Spatiotemporal variation in hatching success and nestling sex ratios track rapid movement of a songbird hybrid zone

Robert Driver, Valentina Ferretti, Emily S. Burton, Michael W. McCoy, Kerri C. Duerr & Robert L. Curry
Hybridization often occurs at the parapatric range interface between closely related species, but fitness outcomes vary: hybrid offspring exhibit diverse rates of viability and reproduction when compared to their parental species. The mobile hybrid zone between two chickadee congeners ( Poecile atricapillus x P. carolinensis ) has been well studied behaviorally and genetically but the viability of hybrids, as well as the underlying mechanisms contributing to hybrid fitness, have remained unclear. To better characterize the...
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