Present address: Department of Biology, Willamette University, 900 State Street, Salem, OR 97301, USA.
Absence of population-level phenotype matching in an obligate pollination mutualism
Article first published online: 7 OCT 2010
© 2010 The Authors. Journal Compilation © 2010 European Society For Evolutionary Biology
Journal of Evolutionary Biology
Volume 23, Issue 12, pages 2739–2746, December 2010
How to Cite
GODSOE, W., YODER, J. B., SMITH, C. I., DRUMMOND, C. S. and PELLMYR, O. (2010), Absence of population-level phenotype matching in an obligate pollination mutualism. Journal of Evolutionary Biology, 23: 2739–2746. doi: 10.1111/j.1420-9101.2010.02120.x
- Issue published online: 15 NOV 2010
- Article first published online: 7 OCT 2010
- Received 27 April 2010; revised 7 August 2010; accepted 31 August 2010
Coevolution is thought to promote evolutionary change between demes that ultimately results in speciation. If this is the case, then we should expect to see similar patterns of trait matching and phenotypic divergence between populations and between species in model systems for coevolution. As measures of divergence are frequently only available at one scale (population level or taxon level), this contention is rarely tested directly. Here, we use the case of co-divergence between different varieties of Joshua tree Yucca brevifolia (Agavaceae) and their obligate pollinators, two yucca moths (Tegeticula spp. Prodoxidae), to test for trait matching between taxa and among populations. Using model selection, we show that there is trait matching between mutualists at the taxon level, but once we account for differences between taxa, there is no indication of trait matching in local populations. This result differs from similar studies in other coevolving systems. We hypothesize that this discrepancy arises because coevolution in obligate mutualisms favours divergence less strongly than coevolution in other systems, such as host–parasite interactions.