Genetic characterization of broad-snouted caiman (Caiman latirostris) populations by microsatellites markers. / Caracterização genética de populações de jacaré-de-papo-amarelo (Caiman latirostris), utilizando marcadores microssatélites.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

A component considered critical for the managment well succeed of wild populations it is the maintenance of genetic variation. In the intention of evaluating the extend and the distribution of the existent genetic variability in populations of Caiman latirostris, nine populations distributed along the latitudinal axis of the distribution of the species in Brazil and a population in captivity they were studied with aid of eleven locos microsatellite. The genic mean diversity (He=h) and the observed mean heterozygosity (Ho) across all loci for all populations ranged from 0,628 and 0,567, respectively, denoting existence high genetic variability. The population from São Paulo being in the intermediate zone of geographical distribution in Brazil doesn t possess the largest genetic variability. The value dear FST was 0,270 and RST it was 0,342. Both differentiation measures among the populations were significant (P <0,05). The higher estimates of FST and RST suggested a absence or low gene flow among those populations, exception done between the populations of Natal (RN) and João Pessoa (PB), where there was not significant differentiation among the populations, suggesting a gene flow pattern among them, fact confirmed by the related coefficient. It could be concluded in this work that the genetic distance among the population of the coast is affected by the existence of the Mountain of the Sea as geographical barrier for the fact of this population to present the largest genetic differentiations and not to group the any population for the grouping method UPGMA, same being close of the populations from São Paulo. The genetic distance among the populations seems not to accompany the geographical distance, in terms of latitudinal gradient (r=0,206). However when we removed the population of Cardoso s Island this correlation it increases significantly (r= 0,540), indicating there to be a certain space pattern of the genetic variability among the populations. The medium coefficient of related was low among and inside of the studied populations. With these results we can begin to understand the dynamics and it structures social of populations of Caiman latirostris.

ASSUNTO(S)

distribuição geográfica animal jacaré-de-papo-amarelo marcador molecular broad-snouted caiman animal geographical distribution genética animal animal ecology animal protection variação genética animal reproduction reprodução animal populações animais proteção animal economia animal animal populations molecular marker animal genetics

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