Coping With Extreme: Highland Eurasian Tree Sparrows With Molt-Breeding Overlap Express Higher Levels of Corticoserone-Binding Globulin Than Lowland Sparrows
Article first published online: 11 JUL 2013
© 2013 Wiley Periodicals, Inc.
Journal of Experimental Zoology Part A: Ecological Genetics and Physiology
Volume 319, Issue 8, pages 482–486, October 2013
How to Cite
2013. Coping with extreme: Highland Eurasian tree sparrows with molt-breeding overlap express higher levels of corticoserone-binding globulin than lowland sparrows. J. Exp. Zool. 319A:482–486., , , , , , .
- Issue published online: 11 SEP 2013
- Article first published online: 11 JUL 2013
- Manuscript Accepted: 3 JUN 2013
- Manuscript Revised: 15 APR 2013
- Manuscript Received: 21 JAN 2013
- National Natural Science Foundation of China, NSFC. Grant Numbers: 31000191, 30870265
- Postdoctoral Science Foundation of China. Grant Number: 2011M500537
- Natural Science Foundation of Hebei Province. Grant Number: C2012205018
In birds, suppressed expression of stress-induced corticosterone (CORT) during pre-basic molt is generally thought to reflect a physiological trade-off in self-maintenance. And reduced CORT during breeding in extreme environments may maximize reproductive success and optimize their fitness. Highland Eurasian tree sparrows (Passer montanus) are known to express significantly higher stress-induced CORT levels during the pre-basic molt stage. Here, we show that these highland sparrows are characterized by a life history strategy of molt-breeding overlap, with higher corticosterone-binding globulin (CBG) levels favoring molt and breeding consistent with fitness optimization on the Tibetan Plateau. These unique behavioral and physiological strategies reflect natural selection under strong evolutionary pressures in extreme high-altitude environments. J. Exp. Zool. 319A: 482–486, 2013. © 2013 Wiley Periodicals, Inc.