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Individual variation and repeatability of maximum cold-induced energy assimilation in house mice

100%

Koteja P., Swallow J. G., Carter P. A., Garland T.

Acta Theriologica

2000

tom 45

nr 4

Maximum cold-induced rate of food consumption in cold-acclimated laboratory house mice Mus domesticus averaged 10.4 g/day in females (body mass before cold exposure = 25.2 g) and 10.7 g/day in males (body mass = 31.7 g); corresponding maximum rates of energy assimilation were 139 kJ/day in females and 144 kJ/day in males. The traits were highly repeatable: the intraclass correlation coefficient for three trials at -10°C was greater than 0.7 for absolute values and greater than 0.6 for values independent of the initial body mass (residuals from ANCOVA). The estimate of repeatability of the mass-independent traits depends on which estimate of body mass (initial or after cold exposure) is used as a covariate in the regression or ANCOVA model. We conclude that the values of maximum cold-induced food consumption and energy assimilation are reliable estimates of the performance of individuals under a specific set of environmental conditions (low ambient temperature, but not limited access to food) and hence may be subject to phenatypic natural or artificial selection.

Ograniczanie wyników

1 Acta Theriologica

1 Carter P. A.

1 Garland T.

1 Koteja P.

1 Swallow J. G.

1 2000

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Individual variation and repeatability of maximum cold-induced energy assimilation in house mice