïdie; Génétique des populations.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/these-3478.pdf

Le Polymorphisme Electrophoretique : Un Moyen d'Etude des Populations.
Provedor de dados: 5
Autores: Pichot, Paul; Pichot, Yves.
The study of biochemical polymorphisms has been known for some years as an important development. The use of a technique called electrophoresis is at the origin of the progress realized in this science. The electrophoretic detection of genetical heterogeneity existing at the level of some biochemical characters of animal species presents an important theorical and practical interest.
Tipo: Text
Palavras-chave: Pisces; Overfishing; Stock assessment; Population genetics; Electrophoresis; Biochemical analysis; Analytical techniques.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/publication-1909.pdf

An Integrated Biomarker Approach Using Flounder to Improve Chemical Risk Assessments in the Heavily Polluted Seine Estuary
Provedor de dados: 5
Autores: Borcier, Elodie; Charrier, Gregory; Couteau, Jérôme; Maillet, Géraldine; Le Grand, Fabienne; Bideau, Antoine; Waeles, Mathieu; Le Floch, Stephane; Amara, Rachid; Pichereau, Vianney; Laroche, Jean.
The objective of this study was to develop an integrative approach in ecotoxicology (from biomarkers to population genetics) to assess the ecological status of fish populations. Flounders (Platichthys flesus) collected after the spawning season in the heavily polluted Seine estuary were compared with the moderately polluted Bay of Douarnenez. The muscle energetic reserves were highly depleted in Seine vs. Douarnenez fish. The Seine fish displaying a reduced capacity to manage the oxidative stress and a higher energetic metabolism. An increase in the content of muscle membrane phospholipids (sphingomyelin, phosphatidylserine, free sterols) was detected in the Seine vs. Douarnenez fish. The data integration allowed to hypothesize relationships between...
Tipo: Text
Palavras-chave: Platichthys flesus; Estuaries; Biomarkers; Bioenergetics; Polar lipids; Population genetics.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00658/76981/78238.pdf

Diversité et différentiation génétique chez l'huître plate européenne : de la population à l'individu (Actes)
Provedor de dados: 5
Autores: Boudry, Pierre; Launey, Sophie; Diaz-almela, A.; Naciri-graven, Yamama; Ledu, Christophe; Mira, S.; Taris, Nicolas; Bonhomme, Francois; Lapegue, Sylvie.
PCR-based DNA markers enable the study of diversity and differentiation of marine organisms at different stages of their life cycle. Our study of European fiat oyster (Ostrea edulis) populations aimed to describe their spatial and temporal dynamics. First, we analyzed adults sampled over the natural range of the species. An Atlantic/Mediterranean differentiation pattern was observed. Similar patterns of variation were found using allozymes, microsatellites and mitochondrial DNA, aIl which support an isolation by distance model. High variability was observed in the range of diversity between populations using a mitochondrial marker, a reflection of small effective population sizes in sorne locations. A 10fold quantitative difference was observed in Fst,...
Tipo: Text
Palavras-chave: Recruitment; Diversity; Molecular markers; Population genetics; Ostrea edulis; Flat oyster; Dynamique de recrutement; Diversité génétique; Microsatellites; Marqueurs moléculaires; Génétique des populations; Ostrea edulis; Huître plate.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/acte-2851.pdf

The impact of aquaculture on the genetics and distribution of the onuphid annelid Diopatra biscayensis
Provedor de dados: 5
Autores: Galaska, Matthew P.; Wethey, David S.; Arias, Andrés; Dubois, Stanislas; Halanych, Kenneth M.; Woodin, Sarah A.
Aim Evolutionary history of natural populations can be confounded by human intervention such as the case of decorator worm species Diopatra (Onuphidae), which have a history of being transported through anthropogenic activities. Because they build tubes and act as ecosystem engineers, they can have a large impact on the overall ecosystem in which they occur. One conspicuous member, Diopatra biscayensis, which was only described in 2012, has a fragmented distribution that includes the Bay of Biscay and the Normanno‐Breton Gulf in the English Channel. This study explores the origin of these worms in the Normanno‐Breton region, which has been debated to either be the result of a historic range contraction from a relic continuous population or a more recent...
Tipo: Text
Palavras-chave: Bay of Biscay; Convex Hull; Onuphidae; Phylogeography; Population genetics; RADseq.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00692/80411/83522.pdf

Variabilite genetique de quelques especes de crevettes Peneides d'interet aquacole
Provedor de dados: 5
Autores: Ko, G; Pasteur, N; Bonhomme, Francois; Liao, D.
Thirteen populations belonging to seven species of Penaeid prawns (Crustacea, Decapoda) were analyzed at 29 protein loci. The authors show that both inter and intrapopulational genetic diversity are very low. These results are discussed in view of their use as guidance for aquaculture programs.
Tipo: Text
Palavras-chave: Penaeus kerathurus; Penaeus orientalis; Penaeus indicus; Penaeus monodon; Penaeus stylirostris; Penaeus japonicus; Penaeidae; Malacostraca; Prawn culture; Aquaculture development; Sexual reproduction; Biopolymorphism; Population genetics; Polymorphisme enzymatique; Variabilité génétique; Crevettes Pénaeides; Crustacés.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1186.pdf

Mutation rate of 7 X-STRs of common use in population genetics
Provedor de dados: 46
Autores: Glesmann,Laura A.; Martina,Pablo F.; Vidal Rioja,Lidia; Catanesi,Cecilia I.
Microsatellite loci analysis is a relevant tool in population genetic studies and also in paternity testing. In this field the X-chromosome STR loci are widely used for female offspring testing but their mutation rates are scarcely known. In this work we performed a mutation rate analysis of seven STR markers located in the X- chromosome specific region, in mother-son pairs and father-mother-daughter trios. Among 1015 allele transfers, we found only one change for a mother-daughter transmission in the DXS9898 locus, consisting of a loss of one single repeat. This finding allowed us to estimate a general mutation rate of &amp;#956;=9.85 x 10-4 (2.49 x 10-4 - 5.49 x 10-2) which can be applied to population studies. This value is consistent with other reports...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: X chromosome; STR; Mutation rate; Population genetics.
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332009000200002

