Impacts of frequent, acute pulses of corticosterone on condition and behavior of Gambel's white-crowned sparrow (Zonotrichia leucophrys gambelii)

General and Comparative Endocrinology
D Shallin BuschEllen H Boyd

Abstract

Little is known about how frequent, acute stressors affect wild animals. We present two experiments conducted on captive, Gambel's white-crowned sparrow (Zonotrichia leucophrys gambelii) that explore how frequent, acute doses of corticosterone (CORT) affect condition and behavior. CORT was administered either once or three times a day to birds in pre-breeding, early-breeding, or late-breeding life-history stages. Two additional groups were included to control for the CORT delivery vehicle, DMSO, and the treatment process. Our results indicate that CORT treatment decreases condition, but that its effects are dependent on frequency and life stage. Specifically, CORT-treated birds delayed the onset of molt and had reduced body mass, flight muscle, and food consumption. CORT treatment did not affect fat stores, bile retention in the gallbladder, or the expression of migratory restlessness behavior. These results increase our understanding of the effects of frequent, acute stressors and the development of chronic stress states.

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Citations

May 24, 2014·General and Comparative Endocrinology·Gail L McCormick, Tracy Langkilde
Jan 11, 2013·Physiological and Biochemical Zoology : PBZ·Scott DaviesPierre Deviche
Jul 27, 2015·General and Comparative Endocrinology·Gail L McCormickTracy Langkilde
Jul 5, 2015·General and Comparative Endocrinology·Michelle A Rensel, Barney A Schlinger
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Jan 1, 2015·Conservation Physiology·Natalie M SopinkaSteven J Cooke
Dec 25, 2019·General and Comparative Endocrinology·George A BruschOlivier Lourdais
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