Associations between energetics and over-winter survival in the short-tailed field vole Microtus agrestis
作者： D. M. Jackson , P. Trayhurn , J. R. Speakman
DOI: 10.1046/J.1365-2656.2001.00518.X
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摘要: Summary 1 Over-winter mortality in small mammals is influenced strongly by low ambient temperatures. Individuals with greater thermogenic capacities might then be expected to survive better than those lower capacities. 2 To test this hypothesis, short-tailed field voles Microtus agrestis (Linnaeus) were captured during the winters of 1995/96 and 1996/97 at two sites near Aberdeen (57°N). The animals tagged taken back laboratory, where their resting metabolism (RMR), capacity (NA induced excluding RMR) body mass measured. 3 Body mass, RMR did not differ significantly between start end winter that both times. 4 Body varied over months, being lowest January highest March. Thermogenic also variation was linked changes temperature, suggesting either more likely active on cold nights, or flexible capacities. vary winter. 5 Animals survived had a higher residual died (or permanently emigrated) but survivors have masses, RMRs,
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