Mathematical modelling of vector-borne diseases and insecticide resistance evolution
Provedor de dados: 80
Autores: Kuniyoshi,Maria Laura Gabriel; Santos,Fernando Luiz Pio dos.
Abstract  Background: Vector-borne diseases are important public health issues and, consequently, in silico models that simulate them can be useful. The susceptible-infected-recovered (SIR) model simulates the population dynamics of an epidemic and can be easily adapted to vector-borne diseases, whereas the Hardy-Weinberg model simulates allele frequencies and can be used to study insecticide resistance evolution. The aim of the present study is to develop a coupled system that unifies both models, therefore enabling the analysis of the effects of vector population genetics on the population dynamics of an epidemic.  Methods: Our model consists of an ordinary differential equation system. We considered the populations of susceptible, infected and recovered...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epidemiology; Population genetics; Tropical diseases; Insecticides; Theoretical modelling; Numerical simulation; ODE system.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992017000100321

Utility of 18S rDNA and ITS sequences as population markers for Lepeophtheirus salmonis (Copepoda: Caligidae) parasitising Atlantic salmon (Salmo salar) in Scotland
Provedor de dados: 16
Autores: Shinn, A.P.; Banks, B.A.; Tange, N.; Bron, J.E.; Sommerville, C.; Aoki, T.; Wootten, R.
Genetic differentiation within the salmon louse Lepeophtheirus salmonis (Krøyer, 1837), was investigated by the sequencing of specific nucleotide regions. Partial sequences of the 18S ribosomal RNA gene and the ribosomal internal transcribed spacer (ITS-1) region from single sea lice were amplified by the polymerase chain reaction (PCR). Lice were collected from wild and farmed Atlantic salmon ( Salmo salar L., 1758) from nine selected localities around the Scottish coastline. A 0.9kb fragment of the 18S ribosomal RNA gene was amplified and compared for several samples of lice which showed no observable differences between the lice from different collection sites confirming the absence of cryptic species. The 454 nucleotide ITS-1 sequence showed...
Tipo: Article / Letter to the editor
Palavras-chave: Sea louse; Copepod; Crustacea; Atlantic salmon; Sequencing; 18S ribosomal DNA; Internal transcribed spacer; Population genetics.
Ano: 2000
URL: http://www.repository.naturalis.nl/record/534343

A conservation genetic study of Rafflesia speciosa (Rafflesiaceae): patterns of genetic diversity and differentiation within and between islands
Provedor de dados: 16
Autores: Pelser, P.B.; Nickrent, D.L.; Barcelona, J.F.
Rafflesia speciosa is a threatened endo-holoparasitic species. It has several populations in the Central Panay Mountain Range (CPMR) of Panay island and a single population on Negros Island. Because R. speciosa is the only Philippine species of the genus that is not endemic to an individual island, it is a suitable species for improving our understanding of the factors underlying the high island endemism of Philippine Rafflesia. For this purpose and to inform the conservation management of R. speciosa, patterns of genetic diversity and differentiation were studied using 15 microsatellite loci and samples from nine populations. None of these populations shows evidence of inbreeding and R. speciosa has similar levels of heterozygosity as generally observed...
Tipo: Article / Letter to the editor
Palavras-chave: Microsatellites; Conservation; Negros; Panay; Philippines; Population genetics.
Ano: 2018
URL: http://www.repository.naturalis.nl/record/655789

Isoenzymatic polymorphism in the leaf-cutting ant Atta capiguara Gonçalves (hymenoptera: formicidae)
Provedor de dados: 82
Autores: Cantagalli,Liriana B; Mangolin,Claudete A; Ruvolo-Takasusuki,Maria C C.
This study was carried out to analyze the genetic population structure of Atta capiguara from 12 nests collected in Tapejara in the state of Paraná, Brazil, using isoenzyme polymorphisms. The analyzed isoenzymes were esterases (EST - EC 3.1.1.1), acid phosphatase (ACP - EC 3.1.3.2) and carbonic anhydrase (CA - EC 4.2.1.1). Ten loci were found in A.capiguara and four polymorphic loci were detected. The observed heterozigosity (0.0296) was low when compared to the expected heterozigosity (0.1461). The high value of F IS (0.7954) shows an excess of homozygous genotypes probably caused by inbreeding.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Isoenzyme; Genetic variability; Population genetics.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000100007

Host plant association and genetic differentiation of corn and rice strains of Spodoptera frugiperda Smith (Lepidoptera: Noctuidae) in Colombia
Provedor de dados: 82
Autores: Saldamando,Clara I; Vélez-Arango,Ana M.
Spodoptera frugiperda (Smith) is a polifagous insect of major economic impact in the western hemisphere and exhibits two strains (i.e., corn and rice) that are morphologically identical but differ in ecology, genetics and physiology. In this work we identified these strains and their respective hybrids by using a PCR-RFLP of the COI gene and PCR of the tandem region FR. Moreover, we performed a population structure analysis by using 253 larvae from Tolima, a region where S. frugiperda is a pest on corn, rice, sorghum and cotton. Corn strain was found on 42% in corn, 34% in cotton, 19% in sorghum and 0.04 % in rice and rice strain on 35% in corn, 0.06% in cotton, 0.06% in sorghum and 53% in rice, demonstrating that corn strain specificity is superior to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Strain; Population genetics; Pest.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000600012

Color polymorphism and allele frequency in a Brazilian population of the sunflower caterpillar Chlosyne lacinia saundersi (Doubleday) (Lepidoptera: Nymphalidae)
Provedor de dados: 82
Autores: Lopes-da-Silva,Marcelo; Casagrande,Mirna M.
The aim of this work was at calculating allele frequency color polymorphism in a population of sunflower caterpillar, Chlosyne lacinia saundersi (Doubleday) from Londrina, Paraná State, Brazil. Allele frequency in insect populations can be used as genetic marker to compare populations from different geographical and host origins. There are three phenotypes conditioned by two loci interacting epistatically. The phenotypes are: rufa (oranged colored larvae), bicolor (black larvae with dorsal orange stripes) and nigra, larvae with the body entirely black, sometimes with dorsal yellow dots, best seen in the fourth and fifth instars. Samples were taken independently in an attempt to obtain all combinations of crossing among genotypes. The genetic mechanism of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epistasis; Population genetics; Ecological genetics; Phenotype.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2003000100025

Genetic diversity of Arapaima gigas (Schinz, 1822) (Osteoglossiformes: Arapaimidae) in the Araguaia-Tocantins basin estimated by ISSR marker
Provedor de dados: 83
Autores: Vitorino,Carla A.; Oliveira,Renata C. C.; Margarido,Vladimir P.; Venere,Paulo C.
The genetic diversity of the specimens of four natural populations of Arapaima from Araguaia-Tocantins basin was assessed within and among these stocks, using five primers for ISSR. COI (cytochrome c oxidase subunit I ) partial sequences confirmed that the specimens belongs to Arapaima gigas . The ISSR provided 168 loci, of which 165 were polymorphic. However, the number of loci for each population and expected heterozygosity values were low. AMOVA showed 52.63% intra-population variation and 47.37% inter-population variation. The F ST was high among all populations (F ST ≥ 0.25), however, the cluster analysis (PCoA) and Bayesian inference showed three major groups: Araguaiana-MT + São Félix do Araguaia-MT, Novo Santo Antônio-MT and Itupiranga-PA. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bottleneck; Endogamy; F ST; Pirarucu; Population genetics.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000300557

