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Registros recuperados: 25
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Comparação entre métodos de seleção em milho cv. centralmex. Repositório Alice
VALOIS, A. C. C.; MIRANDA FILHO, J. B. de.
A cultivar de milho (Zea mays L.) Centralmex MI-VI foi plantada em quatro blocos contiguos, nos quais foram avaliados os seguintes tipos de progenies, visando a selecao recorrente: cruzamento reciproco de primeira espiga e autofecundacao da segunda espiga; cruzamento reciproco da primeira espiga, sem autofecundacao; cruzamento em cadeia e autofecundacao das primeiras espigas. Os esquemas de selecao foram baseados na avaliacao do progenies de irmaos germanos para os blocos 1, 2 e 3, e avaliacao de progenies S1 para o bloco 4. As comparacoes foram feitas quanto ao progresso esperado, com base no diferencial de selecao observado e estandardizado, estimado em funcao da intensidade de selecao; progresso esperado, considerando constante a intensidade de selecao...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Tamanho efetivo populacional; Intensidade de selecao; Herdabilidade; Indice de variacao; Effective population size; Variation index; Heritability; Selection intensity.
Ano: 1984 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/104674
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Conservação genética de populações de Cryptocarya moschata Nees (Lauraceae) na Mata Atlântica do estado de São Paulo Rev. Bras. Bot.
MORAES,PEDRO LUÍS RODRIGUES DE; MONTEIRO,REINALDO; VENCOVSKY,ROLAND.
Através da análise de 18 locos isoenzimáticos polimórficos, foram estimadas as freqüências alélicas referentes a 214 indivíduos adultos de quatro populações naturais de Cryptocarya moschata de duas regiões do estado de São Paulo. Com base nas heterozigosidades observadas e esperadas, foram obtidas estimativas das estatísticas F de Wright. Para fins de comparação, utilizou-se também o método da análise da variância para estimação dos parâmetros correspondentes F = FIT, <FONT FACE="Symbol">q</font>P= FST e f = FIS. Os dois métodos forneceram resultados bastante concordantes: <img src="http:/img/fbpe/rbb/v22s2/f.gif" alt="f.gif (76 bytes)">IT = 0,142; <img src="http:/img/fbpe/rbb/v22s2/f.gif" alt="f.gif (76 bytes)">ST = 0,140; <img...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic structure; Effective population size; Gene flow; Cryptocarya moschata.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000500004
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Decline of genetic variability in a captive population of Pacific white shrimp Penaeus (Litopenaeus) vannamei using microsatellite and pedigree information Electron. J. Biotechnol.
Vela Avitúa,Sergio; Montaldo,Hugo H; Márquez Valdelamar,Laura; Campos Montes,Gabriel R; Castillo Juárez,Héctor.
Background: The objective of this study was to estimate the decline of genetic variability and the changes in effective population size in three shrimp populations. One was a wild population collected at several points in the Mexican Pacific Ocean. The other two populations were different generations (7 and 9) from a captive population selected for growth and survival. Microsatellite markers and pedigree were both used to assess genetic variability and effective population size. Results: Using 26 loci, both captive populations showed a decline in the expected heterozygosity (20%) and allelic diversity indices (48 to 91%) compared to the wild population (P < 0.05). The studied captive populations did not differ significantly from each other regarding...
Tipo: Journal article Palavras-chave: Effective population size; Genetic diversity; Heterozygosity; Microsatellites; Selection; Shrimp.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400009
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Detecting past changes of effective population size ArchiMer
Nikolic, Natacha; Chevalet, Claude.
Understanding and predicting population abundance is a major challenge confronting scientists. Several genetic models have been developed using microsatellite markers to estimate the present and ancestral effective population sizes. However, to get an overview on the evolution of population requires that past fluctuation of population size be traceable. To address the question, we developed a new model estimating the past changes of effective population size from microsatellite by resolving coalescence theory and using approximate likelihoods in a Monte Carlo Markov Chain approach. The efficiency of the model and its sensitivity to gene flow and to assumptions on the mutational process were checked using simulated data and analysis. The model was found...
Tipo: Text Palavras-chave: Atlantic salmon; Effective population size; Microsatellites; Past demography.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00194/30565/28986.pdf
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Diversidade genética de populações de andiroba no Baixo Acre Repositório Alice
RAPOSO, A.; MARTINS, K.; CIAMPI, A.Y.; WADT, L.H. de O.; VEASEY, E.A..
