Genetic diversity of a clonal angiosperm near its range limit: The case of Cymodocea nodosa at the Canary Islands
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.1/4161 |
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. |
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Genetic diversity of a clonal angiosperm near its range limit: The case of Cymodocea nodosa at the Canary IslandsSeagrassCymodocea nodosaClonal plantIsland biogeographyMicrosatellitesGenetic differentiationMarine dispersalPopulation gene flowThe 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.Inter ResearchSapientiaAlberto, F.ARNAUD-HAOND, SophieDuarte, C. M.Serrão, Ester2014-06-03T13:13:33Z20062014-05-21T13:39:33Z2006-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/4161engAlberto, 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, 2006.0171-8630AUT: ESE00527;http://dx.doi.org/ 10.3354/meps309117info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-24T10:15:15Zoai:sapientia.ualg.pt:10400.1/4161Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:57:32.458992Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Genetic diversity of a clonal angiosperm near its range limit: The case of Cymodocea nodosa at the Canary Islands |
title |
Genetic diversity of a clonal angiosperm near its range limit: The case of Cymodocea nodosa at the Canary Islands |
spellingShingle |
Genetic diversity of a clonal angiosperm near its range limit: The case of Cymodocea nodosa at the Canary Islands Alberto, F. Seagrass Cymodocea nodosa Clonal plant Island biogeography Microsatellites Genetic differentiation Marine dispersal Population gene flow |
title_short |
Genetic diversity of a clonal angiosperm near its range limit: The case of Cymodocea nodosa at the Canary Islands |
title_full |
Genetic diversity of a clonal angiosperm near its range limit: The case of Cymodocea nodosa at the Canary Islands |
title_fullStr |
Genetic diversity of a clonal angiosperm near its range limit: The case of Cymodocea nodosa at the Canary Islands |
title_full_unstemmed |
Genetic diversity of a clonal angiosperm near its range limit: The case of Cymodocea nodosa at the Canary Islands |
title_sort |
Genetic diversity of a clonal angiosperm near its range limit: The case of Cymodocea nodosa at the Canary Islands |
author |
Alberto, F. |
author_facet |
Alberto, F. ARNAUD-HAOND, Sophie Duarte, C. M. Serrão, Ester |
author_role |
author |
author2 |
ARNAUD-HAOND, Sophie Duarte, C. M. Serrão, Ester |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Sapientia |
dc.contributor.author.fl_str_mv |
Alberto, F. ARNAUD-HAOND, Sophie Duarte, C. M. Serrão, Ester |
dc.subject.por.fl_str_mv |
Seagrass Cymodocea nodosa Clonal plant Island biogeography Microsatellites Genetic differentiation Marine dispersal Population gene flow |
topic |
Seagrass Cymodocea nodosa Clonal plant Island biogeography Microsatellites Genetic differentiation Marine dispersal Population gene flow |
description |
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. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006 2006-01-01T00:00:00Z 2014-06-03T13:13:33Z 2014-05-21T13:39:33Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.1/4161 |
url |
http://hdl.handle.net/10400.1/4161 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
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. 0171-8630 AUT: ESE00527; http://dx.doi.org/ 10.3354/meps309117 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Inter Research |
publisher.none.fl_str_mv |
Inter Research |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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