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Registros recuperados: 6
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Invasive north american Beaver (Castor canadensis): the distribution of mitochondrial variation across the archipelago of Tierra del Fuego Mastozool. neotrop.
Fasanella,Mariana; Poljak,Sebastián; Lizarralde,Marta S..
In 1946 twenty-five pairs of Castor canadensis were introduced into the Isla Grande of Tierra del Fuego (Argentina). Thanks both to environmental conditions favorable for colonization and an absence of effective control measures, today the estimated abundance is about 100 000 individuals. We have conducted molecular analysis of beavers from three areas of the Archipelago of Tierra del Fuego, in order to characterize the genetic structure of the invasive population. Our results from AMOVA (Fst= 0.104, p < 0.001) suggest that geographical barriers and large distances could limit gene flow among the populations. In the Tierra del Fuego National Park subpopulation, we found a positive and significant autocorrelation out to 800 m (r = 0.193, p = 0.003) and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: D-loop; Invasive species; Spatial genetic structure; Tierra del Fuego.
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832010000100005
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Paternity analysis, pollen flow, and spatial genetic structure of a natural population of Euterpe precatoria in the Brazilian Amazon. Repositório Alice
FERREYRA RAMOS, S. L.; DEQUIGIOVANNI, G.; SEBBENN, A. M.; LOPES, M. T. G.; MACEDO, J. L. V. de; VEASEY, E. A.; ALVES-PEREIRA, A.; SILVA, P. P. da; GARCIA, J. N.; KAGEYAMA, P. Y..
Euterpe precatoria, known as açaí do Amazonas, is a regionally important palm of the Amazon rainforest for the fruit production through extractive agriculture. Little information is available with regard to genetic diversity, gene flow, and spatial genetic structure (SGS) of açaí populations, which are essential for the use, management, and conservation of genetic resources of the species. This research aimed to assess the genetic diversity, inbreeding level, SGS, and gene flow in four ontogenetic stages of a natural E. precatoria population in the Brazilian Amazon, based on 18 microsatellite loci. The study was carried out in a natural population dispersed in an area of about 10 ha.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Açaí do Amazonas; Coancestry coefficient; Paternity analysis; Spatial genetic structure; Gene flow.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1098739
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Pollen and seed flow patterns of Carapa guianensis Aublet. (Meliaceae) in two types of Amazonian forest Genet. Mol. Biol.
Martins,Karina; Raposo,Andréa; Klimas,Christie A; Veasey,Elizabeth A; Kainer,Karen; Wadt,Lúcia Helena O.
Various factors affect spatial genetic structure in plant populations, including adult density and primary and secondary seed dispersal mechanisms. We evaluated pollen and seed dispersal distances and spatial genetic structure of Carapa guianensis Aublet. (Meliaceae) in occasionally inundated and terra firme forest environments that differed in tree densities and secondary seed dispersal agents. We used parentage analysis to obtain contemporary gene flow estimates and assessed the spatial genetic structure of adults and juveniles. Despite the higher density of adults (diameter at breast height ; 25 cm) and spatial aggregation in occasionally inundated forest, the average pollen dispersal distance was similar in both types of forest (195 ± 106min terra...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gene flow; Parentage analysis; Scatterhoarding; Seed dispersal; Spatial genetic structure.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000500017
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Spatial and temporal population genetic variation and structure of Nothotsuga longibracteata (Pinaceae), a relic conifer species endemic to subtropical China Genet. Mol. Biol.
Qiu,Yingjun; Liu,Yifei; Kang,Ming; Yi,Guanmei; Huang,Hongwen.
Nothotsuga longibracteata, a relic and endangered conifer species endemic to subtropical China, was studied for examining the spatial-temporal population genetic variation and structure to understand the historical biogeographical processes underlying the present geographical distribution. Ten populations were sampled over the entire natural range of the species for spatial analysis, while three key populations with large population sizes and varied age structure were selected for temporal analyses using both nuclear microsatellites (nSSR) and chloroplast microsatellites (cpSSR). A recent bottleneck was detected in the natural populations of N. longibracteata. The spatial genetic analysis showed significant population genetic differentiation across its...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gene flow; Glacial refugia; Nothotsuga longibracteata; Spatial genetic structure; Temporal genetic structure.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000400019
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SSR-based analysis of clonality, spatial genetic structure and introgression from the Lombardy poplar into a natural population of Populus nigra L. along the Loire River ArchiMer
Chenault, Nicolas; Arnaud-haond, Sophie; Juteau, Mary; Valade, Romain; Almeida, Jose-luis; Villar, Marc; Bastien, Catherine; Dowkiw, Arnaud.
A scarcity of favourable habitats and introgression from exotic cultivars are two major threats to black poplars (Populus nigra L.) in Europe. Natural vegetative propagation contributes to maintenance of the species in areas where seedling recruitment is limited. Exhaustive sampling of all mature trees in a natural P. nigra stand (413 individuals at recorded positions), genotyping at 11 SSR loci, and a standardized analysis framework resulted in a precise description of clonality in terms of (a) frequency, (b) spatial growth form, and (c) impacts on the overall spatial genetic structure (SGS). The high proportion of replicated genotypes detected resulted in a genotypic richness (R) of 0.47. Up to 18 ramets were found per multilocus lineage (MLL), but 95%...
Tipo: Text Palavras-chave: Populus nigra; Lombardy poplar; Clonality; Spatial genetic structure; Introgression; Clonal growth form.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00065/17617/18016.pdf
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Variabilidade no cpDNA em Manilkara huberi, espécie sob manejo sustentável na Amazônia brasileira. Repositório Alice
AZEVEDO, V.C.R.; KANASHIRO, M.; GRATTAPAGLIA, D.; CIAMPI, A.Y..
O objetivo deste trabalho foi avaliar a existência de estruturação genética matrilinear em maçaranduba (Manilkara huberi). Foram avaliados 481 indivíduos adultos de M. huberi, distribuídos em 200 hectares de uma população natural na Floresta Nacional do Tapajós, Belterra, PA, e 88 regenerantes, com base na análise de nove microssatélites de cloroplasto e, de 96 indivíduos adultos, selecionados aleatoriamente na área de 200 ha, foi realizado o seqüenciamento de três regiões não codificadoras de cpDNA. Não foi detectado polimorfismo de seqüência. A análise da variabilidade haplotípica mostrou polimorfismo relativamente limitado, que resultou em 15 haplótipos, com diversidade genética total (hT) de 0,898. Foi detectada a existência de estruturação genética...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Conservação; Estruturação genética espacial; Maçaranduba; Manejo; Microssatélite; Seqüenciamento; Conservation; Spatial genetic structure; Maçaranduba; Management; Microsatellite; Sequencing.
Ano: 2008 URL: http://www.alice.cnptia.embrapa.br/handle/doc/122105
Registros recuperados: 6
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