O objetivo deste trabalho foi avaliar a diversidade genética em duas populações de Carapa guianensis Aubl. (andiroba), no Estado do Acre, e comparar os parâmetros de diversidade com os observados em outras populações da espécie (no Brasil: Flona Tapajós, PA, Porto Acre, AC; e na Costa Rica). Foram avaliados 77 indivíduos adultos com sete locos polimórficos de microssatélites. Observaram-se 51 alelos nas duas populações, em que o número efetivo de alelos por loco (A^ e = 3,2) foi inferior ao número médio de alelos por loco (A^ = 7,3), o que indica elevado número de alelos com baixa freqüência. Os valores estimados de f^ não diferiram de zero, o que mostra que não ocorre endogamia nas populações. A taxa de cruzamento aparente foi alta (t^a = 1,11 na...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Carapa guianensis; Marcadores microssatélites; Tamanho efetivo populacional; Conservação de recursos genéticos; Alelos raros; Fluxo gênico; Microsatellite markers; Effective population size; Genetic resources conservation; Rare alleles; Gene flow.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/122809
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Estimating effective population size of large marine populations, is it feasible? ArchiMer
Marandel, Florianne; Lorance, Pascal; Berthele, Olivier; Trenkel, Verena; Waples, Robin S.; Lamy, Jean-baptiste.
stainable exploitation of marine populations is a challenging task relying on information about their current and past abundance. Fisheries‐related data can be scarce and unreliable making them unsuitable for quantitative modelling. One fishery independent method that has attracted attention in this context consists in estimating the effective population size (Ne), a concept founded in population genetics. We reviewed recent empirical studies on Ne and carried out a simulation study to evaluate the feasibility of estimating Ne in large fish populations with the currently available methods. The detailed review of 26 studies found that published empirical Ne values were very similar despite differences in species and total population sizes (N). Genetic...
Tipo: Text Palavras-chave: Census population size; Effective population size; Fish; Linkage disequilibrium; Management; Simulation.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00470/58162/60678.pdf
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Estimation of variance components and prediction of breeding values in rubber tree breeding using the REML/BLUP procedure Genet. Mol. Biol.
Furlani,Renata Capistrano Moreira; Moraes,Mario Luiz Teixeira de; Resende,Marcos Deon Vilela de; Furlani Junior,Enes; Gonçalves,Paulo de Souza; Valério Filho,Walter Veriano; Paiva,João Rodrigues de.
The present paper deals with estimation of variance components, prediction of breeding values and selection in a population of rubber tree [Hevea brasiliensis (Willd. ex Adr. de Juss.) Müell.-Arg.] from Rio Branco, State of Acre, Brazil. The REML/BLUP (restricted maximum likelihood/best linear unbiased prediction) procedure was applied. For this purpose, 37 rubber tree families were obtained and assessed in a randomized complete block design, with three unbalanced replications. The field trial was carried out at the Experimental Station of UNESP, located in Selvíria, State of Mato Grosso do Sul, Brazil. The quantitative traits evaluated were: girth (G), bark thickness (BT), number of latex vessel rings (NR), and plant height (PH). Given the unbalanced...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Linear mixed model; Effective population size; Breeding strategies; Rubber tree improvement.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000200017
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Estimativa de parâmetros genéticos em progênies de irmãos completos de eucalipto e otimização de seleção. Repositório Alice
NOGUEIRA, T. A. P. C.; NUNES, A. C. P.; SANTOS, G. A. dos; TAKAHASHI, E. K.; RESENDE, M. D. V. de; CORRADI, I. S..
O objetivo desse trabalho foi selecionar as melhores progênies e indivíduos de um teste de progênies de irmãos completos de eucalipto com base no tamanho efetivo populacional, endogamia e ganho genético. O delineamento experimental foi de blocos incompletos, contendo 18 progênies, 75 repetições com uma planta por parcela. No mesmo experimento, 388 clones comerciais de E. urophylla × E. grandis foram utilizados como controle. Aos 6 anos de idade, os caracteres avaliados foram diâmetro à altura do peito, altura total, volume, incremento médio anual (IMA) e sobrevivência. As análises foram realizadas com base no procedimento genético-estatístico de modelos mistos via REML/BLUP. Para otimização de seleção foi feita simulação de 30 diferentes cenários, com...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Irmãos germanos; Tamanho efetivo populacional; Full-sib families; Endogamy; Effective population size; Progenie tests; Endogamia; Eucalipto; Teste de Progênie; Eucalyptus.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1114081
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Evaluation of conservation program for the Pantaneiro horse in Brazil R. Bras. Zootec.
