Análise populacional genética de Larus dominicanus através do uso de microssatélites / Population genetic analysis of Larus dominicanus using microsatellites

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

07/02/2012

RESUMO

The changes in the coast that has been caused by human action has led to impacts on species associated with this environment. Larus dominicanus is a seabird species widely distributed throughout the Southern Hemisphere. The generalist feeding habits allow this species take advantage from human action, leading to population growth, which is also observed in other species of gulls. This study, through the use of microsatellite markers, shows that, despite of the population growth, Larus dominicanus has a low genetic variability, with low population structure, which probably reflects the recent origin of species and a recent differentiation among populations. Multiple forces act to determine the population structure, among them the isolation by distance, physical barriers and philopatry. Some colonies presents a bottleneck sign, raising the hypothesis of recent founder effects in the colonies to the north of Brazil and population reduction of colonies of Argentine and Antarctic as consequence of the last glaciation. These data show the need to consider genetic information for the implementation of management plans. The variability within populations must be maintained, since the differentiation between them is recent. Furthermore, the species population control by direct methods must also be accompanied by environmental management plans, to reduce or eliminate the conditions that favor the unbalanced growth of the gulls

ASSUNTO(S)

bottleneck estruturação populacional genética gaivotão gargalo populacional genetic variability kelp gulls larus dominicanus larus dominicanus microsatellites microssatélites population genetic structure variabilidade genética

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