The effect of migration strategy and food availability on White Stork Ciconia ciconia breeding success

摘要: In the mid 1970s, breeding populations of migrant White Stork Ciconia ciconia were close to extinction in northeastern region France (Alsace). A re-introduction project was implemented, resulting year-round settlement some individuals region, which rely on additional food supplied by humans during winter. Today, both resident and birds breed same areas take from rubbish dumps (farmers). The effects these anthropogenic influences, altering behaviour, reproductive success are not known. aim this study test influence bird status (resident vs. migrant) availability (control nests that benefit high supply) success. control nests, mean laying date earlier than Storks. There also a clear seasonal decline clutch size. For all numbers eggs hatchlings higher migrants, can be attributed large broods showed mortality rate, leading fledgling (fledglings/hatchlings) number fledglings as migrants. Fledgling for reliable supply. summary, although produce more we found no advantage terms fledglings. rate chicks pairs with brood could caused deterioration their habitat. Thus, Storks may present biological if quality habitat is guaranteed conservation grasslands.