Genetic diversity and population structure of Brycon nattereri (Characiformes: Bryconidae): a Neotropical fish under threat of extinction
Provedor de dados: 83
Autores: Galindo,Bruno A.; Ferreira,Dhiego G.; Apolinário-Silva,Caroline; Terra,Mariana C.; Aprígio,Nícollas G. O.; Ota,Renata R.; Ohara,Willian M.; Almeida,Fernanda S.; Sofia,Silvia H.
ABSTRACT Brycon nattereri is an endangered Neotropical fish reported along conserved stretches of the upper Paraná, Tocantins and São Francisco rivers. Populations of this species have been very rare in some Paraná River sub basins. This study analyzes the genetic diversity and population structure of B. nattereri in a restricted area of occurrence recently identified in upper Paraná River basin. Seven microsatellite loci and 497 bp of D-Loop mitochondrial region were examined in 92 individuals from four points along the area of occurrence. Both molecular markers indicated a single population distributed along a stretch of the river approximately 80 km long. Although some of the data suggest an ancient bottleneck, current levels of genetic diversity (H  E...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Endangered species; Molecular markers; Population genetics; Pirapitinga.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000100208

Phylogeography and conservation genetics of the Amazonian freshwater stingray Paratrygon aiereba Müller &amp;amp; Henle, 1841 (Chondrichthyes: Potamotrygonidae)
Provedor de dados: 83
Autores: Frederico,Renata G.; Farias,Izeni P.; Araújo,Maria Lúcia Góes de; Charvet-Almeida,Patricia; Alves-Gomes,José A.
The family Potamotrygonidae is monophyletic comprising three genera: Paratrygon Duméril, Potamotrygon Garman and Plesiotrygon Rosa, Castello &amp;amp; Thorson. The distribution of most species in this family is restricted to a single basin or fluvial system. Only Potamotrygon motoro, Potamotrygon orbignyi and Paratrygon aiereba are found in more than one river basin. In this study we investigate genetic structuring of Paratrygon aiereba, from five rivers of the Amazon region: Negro, Solimões-Amazon-Estuary system, Tapajós, Xingu and Araguaia. Sixty-three individuals were sequenced for ATPase 6, and a representative subsample of 27 individuals was sequenced for COI. The COI dataset analysis indicated that Paratrygon is sister to all other potamotrygonid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon basin; ATPase; COI; Population genetics.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000100007

The most important fishery resource in the Amazon, the migratory catfish Brachyplatystoma vaillantii (Siluriformes: Pimelodidae), is composed by an unique and genetically diverse population in the Solimões-Amazonas River System
Provedor de dados: 83
Autores: Formiga,Kyara Martins; Batista,Jacqueline da Silva; Alves-Gomes,José Antônio.
ABSTRACT The migratory catfish Brachyplatystoma vaillantii is one of the most important fishery resources in the Amazon. Intense capture occurs associated to its life cycle. In order to know the genetic status, we sequenced the mitochondrial DNA control region from 150 individuals of B. vaillantii, collected in five fishing landing locations, covering the length of the Solimões-Amazonas River in Brazil. Genetic diversity parameters suggest there is no genetic differentiation between the five localities. Population’s expansion indicated by R  2 and Fu’s Fs tests was also confirmed by the high number of unique haplotypes found. The Analyses of molecular variance indicated that nearly all variability was contained within locations (99.86%), and estimates of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Control region; Fishery resources; MtDNA; Piramutaba; Population genetics.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100213

Analysis of propagule pressure and genetic diversity in the invasibility of a freshwater apex predator: the peacock bass (genus Cichla)
Provedor de dados: 83
Autores: Carvalho,Daniel C.; Oliveira,Denise A. A.; Sampaio,Iracilda; Beheregaray,Luciano B.
An important step in invasive biology is to assess biological variables that could be used to predict invasion success. The study of genetics, evolution, and interactions of invasive and native species in invaded ranges provides a unique opportunity to study processes in population genetics and the capability of a species' range expansion. Here, we used information from microsatellite DNA markers to test if genetic variation relates to propagule pressure in the successful invasion of an apex predator (the Amazonian cichlid Cichla) into Southeastern Brazilian River systems. Invasive populations of Cichla have negatively impacted many freshwater communities in Southeastern Brazil since the 1960s. Reduction of genetic variation was observed in all invasive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Invasion biology; Neotropical; Population genetics; Translocation; Tucunaré.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000100105

Population genetic structuring in pacu (Piaractus mesopotamicus) across the Paraná-Paraguay basin: evidence from microsatellites
Provedor de dados: 83
Autores: Calcagnotto,Daniela; DeSalle,Rob.
The Paraná-Paraguay basin encompasses central western Brazil, northeastern Paraguay, eastern Bolivia and northern Argentina. The Pantanal is a flooded plain with marked dry and rainy seasons that, due to its soil characteristics and low declivity, has a great water holding capacity supporting abundant fish fauna. Piaractus mesopotamicus, or pacu, endemic of the Paraná-Paraguay basin, is a migratory species economically important in fisheries and ecologically as a potential seed disperser. In this paper we employ eight microsatellite loci to assess the population structure of 120 pacu sampled inside and outside the Pantanal of Mato Grosso. Our main objective was to test the null hypothesis of panmixia and to verify if there was a different structuring...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical fish; Pantanal of Mato Grosso; Population genetics; Migratory fish; Serrasalmidae.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400008

Aislamiento de Microsatélites y flujo Genético en Dosidicus Gigas (D'Orbigny, 1835) entre el Golfo de California y La Costa Occidental de La Península de Baja California, México
Provedor de dados: 20
Autores: Millán, A.M.
El calamar gigante, Dosidicus gigas (D'Orbigny, 1835) es una especie semioceánica y nerítica endémica del Pacífico Oriental, distribuida desde el norte de California E.U.A (43º N) hasta el sur de Chile (20°S), incluyendo el Golfo de California. Habita aguas desde la superficie hasta 1000 metros de profundad. Particularmente dentro del Golfo de California (México), es considerado uno de los recursos pesqueros más importantes, sin embargo el manejo de la pesquería de éste cefalópodo enfrenta varias dificultades entre las que se encuentran: un corto ciclo de vida, tasa de crecimiento desigual y falta de caracteres morfométricos y/o merísticos debido a la extrema plasticidad morfológica. Con el fin de determinar si existe estructura genética poblacional en D....
Tipo: Theses and Dissertations
Palavras-chave: Genetic isolation; Cephalopod fisheries; Population genetics; Population genetics; Http://aims.fao.org/aos/agrovoc/c_34326.
Ano: 2010
URL: http://hdl.handle.net/1834/3657

