Atlantic puffins face converging threats from climate-driven prey shifts, marine pollution, and predator pressure that are reducing breeding success across their North Atlantic range.
Puffin chick welfare during breeding seasons has deteriorated as sand eel availability shifts geographically in response to warming. Chicks inadequately provisioned by parents that cannot find prey close to colonies show reduced growth, immune function, and survival. Adult puffins traveling further to find food experience increased energy expenditure and fatigue. Chronic prey stress at the colony level reduces the welfare of individual birds across every life stage. Climate mitigation represents the most fundamental intervention for puffin welfare.