Than 15% of the 1.2 million described species on Earth ogists (Friedman 2009), but many have argued that Land & Wortley 2003), which together account for more radiation have long been a puzzle for evolutionary biol. The mechanisms underlying their explosive There are at least 200 000 species of angiosperms (Scot- 2010). Nated in the mid-Jurassic to early Cretaceous (Bell et al. The angiosperms are geologically young, having origi. Received revision received 27 September 2012 accepted 2 October 2012 Keywords: angiosperms, coevolution, hybridization, population genetics-empirical, speciation, Required to maintain phenotypic differences in the face of ongoing gene flow. The data suggest that pollinator behaviour determines the magnitude andĭirection of gene flow between the two subspecies, but that specialized pollinationĪlone is not sufficient to maintain species boundaries. The subspecies and that the direction of gene flow matches differences in pollinator Coalescent-based estimates of migration indicated significant gene flow between Microsatellite genotyping revealed a high frequency of genetically admixed, hybrid jaegeriana vegetative morphology-never occurred. jaegeri-Īna, but vegetative features typical of Y. These included trees with floral characters typical of Y. Sive sampling in a zone of sympatry, a large number of morphologically intermediate Ous work indicated that the pollinators differ in host specificity, and DNA sequenceĭata suggested asymmetric introgression between the tree subspecies. Ization and gene flow between two subspecies of Joshua tree (Yucca brevifolia brevifoliaĪnd Yucca brevifolia jaegeriana) pollinated by two sister species of yucca moth. Mediate reproductive isolation in these systems. However, few studies have evaluated the degree to which pollinators actually Where both a plant and its pollinator are dependent upon one another for reproductionĪre thought to be prone to rapid diversification through co-evolution and pollinator Their spectacularĭiversity is often attributed to specialized pollination. The angiosperms are by far the largest group of terrestrial plants. University of Idaho, Moscow, ID 83844, USA *Department of Biology, Willamette University, 900 State Street, Salem, OR 97301 USA, †Department of Biological Sciences, Y O D E R, † ‡ R A M O N A F L A T Z * and Trees (Agavaceae: Yucca) reflect differences in pollinator Molecular Ecology (2012) doi: 10.1111/mec.12124Īsymmetric hybridization and gene flow between Joshua
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