Preliminary results of morhological varability of the genus &lt;Pseudophoxinus&gt; (teleostei, cyprinidae) in Tunisia freshwaters
Provedor de dados: 20
Autores: Dkhil-Abbes, T.; Kraeim, M.M.
L’analyse de la variabilité bioécologique des populations de poissons du genre Pseudophoxinus a été réalisée par deux méthodes statistiques. La première univariée basée sur les tests de Fisher et de Duncan et a permis de distinguer l’espèce Pseudophoxinus  punicus qui s’individualise par des valeurs très élevées de nombre de branchiospines au premier arc branchial gauche et d’écailles à la ligne latérale par rapport aux autres formant un groupe biologiquement homogène. La deuxième méthode, multivariée, a permis d’une part d’isoler P. punicus des autres populations et d’autre part de séparer les populations ayant des caractères écologiques spécifiques, mettant ainsi en évidence l’effet milieu sur la répartition des populations appartenant au genre...
Tipo: Journal Contribution
Palavras-chave: Animal morphology; Comparative studies; Population genetics; Pseudophoxinus stymphalicus; Http://aims.fao.org/aos/agrovoc/c_40467.
Ano: 2008
URL: http://hdl.handle.net/1834/4240

Différenciation génétique de quelques populations Tunisiennes d'Artemia leach, 1819 (crustacé, branchiopode)
Provedor de dados: 20
Autores: Ghlala., A.; Charfi-Cheikhrouha., F.
L’analyse du polymorphisme isoenzymatique de 5 populations d’Artemia de Tunisie a été entreprise afin d’évaluer les ressources génétiques de cette espèce et d’estimer la variabilité génétique intra et interpopulationnelle. Cette analyse a été effectuée sur la base de 5 systèmes enzymatiques et 11 loci dont 7 sont polymorphes : PEP3, PEP4, IDH1, IDH2, MDH1, MDH2 et APH. Parmi ces loci, l’IDH2 et la MDH1 peuvent être considérés comme des loci diagnostiques. Les paramètres de diversité génétique estimés pour l’hétérozygotie observée, le taux de polymorphisme et le nombre moyen d’allèles par locus sont de 0.051 à 0.364, de 36.4% à 45.5% et de 1.3 à 1.7 respectivement. Les valeurs des distances génétiques de Nei (1978), calculées à partir des fréquences...
Tipo: Journal Contribution
Palavras-chave: Alleles; Biopolymorphism; Biopolymorphism; Population genetics; Statistical tables; Variability; Alleles; Population genetics; Http://aims.fao.org/aos/agrovoc/c_8724; Http://aims.fao.org/aos/agrovoc/c_34326.
Ano: 2008
URL: http://hdl.handle.net/1834/4233

Conservación y genética poblacional de ballenas jorobadas de la Península Antártica y Pacífico Sudamericano
Provedor de dados: 20
Autores: Olavarría, C.
El autor se refiere a la explotación y manejo de ballenas jorobadas del hemisferio sur, la identidad poblacional de ballenas jorobadas del Pacífico Sur Oriental y la ecología molecular de ballenas jorobadas. El artículo concluye con la mención al proyecto "Estructura genética poblacional de las áreas de alimentación de ballenas jorobadas de la Península Antártica y sur de Sudamérica usando marcadores nucleares y mitocondriales" que financia actualmente el INACH, con el cual se completarán los análisis previos de diversidad genética y estructura poblacional de ballenas jorobadas del Pacífico Sur oriental mediante métodos filogenéticos y cuantitativos. Se llevará a cabo un análisis de genotipeo de microsatélites de ADNn para complementar el análisis...
Tipo: Journal Contribution
Palavras-chave: Marine mammals; Population genetics; Population genetics; Http://aims.fao.org/aos/agrovoc/c_34326.
Ano: 2008
URL: http://hdl.handle.net/1834/3361

Estructura genética de las poblaciones de Stegastes  partitus (Perciformes: Pomacentridae) en cinco  localidades del archipiélago cubano y Bocas del Toro,  Panamá.
Provedor de dados: 20
Autores: Castellanos Gell, J.
La mayoría de los peces de arrecifes poseen un estadio larval pelágico durante el cual pueden ser  transportados largas distancias.  La inferencia  de estos patrones de conectividad  a partir de  estudios genético-poblacionales, ha cobrado gran auge debido a su utilidad en el diseño de áreas  marinas protegidas. Este trabajo se propone analizar la influencia de las posibles barreras físicas,  la biología de la especie y sus potenciales de dispersión, en la estructura genética de Stegastes  partitus y brindar elementos al esclarecimiento de esta problemática en el archipiélago cubano. Se  colectaron individuos de cinco localidades del archipiélago cubano: Los Canarreos y La Bajada, en  la región Suroccidental; y por el Norte: Cayo Coco, Los Colorados, y...
Tipo: Theses and Dissertations
Palavras-chave: Population genetics; Marine structures; DNA; Genetic selection.
Ano: 2008
URL: http://hdl.handle.net/1834/5513

Heredabilidad y correlaciones genéticas y fenotípicas para caracteres de crecimiento en el camarón blanco Litopenaeus schmitti (Burkenroad, 1936), (Decapoda, Dendrobranchiata).
Provedor de dados: 20
Autores: Bécquer Zuñiga, U.
En  Cuba el  cultivo  de  camarÿn marino    Litopenaeus  schmitti  ha  sido una  actividad  priorizada  por  el  Estado,  por  la  cantidad  de  empleos  que  genera  y  los  ingresos  obtenidos  por  la  comercializaciÿn  del  producto  final.  Trabajos  previos  indican  el  conocimiento de la estructura genþtica de las poblaciones de esta especie empleando  marcadores moleculares, existen estudios sobre reproducciÿn y nutriciÿn. Finalmente,  el cierre del ciclo de cultivo en cautiverio sumado a la experiencia de casi dos dþcadas  en esta actividad promueven  la necesidad de comenzar el mejoramiento genþtico de  L. schmitti por crýas selectivas en el paýs. En este  trabajo se describe  una metodologýa para la  formaciÿn de grupos genþticos  por...
Tipo: Theses and Dissertations
Palavras-chave: Shrimp culture; Genetic selection; Population genetics.
Ano: 2005
URL: http://hdl.handle.net/1834/5399

