The Auk An International Journal of Ornithology Vol. 126 No. 1 January 2009 The Auk 126(1):1â23, 2009 ï The American Ornithologistsâ Union, 2009. Printed in USA. SPECIAL REVIEWS IN ORNITHOLOGY A Birdâs-eye View of Aging: whAtâs in it for ornithologists? D onna H olmes1,3 anD K atHy m artin 2 School of Biological Sciences and Center for Reproductive Biology, Washington State University, Pullman, Washington 99164, USA; and 2 Department of Forest Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada Organismal aging, or senescence, can be defined as a progres- models for aging studies, there is growing appreciation of the utilsive, irreversible loss of function that results in declines in fer- ity of comparative and evolutionary approaches to understanding tility and survival. This definition restricts âagingâ to age-related basic aging processes (Austad 2001, Holmes et al. 2003a, Buffendeterioration that occurs after organisms reach maturity, in- stein 2005, Hulbert et al. 2007, Holmes and Kristan 2008). cluding processes that can be detriImprovements in marking and mental to reproductive success and, monitoring techniques now furnish hence, relevant to fitness tradeoffs. a wealth of demographic data from âBird studies offer a rich The biology of aging, or âbiogeronwild bird
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