The southern rockhopper penguin (Eudyptes chrysocome) has declined by over 30% in the Falkland Islands since the 1980s. Competition with commercial fisheries for squid and fish, combined with climate-driven prey shifts, is driving breeding failure across major colonies.
Foraging adults that return to colonies after unsuccessful trips find chicks in distress from hunger. Extended foraging trips leave chicks vulnerable to cold, dehydration, and predation by striated caracaras. Adults caught as fishing bycatch drown in nets. The physiological stress of extended unsuccessful foraging is measurable through elevated corticosterone in returning adults. Chick mortality rates increase markedly in years when prey abundance is low, directly linked to adult foraging success. Conservation welfare requires simultaneous fisheries management reform and habitat protection.