title: Climate-mediated movement of an avian hybrid zone.
abstract: The interaction between sibling species that share a zone of contact is a multifaceted relationship affected by climate change [1, 2]. Between sibling species, interactions may occur at whole-organism (direct or indirect competition) or genomic (hybridization and introgression) levels [3-5]. Tracking hybrid zone movements can provide insights about influences of environmental change on species interactions [1]. Here, we explore the extent and mechanism of movement of the contact zone between black-capped chickadees (Poecile atricapillus) and Carolina chickadees (Poecile carolinensis) at whole-organism and genomic levels. We find strong evidence that winter temperatures limit the northern extent of P. carolinensis by demonstrating a current-day association between the range limit of this species and minimum winter temperatures. We further show that this temperature limitation has been consistent over time because we are able to accurately hindcast the previous northern range limit under earlier climate conditions. Using genomic data, we confirm northward movement of this contact zone over the past decade and highlight temporally consistent differential-but limited-geographic introgression of alleles. Our results provide an informative example of the influence of climate change on a contact zone between sibling species.
authors.affiliation: Fuller Evolutionary Biology Program, Cornell Lab of Ornithology, 159 Sapsucker Woods Road, Ithaca, NY 14850, USA; Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14850, USA. Electronic address: sat235@cornell.edu.
authors.forename: Scott A
authors.initials: SA
authors.lastname: Taylor
authors.affiliation: Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14850, USA; Computational and Molecular Population Genetics, Institute of Ecology and Evolution, University of Bern, Baltzerstrasse 6, 3012 Bern, Switzerland.
authors.forename: Thomas A
authors.initials: TA
authors.lastname: White
authors.affiliation: Cornell Lab of Ornithology, 159 Sapsucker Woods Road, Ithaca, NY 14850, USA.
authors.forename: Wesley M
authors.initials: WM
authors.lastname: Hochachka
authors.affiliation: Fuller Evolutionary Biology Program, Cornell Lab of Ornithology, 159 Sapsucker Woods Road, Ithaca, NY 14850, USA; Department of Biology, Villanova University, 800 Lancaster Avenue, Villanova, PA 19085-1699, USA.
authors.forename: Valentina
authors.initials: V
authors.lastname: Ferretti
authors.affiliation: Department of Biology, Villanova University, 800 Lancaster Avenue, Villanova, PA 19085-1699, USA.
authors.forename: Robert L
authors.initials: RL
authors.lastname: Curry
authors.affiliation: Fuller Evolutionary Biology Program, Cornell Lab of Ornithology, 159 Sapsucker Woods Road, Ithaca, NY 14850, USA; Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14850, USA.
authors.forename: Irby
authors.initials: I
authors.lastname: Lovette
mesh_terms: D000483:Alleles; D000818:Animals; D057231:Climate Change; D005260:Female; D006824:Hybridization, Genetic; D008297:Male; D009656:North America; D058974:Phylogeography; D060047:Reproductive Isolation; D012621:Seasons; D020308:Songbirds / Q000235:genetics / Q000502:physiology; D013696:Temperature