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Multiple colonizations, in situ speciation, and volcanism-associated stepping-stone dispersals shaped the phylogeography of the Macaronesian red fescues (Festuca L., Gramineae)

2008Journal article Open access
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dc.contributor.authorDíaz-Pérez, Antonio
dc.contributor.authorSequeira, Miguel
dc.contributor.authorSantos-Guerra, Arnoldo
dc.contributor.authorCatalán, Pilar
dc.date.accessioned2022-04-01T13:44:40Z
dc.date.available2022-04-01T13:44:40Z
dc.date.issued2008
dc.description.abstractWhereas examples of insular speciation within the endemic-rich Macaronesian hotspot flora have been documented, the phylogeography of recently evolved plants in the region has received little attention. The Macaronesian red fescues constitute a narrow and recent radiation of four closely related diploid species distributed in the Canary Islands (F. agustinii), Madeira (F. jubata), and the Azores (F. francoi and F. petraea), with a single extant relative distributed in mainland southwest Europe (F. rivularis). Bayesian structure and priority consensus tree approaches and population spatial correla tions between genetic, geographical, and dispersal distances were used to elucidate the phylogeographical patterns of these grasses. Independent versus related origins and dispersal versus isolation by distance (IBD) hypotheses were tested to explain the genetic differentiation of species and populations, respectively. Genetic structure was found to be geographi cally distributed among the archipelagos and the islands endemics. The high number of shared AFLP fragments in all four species suggests a recent single origin from a continental Pliocene ancestor. However, the strong allelic structure detected among the Canarian, Madeiran, and Azorean endemics and the significant standardized residual values obtained from structured Bayesian analysis for pairwise related origin hypotheses strongly supported the existence of three independent continental-oceanic colonization events. The Canarian F. agustinii, the Madeiran F. jubata, and the two sister F. francoi and F. petraea Azorean species likely evolved from different continental founders in their respective archipelagos. Despite the short span of time elapsed since colonization, the two sympatric Azorean species probably diverged in situ, following eco logical adaptation, from a common ancestor that arrived from the near mainland. Simple dispersal hypotheses explained most of the genetic variation at the species level better than IBD models. The optimal dispersal model for F. agustinii was a bidirectional centripetal stepping-stone colonization pattern, an eastern-to-western volcanism-associated dispersion was fa vored for F. francoi, whereas for the recently derived F. petraea a counterintuitive direction of colonization (west-to-east) was suggested. The population-based phylogeographical trends deduced from our study could be used as predictive models for other Macaronesian plant endemics with similar distribution areas and dispersal abilities. [Bayesian genetic analyses; colonization of oceanic islands; dispersal models; Festuca sect. Aulaxyper; Macaronesia; phylogeography.]pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationDiaz-Perez, A., Sequeira, M., Santos-Guerra, A., & Catalan, P. (2008). Multiple colonizations, in situ speciation, and volcanism-associated stepping-stone dispersals shaped the phylogeography of the Macaronesian red fescues (Festuca L., Gramineae). Systematic Biology, 57(5), 732-749. https://doi.org/10.1080/10635150802302450pt_PT
dc.identifier.doi10.1080/10635150802302450pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4216
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherOxford University Presspt_PT
dc.relationEvolutionary relationships of Macaronesic Deschampsia Aveneae, Poaceae based on a morphological and molecular approaches.
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectRed Fescues (Festuca L., Gramineae)pt_PT
dc.subjectMacaronesiapt_PT
dc.subjectPhylogeographypt_PT
dc.subjectColonizationpt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências da Vidapt_PT
dc.titleMultiple colonizations, in situ speciation, and volcanism-associated stepping-stone dispersals shaped the phylogeography of the Macaronesian red fescues (Festuca L., Gramineae)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleEvolutionary relationships of Macaronesic Deschampsia Aveneae, Poaceae based on a morphological and molecular approaches.
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POCI/POCTI%2FBME%2F39640%2F2001/PT
oaire.citation.endPage749pt_PT
oaire.citation.issue5pt_PT
oaire.citation.startPage732pt_PT
oaire.citation.titleSystematic Biologypt_PT
oaire.citation.volume57pt_PT
oaire.fundingStreamPOCI
person.familyNameSequeira
person.givenNameMiguel
person.identifier.ciencia-idCA1C-1AC6-6346
person.identifier.orcid0000-0001-9728-465X
person.identifier.scopus-author-id35101791200
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication.latestForDiscoveryc4c52673-d265-42c0-b5bd-628a3b2f0b0b
relation.isProjectOfPublication583b1936-d26e-402f-8089-e9054a9558bd
relation.isProjectOfPublication.latestForDiscovery583b1936-d26e-402f-8089-e9054a9558bd

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