Narwhals face compounding threats from climate change, shipping noise, and entanglement that affect individual welfare and population viability in their rapidly changing Arctic habitat.
Narwhals are physiologically and behaviorally ill-equipped for the rapidly changing Arctic. Research has shown that when startled by human disturbance, narwhals experience paradoxical responses - their heart rate drops dramatically (diving response) while simultaneously flooding with stress hormones (flight response), creating intense cardiovascular strain. This dual stress response evolved for predator encounters but is now triggered repeatedly by boats, helicopters, and industrial noise. Climate change compounds this by eliminating sea ice refugia that narwhals rely on for protection and feeding. Individual welfare impacts from chronic stress are difficult to measure but likely substantial.