Body mass regulation and the daily singing routines of European robins

摘要: Stochastic dynamic programming (SDP) models of daily singing and foraging routines in birds relate an individual's fat reserves to the relative costs benefits at different times day. Two central predictions such are that: (1) overnight loss is higher on colder nights, (2) sing more dawn when their high. We tested these free-living European robins, Erithacus rubecula, by examining relationships between ambient temperature, body mass change (an index changes reserves) song rate. In support prediction (1), was positively associated with temperature. However, robins also put dusk if night ahead going be cold, which tended buffer effects temperature mass. (2), sang days high, although this association detectable only after controlling for intensity during chorus. analyse differences results related studies discuss implications existing SDP routines.