Impact saisonnier de l'environnement sur la structure génétique de trois populations de ruditapes decussatus dans l'ecosystème lagunaire de Bizerte (Tunisie)
Provedor de dados: 20
Autores: Fassatoui, CH.; Mdelgi-Lasram, E.; Moraga, D.; Romdhane, M.S.
في محاولة لتقييم تأثيرالاضطرابات التي يمكن ان تغير التركيبه الجينيه للمحار ببحيره بنزرت، اجريت تحاليل جينيه على عينات من ثلاثة مجموعات. و قد بينت النتائج تواجد علاقة متبادله بين فقدان التنوع ومستويات métallothionéines في خياشيم المحار التي  يمكن ان تكون مرتبطة مع وجود تدرج الانسياب المحمل بالمعادن الثقيلة بين مناطق منزل جميل،فروة والشعرة.
Tipo: Journal Contribution
Palavras-chave: Ruditapes decussatus; Clam culture; Environmental effects; Environmental impact; Heavy metals; Metallothioneins; Population genetics; Toxicity; Environmental impact; Heavy metals; Population genetics; Toxicity; Biomarkers of exposure (organisms); Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_34326; Http://aims.fao.org/aos/agrovoc/c_7826; Http://aims.fao.org/aos/agrovoc/c_36994.
Ano: 2007
URL: http://hdl.handle.net/1834/4258

Polymorphisme intraspécifique chez le syngnathe aiguille, &lt;Syngnathus acus&gt; (osteichthyes, syngnathidae) des eaux Tunisennes (Méditérranée centrale)
Provedor de dados: 20
Autores: Ben Amor, M. M.; Ben Salem, M.; Capapé, C.
De juin 2002 à juin 2005, 267 syngnathes aiguilles, &lt;Syngnathus acus&gt; Linnaeus, 1758, ont été récoltés dans les eaux tunisiennes: 204 dans Bahiret El Biban (Tunisie méridionale), 24 dans la lagune Sud de Tunis et 39 devant La Goulette (Tunisie septentrionale). Trois types d'études ont été effectués à partir de l’ensemble des variables biométriques: la première repose sur l'analyse de la variance et de la moyenne à l'aide du test "F" de Ficher et du test "t" de Student; la deuxième est fondée sur l’analyse de la multivariance (ANOVA); et la troisième est fondée sur des analyses multidimensionnelles. La première et la deuxième études ont montré des différences significatives dans les variances et les moyennes pour la plupart des caractères examinés,...
Tipo: Journal Contribution
Palavras-chave: Biometrics; Biopolymorphism; Population genetics; Statistical analysis.
Ano: 2008
URL: http://hdl.handle.net/1834/4234

Biodiversity and sustainable management of a tropical wetland lake ecosystem: A case study of Lake Kanyaboli, Kenya
Provedor de dados: 20
Autores: Rasowo, J.O.; Abila, R.; Manyala, J.
Lake Kanyaboli and the surrounding Yala swamp wetland has been recognized as an important biodiversity hotspot. Recent population genetic and phylogenetic studies confirm the evolutionary importance of Lake Kanyaboli (Kenya) in preserving the cichlid fish fauna of Lake Victoria. The adjoining Yala swamp harbours the endangered swamp antelope Sitatunga (Tragecephalus spekii) and several papyrus endemic birds. The lake and adjoining swamp play a critical role in the livelihood of the local communities who heavily depend on the wetland resources. Current ongoing large scale land use changes within the swamp threaten the ecological integrity and functioning of this highly dynamic wetland ecosystem. It is therefore imperative that proper management and...
Tipo: Proceedings Paper
Palavras-chave: Wetlands; Biodiversity; Resource conservation; Inland waters; Ecosystem management; Ecological crisis; Tropical environment; Population genetics; Phylogenetics; Lake fisheries; Freshwater fish; Aquatic birds; Land use.
Ano: 2006
URL: http://hdl.handle.net/1834/2126

Genética poblacional y filogeografía de Caretta caretta (Linnaeus, 1758)  y Cheloniamydas (Linnaeus, 1758): Una perspectiva regional con énfasis  en el suroeste de Cuba
Provedor de dados: 20
Autores: Ruiz Urquiola, A.
El manejo efectivo para la conservación de las tortugas marinas depende del  entendimiento de las interconexiones demográficas entre las poblaciones. En este trabajo  se determinaron la estructura poblacional,  la diversidad genética y las relaciones  filogenéticas y filogeográficas entre las principales colonias de anidación cubanas de  Chelonia mydas y Caretta caretta, y se compararon en un contexto regional, a partir de la  secuenciación de la primera mitad de la región no codificadora del DNA mitocóndrico, con  vistas a un manejo sostenible. En las colonias de anidación cubanas de ambas especies  estuvieron presentes los haplotipos más distribuidos y representados de los linajes de  cada especie informados para la región. No obstante, las colonias de...
Tipo: Theses and Dissertations
Palavras-chave: Population genetics; Phylogenetics; Marine turtles.
Ano: 2008
URL: http://hdl.handle.net/1834/5388

Résultats préliminaires sur la variabilité morphométrique chez le genre Pseudophoxinus  (Teleostei, Cyprinidae) dans les eaux douces tunisiennes
Provedor de dados: 20
Autores: Dkhili-Abbes. T.; Kraiem. M. M.
L’analyse de la variabilité bioécologique des populations de poissons du genre Pseudophoxinus a été réalisée par deux méthodes statistiques. La première univariée basée sur les tests de Fisher et de Duncan et a permis de distinguer l’espèce Pseudophoxinus punicus qui s’individualise par des valeurs très élevées de nombre de branchiospines au premier arc branchial gauche et d’écailles à la ligne latérale par rapport aux autres formant un groupe biologiquement homogène. La deuxième méthode, multivariée, a permis d’une part d’isoler P. punicus des autres populations et d’autre part de séparer les populations ayant des caractères écologiques spécifiques, mettant ainsi en évidence l’effet milieu sur la répartition des populations appartenant au genre...
Tipo: Journal Contribution
Palavras-chave: Pseudophoxinus; Animal morphology; Comparative studies; Population genetics; Population genetics; Animal morphology; Http://aims.fao.org/aos/agrovoc/c_34326; Http://aims.fao.org/aos/agrovoc/c_421.
Ano: 2008
URL: http://hdl.handle.net/1834/3736

