| Texto completo | |
| Autor(es): |
Santos, Fernanda de Almeida
;
Morgante, Joao Stenghel
;
Frere, Esteban
;
Millones, Ana
;
Sander, Martin
;
Vianna, Juliana de Abreu
;
de Mendonca Dantas, Gisele Pires
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF ORNITHOLOGY; v. 157, n. 4, p. 11-pg., 2016-10-01. |
| Resumo | |
The high dispersal ability of seabirds and the absence of geographical barriers has led to high gene flow and reduced population differentiation. Nevertheless, some species with philopatric behavior have restricted gene flow among colonies, revealing a strong population structure. Gulls show widespread colonial behavior, and are long-lived species, which make them a good model for understanding evolutionary processes in seabirds. Previous genetic studies on the Kelp Gull (Larus dominicanus) have revealed low genetic variability in mitochondrial markers but relatively high genetic variation in a nuclear marker. These observations can be explained by the occurrence of a selective sweep on mtDNA, population genetic bottlenecks or a recent origin of the species. We used microsatellite data to further investigate these hypotheses, mainly by testing for bottleneck events. Low genetic variability (H (o) = 0.276-0.570) was detected in Kelp Gulls. However, population genetic structure was observed among regions (Chile, Argentina and Brazil), and between continents (South America and Antarctica). The population of the Kelp Gull in South America may have differentiated due to isolation by distance (r = 0.7273, p = 0.0013), whereas the population in the Antarctic seems to be isolated by non-physical barriers. Bottleneck events were detected in 6 out of 14 colonies studied. These colonies are at the limits of the distribution of the Kelp Gull, and thus experience harsh survival conditions. We believe that the Kelp Gull has a complex history in the southern hemisphere, with a recent origin, followed by bottlenecks and then population expansion. Thus, the genetic diversity found in Kelp Gull is similar to that observed for other species of Laridae. (AU) | |
| Processo FAPESP: | 05/55438-4 - Filogeografia de vertebrados neotropicais: padrões de variação, inferências de processos evolutivos e implicações para a conservação biológica |
| Beneficiário: | João Stenghel Morgante |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 03/01599-1 - Biologia reprodutiva, estrutura populacional e variabilidade genética de Larus dominicanus |
| Beneficiário: | Gisele Pires de Mendonça Dantas |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 06/61023-4 - Determinacao da estrutura populacional de larus dominicanus na costa brasileira atraves do uso de microssatelites. |
| Beneficiário: | Fernanda de Almeida Santos |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |