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Fig. 1. Development of wheel-running activity (revs day–1 and km
day–1), energy intake (kJ day–1) and whole
body mass (g) of females mice facing low foraging costs (L; filled circles),
high foraging costs (H; open circles) and restricted feeding without foraging
effort (R; gray shading). Error bars show the standard error of the mean.
Temperature transmitters were surgically implanted (S) on day
–34±1. L and H females were placed in cages with running wheels
on day –27 and exposed to the foraging task on day 0. Food rationing of
R females also began on day 0. Foraging costs of H mice increased by 10% of
baseline every other day until day 20 and were then held constant (at 200%
baseline). Animals were injected with the novel antigen KLH on day 39±1
and sacrificed on day 49±1. Energy intake is based on grams of food
ingested and manufacturer's estimate of energy content of food (line 3 of
Table 1). Sample sizes per
group were L=8, H=6 and R=7.
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