Rapid climate-­mediated movement of a chickadee hybrid zone.

TAYLOR, SCOTT A.; HOCHACHKA, WESLEY; WHITE, THOMAS A.; FERRETTI, VALENTINA; CURRY, ROBERT L.

Newport

Congreso; Joint Meeting of Association of Field Ornithologists and Wilson Ornithological Socielty; 2014

Association of Field Ornithologists y Wilson Ornithological Society

The interaction between sibling species that share a zone ofcontact is a multifaceted relationship affected by climatechange. Between sibling species, interactions mayoccur at whole-organism (direct or indirect competition) orgenomic (hybridization and introgression) levels.Tracking hybrid zone movements can provide insights aboutinfluences of environmental change on species interactions[1]. Here, we explore the extent and mechanism of movementof the contact zone between black-capped chickadees(Poecile atricapillus) and Carolina chickadees (Poecile carolinensis)at whole-organism and genomic levels. We findstrong evidence that winter temperatures limit the northernextent of P. carolinensis by demonstrating a current-dayassociation between the range limit of this species andminimum winter temperatures. We further show that thistemperature limitation has been consistent over timebecause we are able to accurately hindcast the previousnorthern range limit under earlier climate conditions. Usinggenomic data, we confirm northward movement of this contactzone over the past decade and highlight temporallyconsistent differential?but limited?geographic introgressionof alleles. Our results provide an informative exampleof the influence of climate change on a contact zone betweensibling species.