Weak large-scale population genetic structure in a philopatric seabird, the European Shag Phalacrocorax aristotelis
Quantifying population genetic structure is fundamental to testing hypotheses regarding gene flow, population divergence and dynamics across large spatial scales. In species with highly mobile life-history stages, where it is unclear whether such movements translate into effective dispersal among di...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2011 |
| País: | España |
| Institución: | Universidad de Oviedo (UNIOVI) |
| Repositorio: | RUO. Repositorio Institucional de la Universidad de Oviedo |
| Idioma: | inglés |
| OAI Identifier: | oai:digibuo.uniovi.es:10651/9422 |
| Acceso en línea: | http://hdl.handle.net/10651/9422 https://dx.doi.org/10.1111/j.1474-919X.2011.01159.x |
| Access Level: | acceso abierto |
| Sumario: | Quantifying population genetic structure is fundamental to testing hypotheses regarding gene flow, population divergence and dynamics across large spatial scales. In species with highly mobile life-history stages, where it is unclear whether such movements translate into effective dispersal among discrete philopatric breeding populations, this approach can be particularly effective. We used seven nuclear microsatellite loci and mitochondrial DNA (ND2) markers to quantify population genetic structure and variation across 20 populations (447 individuals) of one such species, the European Shag, spanning a large geographical range. Despite high breeding philopatry, rare cross-sea movements and recognized subspecies, population genetic structure was weak across both microsatellites and mitochondrial markers. Furthermore, although isolation-by-distance was detected, microsatellite variation provided no evidence that open sea formed a complete barrier to effective dispersal. These data suggest that occasional long-distance, cross-sea movements translate into gene flow across a large spatial scale. Historical factors may also have shaped contemporary genetic structure: cluster analyses of microsatellite data identified three groups, comprising colonies at southern, mid- and northern latitudes, and similar structure was observed at mitochondrial loci. Only one private mitochondrial haplotype was found among subspecies, suggesting that this current taxonomic subdivision may not be mirrored by genetic isolation. Quantifying the pattern and scale of genetic variation within and among populations is essential for understanding relationships between population dynamics and genetic structure (Avise 2000, Runge et al. 2007). Such patterns can provide insights into gene flow across spatial and temporal scales that direct field measures of dispersal are rarely able to achieve, and thus improve understanding of the ecological and genetic dynamics of populations (Koenig et al. 1996). This is especially true for species with substantial known movement capabilities that may or may not translate into realized gene flow among breeding populations. |
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