dc.contributor.author	Neiva, J.
dc.contributor.author	Pearson, G. A.
dc.contributor.author	Valero, Myriam
dc.contributor.author	Serrão, Ester
dc.date.accessioned	2012-11-23T11:47:35Z
dc.date.available	2012-11-23T11:47:35Z
dc.date.issued	2012-06-06
dc.date.updated	2012-10-30T07:07:32Z
dc.description.abstract	Factors promoting the emergence of sharp phylogeographic breaks include restricted dispersal, habitat discontinuity, physical barriers, disruptive selection, mating incompatibility, genetic surfing and secondary contact. Disentangling the role of each in any particular system can be difficult, especially when species are evenly distributed across transition zones and dispersal barriers are not evident. The estuarine seaweed Fucus ceranoides provides a good example of highly differentiated populations along its most persistent distributional range at the present rear edge of the species distribution, in NW Iberia. Intrinsic dispersal restrictions are obvious in this species, but have not prevented F. ceranoides from vastly expanding its range northwards following the last glaciation, implying that additional factors are responsible for the lack of connectivity between neighbouring southern populations. In this study we analyze 22 consecutive populations of F. ceranoides along NW Iberia to investigate the processes generating and maintaining the observed high levels of regional genetic divergence. Results Variation at seven microsatellite loci and at mtDNA spacer sequences was concordant in revealing that Iberian F. ceranoides is composed of three divergent genetic clusters displaying nearly disjunct geographical distributions. Structure and AFC analyses detected two populations with an admixed nuclear background. Haplotypic diversity was high in the W sector and very low in the N sector. Within each genetic cluster, population structure was also pervasive, although shallower. Conclusions The deep divergence between sectors coupled with the lack of support for a role of oceanographic barriers in defining the location of breaks suggested 1) that the parapatric genetic sectors result from the regional reassembly of formerly vicariant sub-populations, and 2) that the genetic discontinuities at secondary contact zones (and elsewhere) are maintained despite normal migration rates. We conclude that colonization and immigration, as sources of gene-flow, have very different genetic effects. Migration between established populations is effectively too low to prevent their differentiation by drift or to smooth historical differences inherited from the colonization process. F. ceranoides, but possibly low-dispersal species in general, appear to be unified to a large extent by historical, non-equilibrium processes of extinction and colonization, rather than by contemporary patterns of gene flow.	por
dc.description.version	info:eu-repo/semantics/publishedVersion
dc.identifier.citation	BMC Evolutionary Biology. 2012 Jun 06;12(1):78	por
dc.identifier.doi	http://dx.doi.org/10.1186/1471-2148-12-78
dc.identifier.other	AUT: ESE00527;
dc.identifier.uri	http://hdl.handle.net/10400.1/1873
dc.language.iso	eng	por
dc.language.rfc3066	eng
dc.peerreviewed	yes	por
dc.publisher	BioMed Central	por
dc.rights.holder	João Neiva et al.; licensee BioMed Central Ltd.
dc.title	Fine-scale genetic breaks driven by historical rangedynamics and ongoing density-barrier effects in theestuarine seaweed Fucus ceranoides L.	por
dc.type	journal article
dspace.entity.type	Publication
oaire.awardURI	info:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FAAC-CLI%2F109108%2F2008/PT
oaire.citation.issue	1:78	por
oaire.citation.title	BMC Evolutionary Biology	por
oaire.citation.volume	12	por
oaire.fundingStream	3599-PPCDT
person.familyName	Miranda Neiva
person.familyName	Pearson
person.familyName	Serrao
person.givenName	João
person.givenName	Gareth Anthony
person.givenName	Ester A.
person.identifier	M-3818-2013
person.identifier	113536
person.identifier	C-6686-2012
person.identifier.ciencia-id	191B-5464-41F5
person.identifier.ciencia-id	3315-9919-1A52
person.identifier.ciencia-id	5B13-B26E-B1EC
person.identifier.orcid	0000-0002-5927-4570
person.identifier.orcid	0000-0002-0768-464X
person.identifier.orcid	0000-0003-1316-658X
person.identifier.rid	J-3911-2013
person.identifier.scopus-author-id	54895771800
person.identifier.scopus-author-id	55916875600
person.identifier.scopus-author-id	7004093604
project.funder.identifier	http://doi.org/10.13039/501100001871
project.funder.name	Fundação para a Ciência e a Tecnologia
rcaap.rights	openAccess	por
rcaap.type	article	por
relation.isAuthorOfPublication	9e246701-725f-473c-afbd-6ec7cd92d759
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Fine-scale genetic breaks driven by historical rangedynamics and ongoing density-barrier effects in theestuarine seaweed Fucus ceranoides L.

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