Science | VOL. 291
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Energetic and Fitness Costs of Mismatching Resource Supply and Demand in Seasonally Breeding Birds

Publication Date Mar 30, 2001

Abstract

By advancing spring leaf flush and ensuing food availability, climatic warming results in a mismatch between the timing of peak food supply and nestling demand, shifting the optimal time for reproduction in birds. Two populations of blue tits ( Parus caeruleus ) that breed at different dates in similar, but spatially distinct, habitat types in Corsica and southern France provide a unique opportunity to quantify the energetic and fitness consequences when breeding is mismatched with local productivity. As food supply and demand become progressively mismatched, the increased cost of rearing young pushes the metabolic effort of adults beyond their apparent sustainable limit, drastically reducing the persistence of adults in the breeding population. We provide evidence that the economics of parental foraging and limits to sustainable metabolic effort are key selective forces underlying synchronized seasonal breeding and long-term shifts in breeding date in response to climatic change.

Concepts

Populations Of Blue Tits Reproduction In Birds Blue Tits Long-term Shifts Blue Tits Parus Caeruleus Fitness Consequences Blue Tits Parus Habitat Types Local Productivity Seasonal Breeding

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