Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/4161
Título: Genetic diversity of a clonal angiosperm near its range limit: The case of Cymodocea nodosa at the Canary Islands
Autor: Alberto, F.
Arnaud-Haond, S.
Duarte, C. M.
Serrão, Ester
Palavras-chave: Seagrass
Cymodocea nodosa
Clonal plant
Island biogeography
Microsatellites
Genetic differentiation
Marine dispersal
Population gene flow
Data: 2006
Editora: Inter Research
Citação: Alberto, F.; Arnaud-Haond, S.; Duarte, C.M.; Serrão, E.A.Genetic diversity of a clonal angiosperm near its range limit: The case of Cymodocea nodosa at the Canary Islands, Marine Ecology Progress Series, 309, Março 2006, 117-129, 2006.
Resumo: The seagrass Cymodocea nodosa forms a unique community in the Canary Islands, where it is classified as an endangered species. Biogeographic theory predicts that clonal species on islands near their distributional limits might show lower proportions of sexual (versus clonal) reproduction, lower genetic diversity, and higher differentiation. We addressed these hypotheses by comparing the genetic structure of C. nodosa from 10 meadows in the 4 main Canary Islands with2Iberian sites (Atlantic and Mediterranean) using microsatellites. A resampling method was proposed to standardize, among samples, genetic variability statistics estimating genotypic richness (R) and allelic richness (Â). A high degree of genotypic richness at the Canary Islands (R = 0.30 – 0.94, mean = 0.67) relative to Iberian sites revealed that C. nodosa performs effective sexual reproduction here. In contrast, lower  suggested a founder effect during the colonization of the archipelago, and similar allelic composition across all islands indicated colonization from a single source. A hotspot of genetic diversity was observed in El Medano (Tenerife), probably associated with lower drift in this meadow, the largest of the archipelago. Predominant north-south surface currents and a greater distance to the mainland could explain lower allelic richness of 2 northwestern sites on different islands and greater similarity between them. All meadows were differentiated from each other and there was no correlation between genetic and geographic distances. This non-equilibrium migration-mutation system was therefore mostly influenced by diversity resulting from genetic drift, and less by the homogenizing effects of gene flow.
Peer review: yes
URI: http://hdl.handle.net/10400.1/4161
DOI: http://dx.doi.org/ 10.3354/meps309117
ISSN: 0171-8630
Versão do Editor: http://www.int-res.com/abstracts/meps/v309/p117-129/
Aparece nas colecções:CCM2-Artigos (em revistas ou actas indexadas)



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