Replicated population divergence caused by localized coevolution?: A test of three hypotheses in the red crossbill-lodgepole pine system
2006 (English)In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 19, no 5, 1651-1659 p.Article in journal (Refereed) Published
Several lines of evidence support the hypothesis that local populations of red crossbills (Loxia curvirostra complex) enter into a predator-prey arms race with lodgepole pine (Pinus contorta latifolia) in the absence of competing pine squirrels (Tamiasciurus hudsonicus). Nevertheless, the alternative hypotheses that neutral evolution or factors other than squirrels have caused crossbill population differentiation have not been thoroughly tested. We compared crossbill and pine cone morphology between island populations where squirrels are absent or present, and mainland sites where squirrels are present, in order to distinguish among these hypotheses. All comparisons supported an effect of squirrel absence, not island status, on crossbill and cone morphology. Hence our results provide further evidence that strong localized coevolutionary interactions in a geographic mosaic have driven adaptive population differentiation. In addition, vocal differentiation of crossbills was related to the absence of squirrels, but not to island status. As morphological and vocal differentiation is correlated with reproductive isolation in crossbills, the geographic mosaic of coevolution also seems to promote ecological speciation.
Place, publisher, year, edition, pages
2006. Vol. 19, no 5, 1651-1659 p.
arms race, divergent selection, ecological speciation, geographic mosaic of coevolution, Loxia curvirostra, Pinus contorta, population differentiation, replicated evolution
IdentifiersURN: urn:nbn:se:uu:diva-155678DOI: 10.1111/j.1420-9101.2006.01113.xISI: 000239692000037PubMedID: 16910994OAI: oai:DiVA.org:uu-155678DiVA: diva2:427604