Population genetic status of the Western Indian Ocean:  what do we know?
Provedor de dados: 20
Autores: Sampayo, E.M.; Ridgway, T.
Population genetics offers a useful technique for studying the population structure of marine organisms and has relevance to both systematics and the conservation of biodiversity. The Western Indian Ocean (WIO) is faced with increasing evidence of degradation and effective management initiatives are needed to curtail the environmental decline. The management of the WIO region can therefore benefit from the information that population genetics can provide. Extensive literature searches revealed only 31 genetic references for the WIO region. From a biogeographic point of view, the WIO shows little genetic exchange with the rest of the Indo- Pacific, but from a regional perspective, the limited information that exists points towards widespread genetic...
Tipo: Journal Contribution
Palavras-chave: Biogeography; Microbiology; Population genetics; Population genetics; Biogeography; Microbiology; Http://aims.fao.org/aos/agrovoc/c_34326; Http://aims.fao.org/aos/agrovoc/c_915; Http://aims.fao.org/aos/agrovoc/c_4800.
Ano: 2005
URL: http://hdl.handle.net/1834/1123

Genética bioquímica poblacional del delfín Tonina Tursiops truncatus (Montagu, 1821) de Cuba.
Provedor de dados: 20
Autores: Pérez-Cao, H.
Existe un grado de diferenciación entre las 2 poblaciones analizadas, así mismo hay una tendencia no significativa hacia un exceso de  heterocigóticos en la población total.
Tipo: Theses and Dissertations
Palavras-chave: Population genetics; Biochemistry; Marine mammals.
Ano: 1996
URL: http://hdl.handle.net/1834/4595

Evaluation of medium maturity, high-tillering Pearl Millet population diallel in Niger
Provedor de dados: 30
Autores: Haussmann, B.I.G.
Palavras-chave: Genetic techniques; Population genetics; Crossing over; Millets; Grain; Breeds (animals); Heritability; Genetic variation; Yields; Hybrids.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3205

International study on &lt;i&gt;Artemia&lt;/i&gt; : LX. Allozyme data suggest that a new &lt;i&gt;Artemia&lt;/i&gt; population in southern Chile (50° 29' S; 73° 45' W) is &lt;i&gt;A. persimilis&lt;/i&gt;
Provedor de dados: 27
Autores: Gajardo, G.; Mercado, C.; Beardmore, J.A.; Sorgeloos, P.
An &lt;i&gt;Artemia&lt;/i&gt; population from a site recently described in Chile and located in a semi-arid and humid hydrographical zone (Torres del Paine National Park), was electrophoretically characterized and cross-bred (followed through &lt;i&gt;F&lt;/i&gt;&lt;sub&gt;3&lt;/sub&gt;) to reference samples of &lt;i&gt;A. franciscana&lt;/i&gt; (San Francisco Bay, California, USA) and &lt;i&gt;A. persimilis&lt;/i&gt; (Buenos Aires, Argentina), which are the species most likely to be found in Chile. The population exhibited high levels of genetic variability as judged by the percentage of polymorphic loci (&lt;i&gt;P&lt;/i&gt;=53.3), mean number of alleles per locus (&lt;i&gt;n&lt;/i&gt;=2.2) and mean heterozygosity (&lt;i&gt;H&lt;/i&gt;=0.176). Based on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allopatric populations; Allozymes; Genetic isolation; Hybridization; Population genetics; Chile.
Ano: 1999
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=4016

Estimates of genetic parameters and variability in provenances and progeny of Handroanthus vellosoi
Provedor de dados: 190
Autores: Batista, Camila Moreira; Freitas, Miguel Luiz Menezes; Moraes, Marcela Aparecida de; Zanatto, Antonio Carlos Scatena; Santos, Pedro César dos; Zanata, Marcelo; Moraes, Mario Luiz Teixeira de; Sebbenn, Alexandre Magno.
The present study aimed at estimating genetic parameters and variability among and within provenances for silvicultural traits of Handroanthus vellosoi (Toledo) Mattos, in provenances and progenies test stands, located at the Luiz Antônio Experimental Station (São Paulo State, Brazil). The test was established in the compact family block design, with two provenances (allocated in the plots), six replicates and sub-linear plots of five plants, totalizing 35 progenies. Diameter at breast height (DBH), plant height, cylindrical volume, stem form and survival at 24 years of age were evaluated. Significant differences among the provenances were observed only to the trait stem form. The analysis of deviance showed significant differences among progenies for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ex situ conservation; Tropical tree species; Population genetics; Quantitative genetics Recursos genéticos florestais; Conservação genética; Genética de populações; Genética quantitativa; Melhoramento genético florestal Conservação ex situ; Espécies arbóreas tropicais; Genética de populações; Genética quantitativa.
Ano: 2012
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/358

Genetic diversity and relationship in American and African oil palm as revealed by RFLP and AFLP molecular markers
Provedor de dados: 86
Autores: Barcelos,Edson; Amblard,Philippe; Berthaud,Julien; Seguin,Marc.
The objective of this work was to evaluate the genetic diversity, its organization and the genetic relationships within oil palm (Elaeis oleifera (Kunth) Cortés, from America, and E. guineensis (Jacq.), from Africa) germplasm using Restriction Fragment Length Polymorphism (RFLP) and Amplified Fragment Length Polymorphism (AFLP). In complement to a previous RFLP study on 241 E. oleifera accessions, 38 E. guineensis accessions were analyzed using the same 37 cDNA probes. These accessions covered a large part of the geographical distribution areas of these species in America and Africa. In addition, AFLP analysis was performed on a sub-set of 40 accessions of E. oleifera and 22 of E. guineensis using three pairs of enzyme/primer combinations. Data were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elaeis oleifera; Elaeis guineensis; Population genetics; Palm species; Genetic resources; Molecular chacterization.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002000800008

Exon-primed intron-crossing (EPIC) markers as a tool for ant phylogeography
Provedor de dados: 92
Autores: Ströher,Patrícia R.; Li,Chenhong; Pie,Marcio R.
Exon-primed intron-crossing (EPIC) markers as a tool for ant phylogeography. Due to their local abundance, diversity of adaptations and worldwide distribution, ants are a classic example of adaptive radiation. Despite this evolutionary and ecological importance, phylogeographical studies on ants have relied largely on mitochondrial markers. In this study we design and test exon-primed intron-crossing (EPIC) markers, which can be widely used to uncover ant intraspecific variation. Candidate markers were obtained through screening the available ant genomes for unlinked conserved exonic regions interspersed with introns. A subset of 15 markers was tested in vitro and showed successful amplification in several phylogenetically distant ant species. These...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Formicidae; Molecular markers; Phylogeny; Population genetics.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262013000400014

