Performance tradeoffs and resource availability drive variation in reproductive isolation between sympatrically diverging crossbills

Cody Porter & Craig Benkman
Theoretical models indicate that speciation, especially when the scope for gene flow is great (e.g., sympatric speciation), is most likely when strong performance tradeoffs coincide with reproduction. We tested this classic hypothesis using measures of the strength of three prezygotic reproductive isolating barriers (habitat isolation, reduced immigrant fecundity, and behavioral isolation) between two young (~2,000 yrs) and sympatric red crossbill (Loxia curvirostra) ecotypes. All three isolating barriers increased with increases in performance tradeoffs, with total...
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