1.Instead of just times to cool (tcool) and heat (theat), intermittent incubation cycles contain a period (tequil) when eggs are kept at relatively high equilibrium temperatures after heating.2.Relative allocations favoring parental self-maintenance [when (tcool+theat)>tequil] versus embryo development [when (tcool+theat)<tequil] were measured for house wrens (Troglodytes aedon), tree swallows (Tachycineta bicolor) and black-capped chickadees (Poecile atricapillus).3.Wrens showed over-all significant relative allocation to parental self-maintenance, while chickadees and swallows balanced both functions.4.House wrens gradually shifted allocation toward increased average egg temperature as incubation progressed, calling into question how temperature influences development rate.
- Average egg temperature
- Parental self-maintenance
- Time allocations
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)