Great white sharks are struggling to survive as warming oceans push these apex predators toward their physiological limits. Edward Snelling, a physiologist at the University of Pretoria, warns that these mesotherms are already operating on tight energy budgets, and climate change is narrowing their options even further.

Using tiny sensors on fish including three-ton basking sharks, researchers discovered that warm-bodied sharks weighing one ton may struggle to survive in waters above 62.6° Fahrenheit without taking countermeasures. This research on "hidden heat budgets" could prove critical for conservation efforts and mapping protection areas.

In South Africa, the stakes are both ecological and cultural. Great whites have become sentinel species, with their changing patterns signaling deeper shifts in marine ecosystems. While long sensationalized as feared predators, they've increasingly become icons of marine conservation and eco-tourism, positioned as keystone species essential to maintaining ocean health. However, their population decline involves multiple factors including overfishing, shark netting, and habitat destruction, with bycatch representing the most urgent threat to their survival.