Análises genéticas de carcaças de atobá marrom, Sula leucogaster (Boddaert, 1783), da região centro-norte do Estado do Rio de Janeiro

• Autor(a) principal: Aires, Rafaela Magalhães
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/5864
• topic: Genetic variability; Conservation; Seabirds; Variabilidade genética; Conservação; Aves marinhas; Ave marinha - Campus, Bacia de (RJ); CNPQ::CIENCIAS BIOLOGICAS::GENETICA

The region of Campos Basin is exposed to various anthropogenic activities that affect directly the behavior of marine ecosystem. The study of marine fauna in North-Central coast of Rio de Janeiro is of great importance, several marine and coastal birds live or spend most of their migratory period along the Campos Basin, between them is Sula leucogaster (Boddaert, 1783). Although these birds are highly mobile, their populations have a robust genetic population structure. In order to check the structure and evolutionary relationships of the population of Sula leucogaster in the Campos Basin, 91 stranding samples were collected, and the data of this region were compared with the published data. From the control region of mitochondrial DNA, 26 haplotypes were identified, all of them being unique to the Campos Basin. Most of these haplotypes were rare, only eight have common frequencies. The analyses show that the population of the Campos Basin is a genetic stock of Sula leucogaster. This fact can be attributed to the filopatric behavior and coastal habit of this species that prevents the gene flow between populations. Moreover, the population of the Campos Basin has low genetic variability and is possibly suffering a bottleneck effect or purifying selection, supported by Fu test values, which is common for species divided into subpopulations. The phylogenetic data demonstrates a recent contact between the populations of the Campos Basin and Ascensão island. The oceanographic conditions also influence the structuring of populations of Sula leucogaster populations, as the absence of barriers and geographical proximity could favor secondary contact with the Caribbean Sea, which was not evident in the analyzes. Thus, the low amount of gene flow and the low genetic variability are worrying factors for the maintenance of the population of brown boobies in this area of high environmental impact