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Cryptic diversity, geographical endemism and allopolyploidy in NE Pacific seaweeds

dc.contributor.authorNeiva, J.
dc.contributor.authorSerrão, Ester
dc.contributor.authorAnderson, Laura
dc.contributor.authorRaimondi, Peter T.
dc.contributor.authorMartins, Neusa
dc.contributor.authorGouveia, Licínia
dc.contributor.authorPaulino, Cristina
dc.contributor.authorCoelho, Nelson C.
dc.contributor.authorMiller, Kathy A.
dc.contributor.authorReed, Daniel C.
dc.contributor.authorLadah, Lydia
dc.contributor.authorPearson, G. A.
dc.date.accessioned2017-01-26T12:01:33Z
dc.date.available2017-01-26T12:01:33Z
dc.date.issued2017-01-23
dc.date.updated2017-01-23T17:03:06Z
dc.description.abstractBackground Molecular markers are revealing a much more diverse and evolutionarily complex picture of marine biodiversity than previously anticipated. Cryptic and/or endemic marine species are continually being found throughout the world oceans, predominantly in inconspicuous tropical groups but also in larger, canopy-forming taxa from well studied temperate regions. Interspecific hybridization has also been found to be prevalent in many marine groups, for instance within dense congeneric assemblages, with introgressive gene-flow being the most common outcome. Here, using a congeneric phylogeographic approach, we investigated two monotypic and geographically complementary sister genera of north-east Pacific intertidal seaweeds (Hesperophycus and Pelvetiopsis), for which preliminary molecular tests revealed unexpected conflicts consistent with unrecognized cryptic diversity and hybridization. Results The three recovered mtDNA clades did not match a priori species delimitations. H. californicus was congruent, whereas widespread P. limitata encompassed two additional narrow-endemic species from California - P. arborescens (here genetically confirmed) and P. hybrida sp. nov. The congruence between the genotypic clusters and the mtDNA clades was absolute. Fixed heterozygosity was apparent in a high proportion of loci in P. limitata and P. hybrida, with genetic analyses showing that the latter was composed of both H. californicus and P. arborescens genomes. All four inferred species could be distinguished based on their general morphology. Conclusions This study confirmed additional diversity and reticulation within NE Pacific Hesperophycus/Pelvetiopsis, including the validity of the much endangered, modern climatic relict P. arborescens, and the identification of a new, stable allopolyploid species (P. hybrida) with clearly discernable ancestry (♀ H. californicus x ♂ P. arborescens), morphology, and geographical distribution. Allopolyploid speciation is otherwise completely unknown in brown seaweeds, and its unique occurrence within this genus (P. limitata possibly representing a second example) remains enigmatic. The taxonomic separation of Hesperophycus and Pelvetiopsis is not supported and the genera should be synonymized; we retain only the latter. The transitional coastline between Point Conception and Monterey Bay represented a diversity hotspot for the genus and the likely sites of extraordinary evolutionary events of allopolyploid speciation at sympatric range contact zones. This study pinpoints how much diversity (and evolutionary processes) potentially remains undiscovered even on a conspicuous seaweed genus from the well-studied Californian intertidal shores let alone in other, less studied marine groups and regions/depths.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBMC Evolutionary Biology. 2017 Jan 23;17(1):30pt_PT
dc.identifier.doihttp://dx.doi.org/10.1186/s12862-017-0878-2pt_PT
dc.identifier.otherAUT: ESE00527;
dc.identifier.urihttp://hdl.handle.net/10400.1/8980
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherBioMed Centralpt_PT
dc.rights.holderThe Author(s).
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectAllopolyploidypt_PT
dc.subjectCongeneric phylogeographypt_PT
dc.subjectCryptic speciespt_PT
dc.subjectEndemismpt_PT
dc.subjectFucaceaept_PT
dc.subjectHesperophycuspt_PT
dc.subjectHybridizationpt_PT
dc.subjectIntertidalpt_PT
dc.subjectNE Pacificpt_PT
dc.subjectPelvetiopsispt_PT
dc.titleCryptic diversity, geographical endemism and allopolyploidy in NE Pacific seaweedspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issue1pt_PT
oaire.citation.titleBMC Evolutionary Biologypt_PT
oaire.citation.volume17pt_PT
person.familyNameMiranda Neiva
person.familyNameSerrao
person.familyNamePaulino
person.familyNameCoelho
person.familyNamePearson
person.givenNameJoão
person.givenNameEster A.
person.givenNameCristina
person.givenNameNelson
person.givenNameGareth Anthony
person.identifierM-3818-2013
person.identifierC-6686-2012
person.identifier113536
person.identifier.ciencia-id191B-5464-41F5
person.identifier.ciencia-id5B13-B26E-B1EC
person.identifier.ciencia-id1D1A-4459-86D8
person.identifier.ciencia-id1C1E-B852-4086
person.identifier.ciencia-id3315-9919-1A52
person.identifier.orcid0000-0002-5927-4570
person.identifier.orcid0000-0003-1316-658X
person.identifier.orcid0000-0003-4333-2905
person.identifier.orcid0000-0001-8637-545X
person.identifier.orcid0000-0002-8331-5889
person.identifier.orcid0000-0002-0768-464X
person.identifier.ridM-4126-2013
person.identifier.ridJ-3911-2013
person.identifier.scopus-author-id54895771800
person.identifier.scopus-author-id7004093604
person.identifier.scopus-author-id55892980300
person.identifier.scopus-author-id26029686700
person.identifier.scopus-author-id55916875600
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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