S01.3: Differential use of nutrient stores in migrating and breeding land birds

Department of Biological Sciences, Box 5018, University Southern Mississippi, Hattiesburg, MS 39406-5018 USA, e-mail fmoore@whale.st.usm.edu

Whereas the annual cycle of birds is typically adapted to segregate the major demanding functions of moult, migration, and reproduction, events occurring in one phase of the annual cycle often influence survival or reproductive success in a subsequent phase. For example, migratory birds deposit substantial fat stores to offset the energetic demands of migration. Fat stores acquired during migration may improve parental condition and influence reproductive success among migrant land birds. I review evidence that endogenous nutrient stores, accumulated during migration, may function to buffer the effects of shortages of food or specific nutrients at the breeding destination or to offset time constraints associated with a brief breeding season. Although attention is focused on fat and protein stores, arguments regarding nutrient dynamics between phases of the annual cycle extend to other nutrients, including vitamins and minerals. I also consider evidence that migrant land birds suffer consequences during the breeding season due to events experienced prior to arrival on the breeding grounds.

Note: Full paper not submitted