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Cooling requirements fueled the collapse of a desert bird community from climate change.
Proc Natl Acad Sci U S A 2019; 116(43):21609-21615PN

Abstract

Climate change threatens global biodiversity by increasing extinction risk, yet few studies have uncovered a physiological basis of climate-driven species declines. Maintaining a stable body temperature is a fundamental requirement for homeothermic animals, and water is a vital resource that facilitates thermoregulation through evaporative cooling, especially in hot environments. Here, we explore the potential for thermoregulatory costs to underlie the community collapse of birds in the Mojave Desert over the past century in response to climate change. The probability of persistence was lowest for species occupying the warmest and driest sites, which imposed the greatest cooling costs. We developed a general model of heat flux to evaluate whether water requirements for evaporative cooling contributed to species' declines by simulating thermoregulatory costs in the Mojave Desert for 50 bird species representing the range of observed declines. Bird species' declines were positively associated with climate-driven increases in water requirements for evaporative cooling and exacerbated by large body size, especially for species with animal-based diets. Species exhibiting reductions in body size across their range saved up to 14% in cooling costs and experienced less decline than species without size reductions, suggesting total cooling costs as a mechanism underlying Bergmann's rule. Reductions in body size, however, are unlikely to offset the 50 to 78% increase in cooling costs threatening desert birds from future climate change. As climate change spreads warm, dry conditions across the planet, water requirements are increasingly likely to drive population declines, providing a physiological basis for climate-driven extinctions.

Authors+Show Affiliations

Museum of Vertebrate Zoology, University of California, Berkeley, CA 94720; riddell@berkeley.edu.Museum of Vertebrate Zoology, University of California, Berkeley, CA 94720. Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA 94720-3110.Biology Department, University of New Mexico, Albuquerque, NM 87106.Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95060.Museum of Vertebrate Zoology, University of California, Berkeley, CA 94720. Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA 94720-3110.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31570585

Citation

Riddell, Eric A., et al. "Cooling Requirements Fueled the Collapse of a Desert Bird Community From Climate Change." Proceedings of the National Academy of Sciences of the United States of America, vol. 116, no. 43, 2019, pp. 21609-21615.
Riddell EA, Iknayan KJ, Wolf BO, et al. Cooling requirements fueled the collapse of a desert bird community from climate change. Proc Natl Acad Sci USA. 2019;116(43):21609-21615.
Riddell, E. A., Iknayan, K. J., Wolf, B. O., Sinervo, B., & Beissinger, S. R. (2019). Cooling requirements fueled the collapse of a desert bird community from climate change. Proceedings of the National Academy of Sciences of the United States of America, 116(43), pp. 21609-21615. doi:10.1073/pnas.1908791116.
Riddell EA, et al. Cooling Requirements Fueled the Collapse of a Desert Bird Community From Climate Change. Proc Natl Acad Sci USA. 2019 Oct 22;116(43):21609-21615. PubMed PMID: 31570585.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cooling requirements fueled the collapse of a desert bird community from climate change. AU - Riddell,Eric A, AU - Iknayan,Kelly J, AU - Wolf,Blair O, AU - Sinervo,Barry, AU - Beissinger,Steven R, Y1 - 2019/09/30/ PY - 2019/10/2/pubmed PY - 2019/10/2/medline PY - 2019/10/2/entrez KW - Bergmann’s rule KW - climate change KW - desert birds KW - evaporative cooling KW - thermoregulation SP - 21609 EP - 21615 JF - Proceedings of the National Academy of Sciences of the United States of America JO - Proc. Natl. Acad. Sci. U.S.A. VL - 116 IS - 43 N2 - Climate change threatens global biodiversity by increasing extinction risk, yet few studies have uncovered a physiological basis of climate-driven species declines. Maintaining a stable body temperature is a fundamental requirement for homeothermic animals, and water is a vital resource that facilitates thermoregulation through evaporative cooling, especially in hot environments. Here, we explore the potential for thermoregulatory costs to underlie the community collapse of birds in the Mojave Desert over the past century in response to climate change. The probability of persistence was lowest for species occupying the warmest and driest sites, which imposed the greatest cooling costs. We developed a general model of heat flux to evaluate whether water requirements for evaporative cooling contributed to species' declines by simulating thermoregulatory costs in the Mojave Desert for 50 bird species representing the range of observed declines. Bird species' declines were positively associated with climate-driven increases in water requirements for evaporative cooling and exacerbated by large body size, especially for species with animal-based diets. Species exhibiting reductions in body size across their range saved up to 14% in cooling costs and experienced less decline than species without size reductions, suggesting total cooling costs as a mechanism underlying Bergmann's rule. Reductions in body size, however, are unlikely to offset the 50 to 78% increase in cooling costs threatening desert birds from future climate change. As climate change spreads warm, dry conditions across the planet, water requirements are increasingly likely to drive population declines, providing a physiological basis for climate-driven extinctions. SN - 1091-6490 UR - https://www.unboundmedicine.com/medline/citation/31570585/Cooling_requirements_fueled_the_collapse_of_a_desert_bird_community_from_climate_change L2 - http://www.pnas.org/cgi/pmidlookup?view=long&pmid=31570585 DB - PRIME DP - Unbound Medicine ER -