The impacts of climate change on the ecology of a migrant wetland warbler

摘要: Climate-change has the potential to affect migratory birds by altering prey availability across their annual cycle. Observational and experimental approaches were used understand causes consequences of these changes on breeding productivity, mass regulation survival a wetland bird; Eurasian reed warbler Acrocephalus scirpaceus. Climatic influences invertebrate populations assessed monitoring natural experimentally-induced variations in temperature. Further increases early spring temperatures are likely result earlier resources. The responses tested with food supplementations, which advanced egg-laying dates, reduced laying interval incubation duration, increased nestling growth rate. These effects enable first fledglings increase opportunity for second attempts within peak window. wintering body condition comparing resources energy reserves contrasting habitats West Africa during non-breeding period. Birds occupying prey-rich maintained lower than conspecifics prey-poor dry-scrub habitats, consistent strategic buffering against starvation food-poor habitat. results suggest how warblers able survive quality potentially avoid density-dependent mortality associated drought as observed other migrants. Analysis long term (>30 year) weather revealed measurable but minor impacts, suggesting very adaptive environmental change. Overall, this study provides strong support climate-driven advance identifies parameters most affected availability. This an integrated original understanding mechanisms may underlie current levels population what appears be one few long-distance European songbird species currently benefiting from climate-change.