Journal
EVOLUTION
Volume 70, Issue 10, Pages 2322-2335Publisher
OXFORD UNIV PRESS
DOI: 10.1111/evo.13027
Keywords
Ecological divergence; Helianthus petiolaris; incipient speciation; pollen competition; reciprocal transplant; sand dune adaptation
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Funding
- NSERC [327475, 183611]
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Measuring reproductive barriers between groups of organisms is an effective way to determine the traits and mechanisms that impede gene flow. However, to understand the ecological and evolutionary factors that drive speciation, it is important to distinguish between the barriers that arise early in the speciation process and those that arise after speciation is largely complete. In this article, we comprehensively test for reproductive isolation between recently diverged (<10,000 years bp) dune and nondune ecotypes of the prairie sunflower, Helianthus petiolaris. We find reproductive barriers acting at multiple stages of hybridization, including premating, postmating-prezygotic, and postzygotic barriers, despite the recent divergence. Barriers include extrinsic selection against immigrants and hybrids, a shift in pollinator assemblage, and postpollination assortative mating. Together, these data suggest that multiple barriers can be important for reducing gene flow in the earliest stages of speciation.
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