Genetic structure of populations of Pissodes castaneus (De Geer) (Coleoptera, Curculionidae) using amplified fragment length polymorphism
Provedor de dados: 92
Autores: Zaleski,Scheila R. M.; Lazzari,Sonia M. N.; Lazzarotto,Crisleide M.; Panzavolta,Tiziana; Iede,Edson T.; Marques,Francisco de A.
Genetic structure of populations of Pissodes castaneus (De Geer) (Coleoptera, Curculionidae) using amplified fragment length polymorphism. The objective of this study was to determine the genetic structure of populations of Pissodes castaneus from different areas and on different species of Pinus using the PCR-AFLP technique. Twenty samples were analyzed, representing 19 populations from Brazil and one from Florence, Italy, which is the region of origin of P. castaneus. The four combinations of primers generated a total of 367 fragments of DNA, and 100% of polymorphic loci, indicating high degree of molecular polymorphism. The dendrogram did not reveal trends for grouping the populations in relation to origin. The low genetic similarity (0.11 between the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Banded pine weevil; Insecta; Molecular marker; Population genetics.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262013000400010

Danko Brncic and the flower-flies
Provedor de dados: 97
Autores: CARSON,HAMPTON L.
This is a personal essay commemorating Brncic as a keen naturalist/evolutionist in the best Darwinian sense. His innate curiosity, so important in a scientist, led him to the discovery of cenain unique drosophilid flies in Chile. The life cycle of one species of flower-fly (Drosophila flavopilosa) is of special interest. Females oviposit in fresh flowers of a solanaceous plant that is widespread in Chilean valleys. Twenty years of combined ecological and genetic work, carried out on this species, pioneers the use of a highly specialized Drosophila species in the study of population genetics and evolution. Many eco-genetic features are revealed that are important supplements to observations made on the widely-studied generalist species of the genus
Tipo: Journal article
Palavras-chave: Flower-breeding Drosophila; Genetic specialization; Ecology; Population genetics; Evolution.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000008

Is the evolutionary theory still useful?: A review with examples
Provedor de dados: 97
Autores: NESPOLO,ROBERTO F.
Evolutionary biology is experiencing an exceptional process of revisión and outreach because of the 200-anniversary if the birth of Charles Darwin. As a consequence, the study of organic evolution and also its teaching are being discussed at several levels, by evolutionary biologists, biologists and scholars outside evolutionary biology and by the general public. In this scenario, a didactic explanation of how biologists address evolutionary research in real populations seems to be useful. Using actual research examples, here I tried to outline how the classic theory (termed here as the "basic scheme") is useful to answer relevant questions in biology and how a less dogmatic paradigm (or a more versatile one) would be needed when dealing with the most...
Tipo: Journal article
Palavras-chave: Character displacement; Microevolution; Modern synthesis; Natural selection; Population genetics.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000400003

Genetic variability in Pseudoplatystoma reticulatum from a breeding program in Brazil
Provedor de dados: 124
Autores: Albuquerque,Daniele Menezes; Oliveira,Carlos Antonio Lopes de; Rodriguez,Maria Del Pilar Rodriguez; Ribeiro,Ricardo Pereira.
ABSTRACT The aim of this study was to characterise genetic variability in five groups of Pseudoplatystoma reticulatum: Mato Grosso I (MT-I), Mato Grosso II (MT-II), Mato Grosso III (MT-III), Mato Grosso do Sul I (MS-I) and Mato Grosso do Sul II (MS-II), taken from a centre for genetic improvement. In order to determine the allelic frequency, observed heterozygosity (HO), inbreeding coefficients (FIS), Hardy-Weinberg equilibrium (HW-p) and genetic differentiation, eight polymorphic microsatellite loci (Pcor01, Pcor05, Pcor08, Pcor10, Ppu01, Ppu04, Ppu09 and Ppu10) were selected, in which a total of 62 alleles were observed in the individuals (n = 211). The MS-I population had the highest (Pcor08 allele 83: 0.5000) and lowest (Pcor10 allele 50: 0.1667) mean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cachara; Inbreeding coefficient; Allelic Frequency; Population genetics; Microsatellites.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000100402

Structure of genetic diversity of Bemisia tabaci (Genn.) (Hemiptera: Aleyrodidae) populations in Brazilian crops and locations
Provedor de dados: 63
Autores: Fontes,Fernanda von Hertwig Mascarenhas; Colombo,Carlos Augusto; Lourenção,André Luiz.
Bemisia tabaci (Genn.) represents a complex of cryptic species that causes losses of many valuable crops. Even though there are differences in their ability to colonize hosts, transmit phytovirus and develop resistance to insecticides, the genetic differentiation of the insect populations is important for the adoption of control measures. Therefore, the genetic diversity of B. tabaci populations in economically important crops in Brazilian locations was characterized through a microsatellite analysis. Eight microsatellite markers were used for the analysis of eight populations, three in Solanum tuberosum (States of São Paulo, Minas Gerais and Bahia), two in Glycine max (States of São Paulo and Mato Grosso), one in Phaseolus vulgaris and Brassica oleracea...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SSR; Biotype B; Population genetics; Silverleaf whitefly.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100007

Intrapopulation fixation index dynamics in finite populations with variable outcrossing rates
Provedor de dados: 63
Autores: Coelho,Alexandre Siqueira Guedes; Vencovsky,Roland.
The intrapopulation fixation index ( f ) is inversely related to the outcrossing rate (t). Results obtained from data on molecular markers of natural populations have shown that these values are highly variable, even when measured in the same group of individuals. It is thus suggested that factors besides those described in Wright's genetic equilibrium must be operating. Using simulated data sets this study shows that the finite size condition of a population is sufficient to spread the estimated f values along a range at equilibrium, as opposed to keeping them at the theoretical equilibrium point. The variation in outcrossing rates can amplify this range considerably. Correlation between estimated f values obtained from different loci in this condition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population genetics; Inbreeding; Computer simulation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200015

Genetic diversity in Calibrachoa pygmaea (Solanaceae): A hawkmoth-pollinated nightshade from the Pampas
Provedor de dados: 39
Autores: Mäder,Geraldo; Backes,Alice; Reck-Kortmann,Maikel; Freitas,Loreta B.
ABSTRACT Calibrachoa pygmaea is a unique species of Calibrachoa, especially concerning its flower morphology and the environment where it occurs. The species is self-incompatible and is narrowly distributed in wet and flooded fields of the Pampas region. We characterize the genetic diversity of the species based on traditional plastid markers and newly developed nuclear microsatellites to identify drivers that guide its evolution. Our results identified markers that are informative and useful for studying the population structure of C. pygmaea, as well as that of other species of Calibrachoa. Both marker sets were congruent in developing conclusions regarding the evolutionary scenario of C. pygmaea, and revealed that the genetic variability and population...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cross-amplification; Gene flow; Genetic diversity; Plastid haplotypes; Population genetics; SSR markers; Wild petunias.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000400664

