Temperature-related geographical shifts among passerines: contrasting processes along poleward and equatorward range margins

Ecology and Evolution
Laura E Coristine, Jeremy T Kerr

Abstract

Climate change is causing widespread geographical range shifts, which likely reflects different processes at leading and trailing range margins. Progressive warming is thought to relax thermal barriers at poleward range margins, enabling colonization of novel areas, but imposes increasingly unsuitable thermal conditions at equatorward margins, leading to range losses from those areas. Few tests of this process during recent climate change have been possible, but understanding determinants of species' range limits will improve predictions of their geographical responses to climate change and variation in extinction risk. Here, we examine the relationship between poleward and equatorward range margin dynamics with respect to temperature-related geographical limits observed for 34 breeding passerine species in North America between 1984-1988 and 2002-2006. We find that species' equatorward range margins were closer to their upper realized thermal niche limits and proximity to those limits predicts equatorward population extinction risk through time. Conversely, the difference between breeding bird species' poleward range margin temperatures and the coolest temperatures they tolerate elsewhere in their ranges was substantial and re...Continue Reading

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Citations

Feb 11, 2020·Global Change Biology·Alexa Fredston-HermannBenjamin S Halpern
Dec 20, 2016·Conservation Biology : the Journal of the Society for Conservation Biology·Cassandra M Robillard, Jeremy T Kerr
May 27, 2020·Nature Ecology & Evolution·Jonathan LenoirGaël Grenouillet
Apr 7, 2017·Proceedings. Biological Sciences·Emma I GreigDavid N Bonter

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