Abstract
Abstract To investigate seasonal tactics of energy management, core body temperature (Tb) was monitored over 1 year in eastern gray squirrels (Sciurus carolinensis) maintained on a constant diet in an outdoor enclosure. Each fortnight, we recorded hourly temperatures via radio-telemetry on 2 separate days. We also measured Tb during 10-day periods of food deprivation in winter and summer. In comparison with summer and autumn values, Tb was 1–4°C lower at all times of the daily cycle throughout winter and spring. Night and morning Tb was reduced during food deprivation, and reductions during the winter deprivation (1–3°C) generally exceeded reductions during the summer deprivation (0–2°C). Maximum sustained Tb and activity levels occurred during late afternoon or early evening hours year-round, however, and Tb at this time of day during deprivations was indistinguishable from Tb under ad-lib feeding conditions in the same season. Seasonal change in Tb, including reduction in response to food deprivation, c...
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