Turtle doves are now critically endangered in the UK, having declined by over 97% due to agricultural intensification reducing seed food and nesting scrub.
Food shortages on farmland reduce adult and chick nutrition causing condition decline before southward migration. Migration through heavily hunted Mediterranean countries adds direct mortality. Drought in the Sahel wintering grounds causes starvation stress. Pairs that arrive at farmland with insufficient seed food attempt breeding with poor nutritional reserves reducing chick survival. The near-extinction trajectory means any additional stress is significant at the population level.