Ageing gracefully: physiology but not behaviour declines with age in a diving seabird

被引:46
作者
Elliott, Kyle H. [1 ]
Hare, James F. [1 ]
Le Vaillant, Maryline [2 ,3 ]
Gaston, Anthony J. [4 ]
Ropert-Coudert, Yan [2 ,3 ]
Anderson, W. Gary [1 ]
机构
[1] Univ Manitoba, Dept Biol Sci, Winnipeg, MB R3T 2N2, Canada
[2] Univ Strasbourg, IPHC, F-67087 Strasbourg, France
[3] CNRS, UMR7178, F-67037 Strasbourg, France
[4] Carleton Univ, Environm Canada, Natl Wildlife Res Ctr, Ottawa, ON K1A 0H3, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
basal metabolic rate; behavioural senescence; cost of hypoxia; diving; physiological senescence; rate of living theory; resting metabolic rate; thick-billed murre; GUILLEMOTS URIA-LOMVIA; BASAL METABOLIC-RATE; THICK-BILLED MURRES; LONG-LIVED SEABIRD; AEROBIC DIVE LIMIT; ENERGY-EXPENDITURE; REPRODUCTIVE-PERFORMANCE; FORAGING BEHAVIOR; BODY-COMPOSITION; LIPID-PEROXIDATION;
D O I
10.1111/1365-2435.12316
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071301 [植物生态学];
摘要
A higher proportion of long-lived animals die from senescence than short-lived animals, yet many long-lived homeotherms show few signs of physiological ageing in the wild. This may, however, differ in long-lived diving homeotherms that frequently encounter hypoxic conditions and have very high metabolic rates. To examine ageing within a long-lived diving homeotherm, we studied resting metabolism and thyroid hormones (N=43), blood oxygen stores (N=93) and foraging behaviour (N=230) of thick-billed murres (Uria lomvia). Because murres dive exceptionally deep for their size and have a very high metabolism, we expected that ageing murres would show signs of physiological senescence. We paid particular attention to resting metabolism as we argue that these maintenance costs reflect those experienced during deep dives. Blood oxygen stores (haematocrit), resting metabolic rate and thyroid hormone levels all declined significantly with age in incubating murres 3-30years of age. In birds measured longitudinally 3years apart, thyroid hormone levels and haematocrit were both significantly lower, suggesting progressive changes within individuals rather than selective disappearance of individuals with high metabolic rates. Within our longitudinal data set, we found no effect of age on dive depth, dive shape or behavioural aerobic dive limit. A meta-analysis of changes in resting metabolism with age across 15 animal species demonstrated that such declines are pervasive across most of the kingdom. The rate of decline was highest in species with high energy expenditure supporting a linkage between metabolism and senescence. Physiological changes occurred in tandem with advancing age in murres, but offset each other such that there was no detectable decline in behavioural performance.
引用
收藏
页码:219 / 228
页数:10
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