McManus,Concepta; Santos,Sandra Aparecida; Dallago,Bruno Stéfano Lima; Paiva,Samuel Rezende; Martins,Rafhael Felipe Saraiva; Braccini Neto,José; Marques,Pedro Rocha; Abreu,Urbano Gomes Pinto de.
A genealogical analysis of registered Pantaneiro horses was carried out with 3647 males and 6794 females. Of these animals, 50.66% had identified sires and 48.86% identified dams. The number of pedigrees increased over the generations, with higher registration of parents of sires than dams. Two municipalities are responsible for almost 70% of all registers: i) Poconé (Mato Grosso State), where the headquarters of the breeders association is located and ii) Corumbá (Mato Grosso do Sul State), where EMBRAPA Pantanal conducts its research. The mean inbreeding was 0.04% and average relatedness was 0.13%. Mean generation interval was 8.20 years. There is moderate to high genetic differentiation between farms (15% of total genetic variation) while between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Average relatedness; Effective population size; Farm; Inbreeding; Municipality; Wright's statistics.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000600004
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Fisheries-induced neutral and adaptive evolution in exploited fish populations and consequences for their adaptive potential ArchiMer
Marty, Lise; Dieckmann, Ulf; Ernande, Bruno.
Fishing may induce neutral and adaptive evolution affecting life-history traits, and molecular evidence has shown that neutral genetic diversity has declined in some exploited populations. Here we theoretically study the interplay between neutral and adaptive evolution caused by fishing. An individual-based eco-genetic model is devised that includes neutral and functional loci in a realistic ecological setting. In line with theoretical expectations, we find that fishing induces evolution towards slow growth, early maturation at small size, and higher reproductive investment. We show, first, that the choice of genetic model (based on either quantitative genetics or gametic inheritance) influences the evolutionary recovery of traits after fishing ceases....
Tipo: Text Palavras-chave: Eco-genetic model; Effective population size; Fisheries-induced evolution; Genetic drift; Genetic erosion; Genetic markers; Life-history traits; Natural selection and contemporary evolution.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00228/33964/33473.pdf
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Genetic characterization of ninety elite soybean cultivars using coefficient of parentage. Repositório Alice
MIRANDA, Z. de F.S.; ARIAS, C.A.A.; PRETE, C.E.C.; KIIHL, R.A. de S.; ALMEIDA, L.A. de; TOLEDO, J.F. de; DESTRO, D..
The objective of this work was to estimate the coefficient of parentage and to understand the genetic structure of 90 elite soybean cultivars, which are adapted to different Brazilian environments. A total of 4,005 coefficients of parentage (f) were obtained and used to group the cultivars by UPGMA method. The constructed dendrogram showed several related cultivar groups which shared similar ancestors and clearly showed the genetic structure of the main Brazilian cultivars. Effective population sizes (Ne) were also estimated for cultivars in different generations. The average f = 0.2124 value, obtained from cultivars classified into four decades according to the release year, suggested effective soybean population sizes of 11 and 13 calculated using...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Glycine max; Effective population size; Genetic similarity; Parentage coefficient; Similaridade genética; Tamanho efetivo populacional.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/123785
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Genetic characterization of ninety elite soybean cultivars using coefficient of parentage PAB
Miranda,Zilda de Fátima Sgobero; Arias,Carlos Alberto Arrabal; Prete,Cássio Egidio Cavenaghi; Kiihl,Romeu Afonso de Souza; Almeida,Leones Alves de; Toledo,José Francisco Ferraz de; Destro,Deonisio.