Development and characterization of microsatellite markers for Tibouchina hatschbachii (Melastomataceae), an endemic and habitat-restricted shrub from Brazil
Provedor de dados: 3
Autores: Maia, Fabiano Rodrigo; Sujii, Patricia Sanae; Goldenberg, Renato; Pereira, Viviane Silva; Zucchi, Maria Imaculada.
Tibouchina hatschbachii Wurdack (Melastomataceae) is an autogamous shrub restricted to granite (GO) and sandstone (SO) rock outcrops from subtropical Brazil. We designed primers for the amplification of microsatellite regions for T. hatschbachii, and characterized these primers to estimate genetic diversity parameters and contemporary genetic structure patterns. Eight loci were successfully amplified and were characterized using 70 individuals from three natural populations. Polymorphic information content ranged from 0.200 to 0.772 per locus. All loci were polymorphic, with allele numbers ranging from two to eight. The low degree of polymorphism may be explained by the fact that T. hatschbachii has disjunct populations and a recent genetic bottleneck, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genética Melastomataceae; Tibouchina; Granite; Sandstone; Rock outcrops; Population genetics; Simple sequence repeat (SSR) Marcadores microssatélites.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31496

Discovery and characterization of SSR markers in Eugenia uniflora L. (Myrtaceae) using low coverage genome sequencing
Provedor de dados: 42
Autores: SARZI,DEISE S.; JUSTOLIN,BEATRIZ; SILVA,CLARIANE DA; LEMOS,RAFAEL P.M.; STEFENON,VALDIR MARCOS.
Abstract: Eugenia uniflora L. (Myrtaceae) is a tree species widely distributed in South America suffering the effects of the exploitation of natural populations. In this study, we employed low coverage sequencing of the E. uniflora genome for mining of SSR markers. The de novo assembly generated 2,601 contigs with an average length of 1139 bp and spans 3.15 Mb. A total of 76 dimer, 33 trimer and two compound SSR loci were identified. Twelve selected SSR loci were employed to genotype 30 individuals from two natural populations. A total of 73 alleles were detected (mean A= 6.1) were observed, the mean effective number of alleles was Ae = 3.91, mean Ho was 0.23 and mean HE was 0.70). The mean Wright’s within population fixation index was FIS = 0.66 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Next generation sequencing; Pitanga; Population genetics; SSR; Surinam-cherry.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100625

Amplification of microsatellites in two haemulid species (Haemulon aurolineatum and Haemulon steindachneri)
Provedor de dados: 50
Autores: Pabón Quintero,Paula E.; Tavera,José Julián; Millán-Márquez,Ana María; Acero P,Arturo.
ABSTRACT Genetic-population studies in marine fish have allowed to study patterns of dispersal and connectivity between habitats. One important tool in population genetics is the use of microsatellite molecular markers. Cross-amplification of microsatellite is a method that consists in using primers designed for one species in a different one but phylogenetically related. Because of the importance of genetic studies of populations in artisanal fisheries species, primers were evaluated and designed for the species Haemulon aurolineatum and Haemulon steindachneri. Samples were collected from the artisanal fisheries in Baru-Colombia. Amplification was standardized for 12 microsatellites which ten were polymorphic for H. aurolineatum and nine for H....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Haemulidae; Grunts; Primers; Polymorphism; Population genetics.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612018000100151

Karyological, biochemical, and physiological aspects of Callophysus macropterus (Siluriformes, Pimelodidae) from the Solimões and Negro Rivers (Central Amazon)
Provedor de dados: 56
Autores: Ramirez-Gil,H.; Feldberg,E.; Almeida-Val,V.M.F.; Val,A.L.
Karyological characteristics, i.e., diploid number, chromosome morphology and nucleolus organizer regions (NORs), biochemical characteristics, i.e., electrophoretic analysis of blood hemoglobin and the tissue enzymes lactate dehydrogenase (LDH), malate dehydrogenase (MDH), alcohol dehydrogenase (ADH), and phosphoglucose isomerase (PGI), and physiological characteristics, i.e., relative concentration of hemoglobin and intraerythrocytic concentrations of organic phosphates were analyzed for the species Callophysus macropterus collected from Marchantaria Island (white water system - Solimões River) and Anavilhanas Archipelago (black water system - Negro River). Karyological and biochemical data did not reveal significant differences between specimens...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Callophysus; Fish; Amazon; Population genetics; Adaptation.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998001100014

Genetics of two marine shrimp hatcheries of the Pacific white shrimp Litopenaeus vannamei (Boone, 1931) in Pernambuco, Brazil
Provedor de dados: 65
Autores: Lima,Ana Patrícia Souza de; Silva,Suzianny Maria Bezerra Cabral da; Oliveira,Karine Kelly Cavalcanti; Maggioni,Rodrigo; Coimbra,Maria Raquel Moura.
The shrimp industry has grown significantly over the past 10 years in Brazil, especially the farmed production of the exotic Pacific white shrimp, Litopenaeus vannamei. In 2004, this industry was marked by a productivity crisis, which stirred interest towards genetic improvement of shrimp stocks. Shrimp breeders importation was banned in Brazil by a govern Normative Instruction in 1997, as a sanitary precaution. Since then, broodstock replacement in hatcheries has been based on domestic stocks, raising concerns on the decline of genetic diversity and if the existing diversity would allow effective genetic improvement programs. In the present research, genetic parameters such as number of alleles, effective allele number, expected and observed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Litopenaeus vannamei; Population genetics; Genetic diversity; Microsatellite.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010000200011

Storage protein variability in natural populations of maté (Ilex paraguariensis) in Brazil
Provedor de dados: 65
Autores: Gregianini,Tatiana Schäffer; Winge,Helga.
ABSTRACT:  Samples of 168 maté trees (Ilex paraguariensis) from four natural populations of different states of Brazil (Rio Grande do Sul, Santa Catarina, Paraná and Mato Grosso do Sul) were analyzed for their variability in storage proteins seed, which were used to estimate the degree of differentiation among and within species, because are relatively stable during evolution. Data on band presence/absence from 80 different polypeptides were used to perform similarity coefficient of Jaccard. A high level of genetic variability was reported within sampled populations (SJ intra=0.374). Lower levels of diversity were observed between populations (SJ inter=0.308). Total genetic diversity of maté was Hsp=0.264 estimated by Shannon measure. Partition of that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ‘chimarrão’; Germoplasm banks; Population genetics.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000200750