Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.7/401
Título: On some genetic consequences of social structure, mating systems, dispersal, and sampling
Autor: Parreira, Bárbara R.
Chikhi, Lounès
Palavras-chave: sociality
social structure
mating system
genotypic diversity
inbreeding avoidance
Data: 30-Jun-2015
Editora: National Academy of Sciences
Citação: Bárbara R. Parreira and Lounès Chikhi On some genetic consequences of social structure, mating systems, dispersal, and sampling PNAS 2015 112 (26) E3318-E3326; published ahead of print June 16, 2015, doi:10.1073/pnas.1414463112
Resumo: Many species are spatially and socially organized, with complex social organizations and dispersal patterns that are increasingly documented. Social species typically consist of small age-structured units, where a limited number of individuals monopolize reproduction and exhibit complex mating strategies. Here, we model social groups as age-structured units and investigate the genetic consequences of social structure under distinct mating strategies commonly found in mammals. Our results show that sociality maximizes genotypic diversity, which contradicts the belief that social groups are necessarily subject to strong genetic drift and at high risk of inbreeding depression. Social structure generates an excess of genotypic diversity. This is commonly observed in ecological studies but rarely reported in population genetic studies that ignore social structure. This heterozygosity excess, when detected, is often interpreted as a consequence of inbreeding avoidance mechanisms, but we show that it can occur even in the absence of such mechanisms. Many seemly contradictory results from ecology and population genetics can be reconciled by genetic models that include the complexities of social species. We find that such discrepancies can be explained by the intrinsic properties of social groups and by the sampling strategies of real populations. In particular, the number of social groups and the nature of the individuals that compose samples (e.g., nonreproductive and reproductive individuals) are key factors in generating outbreeding signatures. Sociality is an important component of population structure that needs to be revisited by ecologists and population geneticists alike.
Peer review: yes
URI: http://hdl.handle.net/10400.7/401
DOI: 10.1073/pnas.1414463112
Versão do Editor: http://www.pnas.org/content/112/26/E3318.abstract
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