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Vicariance patterns in the Mediterranean Sea: East-west cleavage and low dispersal in the endemic seagrass Posidonia oceanica

2007-06Journal article Restricted access
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dc.contributor.authorARNAUD-HAOND, Sophie
dc.contributor.authorMigliaccio, M.
dc.contributor.authorDiaz-Almela, E.
dc.contributor.authorTeixeira, Sara
dc.contributor.authorVan De Vliet, M. S.
dc.contributor.authorAlberto, F.
dc.contributor.authorProcaccini, G.
dc.contributor.authorDuarte, C. M.
dc.contributor.authorSerrão, Ester
dc.date.accessioned2014-06-03T09:54:26Z
dc.date.available2014-06-03T09:54:26Z
dc.date.issued2007-06
dc.date.updated2014-05-21T13:38:12Z
dc.description.abstractAim  The seagrass, Posidonia oceanica is a clonal angiosperm endemic to the Mediterranean Sea. Previous studies have suggested that clonal growth is far greater than sexual recruitment and thus leads to low clonal diversity within meadows. However, recently developed microsatellite markers indicate that there are many different genotypes, and therefore many distinct clones present. The low resolution of markers used in the past limited our ability to estimate clonality and assess the individual level. New high-resolution dinucleotide microsatellites now allow genetically distinct individuals to be identified, enabling more reliable estimation of population genetic parameters across the Mediterranean Basin. We investigated the biogeography and dispersal of P. oceanica at various spatial scales in order to assess the influence of different evolutionary factors shaping the distribution of genetic diversity in this species. Location  The Mediterranean. Methods  We used seven hypervariable microsatellite markers, in addition to the five previously existing markers, to describe the spatial distribution of genetic variability in 34 meadows spread throughout the Mediterranean, on the basis of an average of 35.6 (± 6.3) ramets sampled. Results  At the scale of the Mediterranean Sea as a whole, a strong east–west cleavage was detected (amova). These results are in line with those obtained using previous markers. The new results showed the presence of a putative secondary contact zone at the Siculo-Tunisian Strait, which exhibited high allelic richness and shared alleles absent from the eastern and western basins. F statistics (pairwise θ ranges between 0.09 and 0.71) revealed high genetic structure between meadows, both at a small scale (about 2 to 200 km) and at a medium scale within the eastern and western basins, independent of geographical distance. At the intrameadow scale, significant spatial autocorrelation in six out of 15 locations revealed that dispersal can be restricted to the scale of a few metres. Main conclusions  A stochastic pattern of effective migration due to low population size, turnover and seed survival is the most likely explanation for this pattern of highly restricted gene flow, despite the importance of an a priori seed dispersal potential. The east–west cleavage probably represents the outline of vicariance caused by the last Pleistocene ice age and maintained to this day by low gene flow. These results emphasize the diversity of evolutionary processes shaping the genetic structure at different spatial scales.por
dc.identifier.citationArnaud-Haond, S.; Migliaccio, M.; Diaz-Almela, E.; Teixeira, S.; Van De Vliet, M.S.; Alberto, F.; Procaccini, G.; Duarte, C.M.; Serrão, E.A.Vicariance patterns in the Mediterranean Sea: East-west cleavage and low dispersal in the endemic seagrass Posidonia oceanica, Journal of Biogeography, 34, 6, 963-976, 2007.por
dc.identifier.doihttp://dx.doi.org/ 10.1111/j.1365-2699.2006.01671.x
dc.identifier.issn0305-0270
dc.identifier.otherAUT: ESE00527;
dc.identifier.urihttp://hdl.handle.net/10400.1/4154
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherWileypor
dc.relation.publisherversionhttp://onlinelibrary.wiley.com/doi/10.1111/j.1365-2699.2006.01671.x/abstractpor
dc.subjectClonal plantpor
dc.subjectContact zonepor
dc.subjectGenetic divergencepor
dc.subjectGlaciationspor
dc.subjectMediterranean biogeographypor
dc.subjectMicrosatellitespor
dc.subjectPleistocenepor
dc.subjectPosidonia oceanica speciationpor
dc.titleVicariance patterns in the Mediterranean Sea: East-west cleavage and low dispersal in the endemic seagrass Posidonia oceanicapor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage976por
oaire.citation.issue6por
oaire.citation.startPage963por
oaire.citation.titleJournal of Biogeographypor
oaire.citation.volume34por
person.familyNameARNAUD-HAOND
person.familyNameTeixeira
person.familyNameAlberto
person.familyNameSerrao
person.givenNameSophie
person.givenNameSara
person.givenNameFilipe
person.givenNameEster A.
person.identifier1488456
person.identifierC-6686-2012
person.identifier.ciencia-id5A15-FF67-4075
person.identifier.ciencia-idBD15-2AC7-8AA3
person.identifier.ciencia-id5B13-B26E-B1EC
person.identifier.orcid0000-0001-5814-8452
person.identifier.orcid0000-0003-0419-2348
person.identifier.orcid0000-0003-0593-3240
person.identifier.orcid0000-0003-1316-658X
person.identifier.ridM-3424-2013
person.identifier.scopus-author-id6602532118
person.identifier.scopus-author-id23986333100
person.identifier.scopus-author-id6701653422
person.identifier.scopus-author-id7004093604
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication2b10c79a-8ca9-4449-ba02-0c240f00d921
relation.isAuthorOfPublicationb461f1bb-dfdb-410f-b579-647fa97957ca
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relation.isAuthorOfPublication45ccfe90-155c-4d6f-9e86-8f0fd064005f
relation.isAuthorOfPublication.latestForDiscovery45ccfe90-155c-4d6f-9e86-8f0fd064005f

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