Polyploidy on Islands: Its Emergence and Importance for Diversification

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dc.citation.volume12
dc.contributor.authorMeudt H
dc.contributor.authorDirk A
dc.contributor.authorTanentzap A
dc.contributor.authorIgea J
dc.contributor.authorNewmarch S
dc.contributor.authorBrandt A
dc.contributor.authorLee W
dc.contributor.authorTate J
dc.date.available2021-03-04
dc.date.available2021-02-11
dc.date.issued2021-03-04
dc.descriptionPublished source must be acknowledged with citation Copyright must be acknowledged First publication by Frontiers Media must be acknowledged
dc.description.abstractWhole genome duplication or polyploidy is widespread among floras globally, but traditionally has been thought to have played a minor role in the evolution of island biodiversity, based on the low proportion of polyploid taxa present. We investigate five island systems (Juan Fernández, Galápagos, Canary Islands, Hawaiian Islands, and New Zealand) to test whether polyploidy (i) enhances or hinders diversification on islands and (ii) is an intrinsic feature of a lineage or an attribute that emerges in island environments. These island systems are diverse in their origins, geographic and latitudinal distributions, levels of plant species endemism (37% in the Galapagos to 88% in the Hawaiian Islands), and ploidy levels, and taken together are representative of islands more generally. We compiled data for vascular plants and summarized information for each genus on each island system, including the total number of species (native and endemic), generic endemicity, chromosome numbers, genome size, and ploidy levels. Dated phylogenies were used to infer lineage age, number of colonization events, and change in ploidy level relative to the non-island sister lineage. Using phylogenetic path analysis, we then tested how the diversification of endemic lineages varied with the direct and indirect effects of polyploidy (presence of polyploidy, time on island, polyploidization near colonization, colonizer pool size) and other lineage traits not associated with polyploidy (time on island, colonizer pool size, repeat colonization). Diploid and tetraploid were the most common ploidy levels across all islands, with the highest ploidy levels (>8x) recorded for the Canary Islands (12x) and New Zealand (20x). Overall, we found that endemic diversification of our focal island floras was shaped by polyploidy in many cases and certainly others still to be detected considering the lack of data in many lineages. Polyploid speciation on the islands was enhanced by a larger source of potential congeneric colonists and a change in ploidy level compared to overseas sister taxa.
dc.description.publication-statusPublished
dc.identifierhttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000629986400001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=c5bb3b2499afac691c2e3c1a83ef6fef
dc.identifierARTN 637214
dc.identifier.citationFRONTIERS IN PLANT SCIENCE, 2021, 12
dc.identifier.doi10.3389/fpls.2021.637214
dc.identifier.elements-id441713
dc.identifier.harvestedMassey_Dark
dc.identifier.issn1664-462X
dc.publisherFrontiers Media
dc.relation.isPartOfFRONTIERS IN PLANT SCIENCE
dc.rightsThe Author(s) CC BY 4.0
dc.subjectcolonization
dc.subjectdiversification
dc.subjectendemism
dc.subjectisland floras
dc.subjectploidy level
dc.subjectphylogenetic path analysis
dc.subjectpolyploidy
dc.subjectwhole genome duplication
dc.subject.anzsrc0607 Plant Biology
dc.titlePolyploidy on Islands: Its Emergence and Importance for Diversification
dc.typeJournal article
pubs.notesNot known
pubs.organisational-group/Massey University
pubs.organisational-group/Massey University/College of Sciences
pubs.organisational-group/Massey University/College of Sciences/School of Natural Sciences
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