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| Registros recuperados: 117 | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 < 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 117 | |
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