Gene flow between nascent species: geographic, genotypic and phenotypic differentiation within and between Aquilegia formosa and A. pubescens

Simple item page
dc.contributor.authorNoutsos, C.
dc.contributor.authorBorevitz, J. O.
dc.contributor.authorHodges, S. A.
dc.date.accessioned2015-09-08T02:40:02Z
dc.date.available2015-09-08T02:40:02Z
dc.date.issued2014-11
dc.description.abstractSpeciation can be described as a reduction, and the eventual cessation, in the ability to interbreed. Thus, determining how gene flow differs within and between nascent species can illuminate the relative stage the taxa have attained in the speciation process. Aquilegia formosa and A. pubescens are fully intercompatible, yet occur in different habitats and have flowers specialized for pollination by hummingbirds and hawkmoths, respectively. Using 79 SNP loci, we genotyped nearly 1000 individuals from populations of both species in close proximity to each other and from putative hybrid zones. The species shared all but one SNP polymorphism, and on average, allele frequencies differed by only 0.14. However, the species were clearly differentiated using Structure, and admixed individuals were primarily identified at putative hybrid zones. PopGraph identified a highly integrated network among all populations, but populations of each species and hybrid zones occupied distinct regions in the network. Using either conditional graph distance (cGD) or Fst/(1-Fst), we found significant isolation by distance (IBD) among populations. Within species, IBD was strong, indicating high historic gene flow. IBD extended approximately 100 km in A. pubescens and 30 km in A. formosa. However, IBD between the species was very weak and extended only a few km beyond hybrid zones, suggesting little recent gene flow. The extensive sharing of SNP polymorphisms between these species suggests that they are very early in the speciation process while the low signal of IBD suggests that they have largely ceased gene exchange.en_AU
dc.description.sponsorshipThis researchwas funded through NSF grants DEB-9726272 to SAH and EF-0412727 to SAH and JOB.en_AU
dc.identifier.issn0962-1083en_AU
dc.identifier.urihttp://hdl.handle.net/1885/15253
dc.publisherWileyen_AU
dc.rights© 2014 John Wiley & Sons Ltden_AU
dc.sourceMolecular ecologyen_AU
dc.subjectsnpsen_AU
dc.subjectcolumbinesen_AU
dc.subjecthybridizationen_AU
dc.subjectisolation by distanceen_AU
dc.subjectpopulation structureen_AU
dc.subjectaquilegiaen_AU
dc.subjectgene frequencyen_AU
dc.subjectgenetic markersen_AU
dc.subjectgenetics, populationen_AU
dc.subjectgenotypeen_AU
dc.subjectphenotypeen_AU
dc.subjectpolymorphism, single nucleotideen_AU
dc.subjectgene flowen_AU
dc.subjectgenetic speciationen_AU
dc.subjecthybridization, geneticen_AU
dc.titleGene flow between nascent species: geographic, genotypic and phenotypic differentiation within and between Aquilegia formosa and A. pubescensen_AU
dc.typeJournal articleen_AU
local.bibliographicCitation.issue22en_AU
local.bibliographicCitation.lastpage5598en_AU
local.bibliographicCitation.startpage5589en_AU
local.contributor.affiliationBorevitz, J., O., Research School of Biology, The Australian National Universityen_AU
local.contributor.authoremailjustin.borevitz@anu.edu.auen_AU
local.contributor.authoruidu5083581en_AU
local.identifier.citationvolume23en_AU
local.identifier.doi10.1111/mec.12962en_AU
local.identifier.essn1365-294Xen_AU
local.identifier.uidSubmittedByu1005913en_AU
local.publisher.urlhttp://au.wiley.com/WileyCDA/en_AU
local.type.statusPublished Versionen_AU

Downloads

License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
884 B
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

ANU Research Publications

DSpace software copyright © 2002-2024 LYRASIS