Titre:	Genetic and morphometric divergence of an invasive bird : the introduced house sparrow (Passer domesticus) in Brazil
Auteur(s):	Lima, Marcos R. Macedo, Regina Helena Ferraz Martins, Thaís L. F. Schrey, Aaron W. Martin, Lynn B. Bensch, Staffan
Assunto::	Pássaro Pássaro - evolução (Biologia) Genética animal
Date de publication:	28-déc-2012
Editeur:	Plos One
Référence bibliographique:	LIMA, Marcos R. et al. Genetic and morphometric divergence of an invasive bird: the introduced house sparrow (Passer domesticus) in Brazil. Plos One, v. 7, n. 12, Article e53332, 28 dez. 2012. Disponível em: <http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0053332>. Acesso em: 22 jun. 2017. doi: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0053332.
Abstract:	Introduced species are interesting systems for the study of contemporary evolution in new environments because of their spatial and temporal scales. For this study we had three aims: (i) to determine how genetic diversity and genetic differentiation of introduced populations of the house sparrow (Passer domesticus) in Brazil varies with range expansion, (ii) to determine how genetic diversity and differentiation in Brazil compares to ancestral European populations; and (iii) to determine whether selection or genetic drift has been more influential on phenotypic divergence. We used six microsatellite markers to genotype six populations from Brazil and four populations from Europe. We found slightly reduced levels of genetic diversity in Brazilian compared to native European populations. However, among introduced populations of Brazil, we found no association between genetic diversity and time since introduction. Moreover, overall genetic differentiation among introduced populations was low indicating that the expansion took place from large populations in which genetic drift effects would likely have been weak. We found significant phenotypic divergence among sites in Brazil. Given the absence of a spatial genetic pattern, divergent selection and not genetic drift seems to be the main force behind most of the phenotypic divergence encountered. Unravelling whether microevolution (e.g., allele frequency change), phenotypic plasticity, or both mediated phenotypic divergence is challenging and will require experimental work (e.g., common garden experiments or breeding programs).
Licença::	Copyright: 2012 Lima et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
DOI:	https://dx.doi.org/10.1371/journal.pone.0053332
Collection(s) :	Artigos publicados em periódicos e afins

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