The objective of this work was to estimate the coefficient of parentage and to understand the genetic structure of 90 elite soybean cultivars, which are adapted to different Brazilian environments. A total of 4,005 coefficients of parentage (f) were obtained and used to group the cultivars by UPGMA method. The constructed dendrogram showed several related cultivar groups which shared similar ancestors and clearly showed the genetic structure of the main Brazilian cultivars. Effective population sizes (Ne) were also estimated for cultivars in different generations. The average f = 0.2124 value, obtained from cultivars classified into four decades according to the release year, suggested effective soybean population sizes of 11 and 13 calculated using...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Effective population size; Genetic similarity; Parentage coefficient.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000300009
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Genetic diversity assessment of the Mexican Simmental population through pedigree analysis R. Bras. Zootec.
Utrera,Ángel Ríos; Murillo,Vicente Eliezer Vega; Bermúdez,Moisés Montaño; Velázquez,Guillermo Martínez; Ponce,Sergio Iván Román.
ABSTRACT The purpose of this study was to examine the genetic variability of the Mexican Simmental. Inbreeding was calculated by year for animals born from 1985 to 2014. Proportion of ancestors known, average equivalent complete generations, generation interval, and effective size, as well as the effective numbers of founders, ancestors, and founder genomes were calculated for animals born in six periods (1985-1989, 1990-1994, 1995-1999, 2000-2004, 2005-2009, and 2010-2014). The year 1985 was selected as the initial year to form the subpopulations since the registration of the first Simmental cattle born in Mexico began in this year. Gene contributions of ancestors with the highest genetic influence were also calculated, using data of animals born in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Effective number of ancestors; Effective population size; Inbreeding; Marginal genetic contribution; Mexican Simmental cattle.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100404
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Genetic improvement and population structure of the Nelore breed in Northern Brazi. Repositório Alice
MALHADO, C. H. M.; CARNEIRO, P. L. S.; MALHADO, A. C. M.; MARTINS FILHO, R.; BOZZI, R.; LADLE, R. J..
Abstract ? The objective of this work was to evaluate the population structure and the genetic and phenotypic progress of Nelore cattle in Northern Brazil. Pedigree information concerning animals born between 1942 and 2006 were analyzed. Population structure was performed using the Endog program. average relatedness coefficients were low: 0.2 and 0.13%, respectively. However,The effective number of founders was 370 and the genetic contribution of 10, 50 and 448 most influent ancestors explained 13.2, 28 and 50% of the genetic variability in the population, respectively. The genetic variability for growth traits and population structure demonstrates high probability of increasing productivity through selective breeding. Moreover, management strategies to...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Effective population size; Genetic parameters; Genetic trends; Inbreeding; Pedigree analysis; Bos taurus indicus.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/877575
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Genetic improvement and population structure of the Nelore breed in Northern Brazil. Repositório Alice
MALHADO, C. H. M.; CARNEIRO, P. L. S.; MALHADO, A. C. M.; MARTINS FILHO, R.; BOZZI, R.; LADLE, R. J..
Abstract ? The objective of this work was to evaluate the population structure and the genetic and phenotypic progress of Nelore cattle in Northern Brazil. Pedigree information concerning animals born between 1942 and 2006 were analyzed. Population structure was performed using the Endog program. average relatedness coefficients were low: 0.2 and 0.13%, respectively. However,The effective number of founders was 370 and the genetic contribution of 10, 50 and 448 most influent ancestors explained 13.2, 28 and 50% of the genetic variability in the population, respectively. The genetic variability for growth traits and population structure demonstrates high probability of increasing productivity through selective breeding. Moreover, management strategies to...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Bos taurus indicus; Effective population size; Genetic parameters; Genetic trends; Pedigree analysis; Inbreeding.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/873351
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Genetic improvement and population structure of the Nelore breed in Northern Brazil PAB
Malhado,Carlos Henrique Mendes; Carneiro,Paulo Luiz Souza; Malhado,Ana Claudia Mendes; Martins Filho,Raimundo; Bozzi,Riccardo; Ladle,Richard James.
