Wild dolphins face multiple anthropogenic threats including bycatch in fishing gear, noise pollution, chemical contamination, and food depletion that compromise both welfare and population viability.
Wild dolphin welfare is threatened by a cascade of anthropogenic pressures that individually and collectively cause suffering. Bycatch drowning causes acute suffocation death in snared individuals. Noise pollution causes hearing damage, behavioral disruption including separation of mothers and calves, and in extreme cases (military sonar) decompression-like injuries causing hemorrhage and death. Chemical pollutant accumulation causes immune suppression leading to disease vulnerability and slow, debilitating illness. Nutritional stress from depleted prey affects mothers particularly severely, reducing milk quality and calf survival. Each stranded dolphin that dies on a beach typically represents the accumulated welfare costs of these multiple stressors.