Behavioural and trophic niche partitioning between two sympatric marsh terns

This dataset accompanies a study examining trophic and spatial niche differentiationbetween two sympatrically breeding marsh terns, the White-winged Tern (Chlidonias leucopterus)and the Black Tern (Chlidonias niger), in a near-natural floodplain river valley in eastern Poland.The study integrates quantitative data on chick diet composition with behavioural observationsof adult foraging habitat use during the breeding period.