Migratory shorebirds depend on a chain of critical stopover sites to refuel during journeys spanning thousands of kilometers, and degradation of even a single key site can affect the welfare and survival of entire flyway populations.
The welfare of migratory shorebirds is uniquely vulnerable to habitat loss because their extraordinary physiological investment in long-distance migration leaves no margin for failed fueling attempts. A shorebird that arrives at a stopover site depleted from flight, only to find insufficient food or disturbed foraging conditions, faces a physiological crisis that may prevent completion of migration or breeding. The suffering this entails is acute: exhausted, starving birds in declining body condition forced to extend already extreme endurance flights. The collapse of horseshoe crab populations at Delaware Bay, which provide the high-energy eggs that Red Knots need to complete their Arctic migration, illustrates how a single trophic link can determine the fate of an entire flyway population. Protecting stopover habitat is among the highest-impact welfare interventions available for these species.