The objective of this work was to evaluate the population structure and the genetic and phenotypic progress of Nelore cattle in Northern Brazil. Pedigree information concerning animals born between 1942 and 2006 were analyzed. Population structure was performed using the Endog program. Out of the 140,628 animals studied, 67.7, 14.52 and 3.18% had complete pedigree record of the first, second and third parental generation, respectively. Inbreeding and average relatedness coefficients were low: 0.2 and 0.13%, respectively. However, these parameters may have been underestimated, since information on pedigree was incomplete. The effective number of founders was 370 and the genetic contribution of 10, 50 and 448 most influent ancestors explained 13.2, 28 and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bos taurus indicus; Effective population size; Genetic parameters; Genetic trends; Inbreeding; Pedigree analysis.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001000009
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Genetic parameters and estimated genetic gains in young rubber tree progenies PAB
Verardi,Cecília Khusala; Scaloppi Junior,Erivaldo José; Silva,Guilherme Augusto Peres; Gouvêa,Lígia Regina Lima; Gonçalves,Paulo de Souza.
The objective of this work was to assess the genetic parameters and to estimate genetic gains in young rubber tree progenies. The experiments were carried out during three years, in a randomized block design, with six replicates and ten plants per plot, in three representative Hevea crop regions of the state of São Paulo, Brazil. Twenty-two progenies were evaluated, from three to five years old, for rubber yield and annual girth growth. Genetic gain was estimated with the multi-effect index (MEI). Selection by progenies means provided greater estimated genetic gain than selection based on individuals, since heritability values of progeny means were greater than the ones of individual heritability, for both evaluated variables, in all the assessment years....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hevea brasiliensis; Annual girth growth; Early selection; Effective population size; Multi-effect index; Rubber yield.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000400009
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Genome-wide patterns of recombination, linkage disequilibrium and nucleotide diversity from pooled resequencing and single nucleotide polymorphism genotyping unlock the evolutionary history of Eucalyptus grandis. Repositório Alice
SILVA JUNIOR, O. B. da; GRATTAPAGLIA, D..
2015
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Ancestral recombination graphs; Effective population size; Linkage disequilibrium (LD); Mutation rate; Nucleotide diversity; Population recombination rate; Whole-genome pooled resequencing; Eucalyptus.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1031226
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Historia de vida y genética cuantitativa de cuatro poblaciones del cocodrilo de pantano (Crocodylus moreletii) bajo condiciones de cautiverio en el trópico mexicano. Colegio de Postgraduados
Serna Lagunes, Ricardo.
Se evaluó la variación morfológica, crecimiento corporal, estructura, variación genética y tamaño efectivo de población (Ne) de cuatro poblaciones de Crocodylus moreletii, manejadas en la UMA Cacahuatal, situada en Veracruz, México. La variación morfológica y el crecimiento corporal se evaluaron aplicando un análisis multivariado de covarianza (MANCOVA) y un análisis de varianza (ANOVA), respectivamente. La descripción de la estructura genética se realizó acorde a los principios de Hardy-Weinberg y se evaluó la variación genética con un análisis de varianza molecular (AMOVA), que se corroboró con los estadísticos F. El Ne se determinó a partir del total de cocodrilos reproductivos y se obtuvo la tasa de incremento de endogamia. La población de Villa Juárez...
Palavras-chave: Morfología; Crecimiento corporal; Estructura genética poblacional; Variación genética; Tamaño efectivo de población; Morphology; Body growth; Genetic structure; Genetic variation; Effective population size; Maestría; Agroecosistemas Tropicales.
Ano: 2010 URL: http://hdl.handle.net/10521/191
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Inbreeding evidence in a traditional channel catfish (Ictalurus punctatus) hatchery in Mexico Electron. J. Biotechnol.
Parra-Bracamonte,Gaspar Manuel; Sifuentes-Rincón,Ana María; Rosa-Reyna,Xochitl Fabiola De la; Arellano-Vera,Williams; Sosa-Reyes,Brenda.
Background: Channel catfish are one of the most important aquaculture species raised for food purposes in Mexico. Two temporal samples were obtained from the largest channel catfish breeding hatchery in Mexico to identify changes in genetic diversity and inbreeding that are promoted by traditional hatchery management. Results: The genetic parameter analysis of 11 microsatellite loci showed no significant change in genetic diversity (p &gt; 0.05). However, a significant heterozygosis deficiency was detected (p < 0.001), and genetic structure analysis indicated moderate differentiation between the temporally divided populations (F ST = 0.08). A moderate level of inbreeding and a slight increase of the inbreeding coefficient from 0.23 to 0.27 were the...
Tipo: Journal article Palavras-chave: Channel catfish; Effective population size; Genetic diversity; Inbreeding.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600011
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