Why Brazil's Rough-Toothed Dolphins May Lose Their Home

Climate shifts are reshaping the ocean, and Brazil’s coast faces big changes. The rough-toothed dolphin, a top ocean hunter, depends on specific waters to survive. But as temperatures rise and ocean chemistry shifts, these dolphins may struggle to find safe places to live. The same goes for their food: three fish species that rely on stable conditions face losing parts of their home too. Researchers used computer models to predict where these animals can thrive now and in the future. They found that rough-toothed dolphins could lose between 8. 7% and 13. 6% of their best habitats, especially along Brazil’s northern and northeastern shores. Their prey won’t escape unharmed either. Mullets might lose a small chunk of their space—3% to 7%—while the largehead hairtail could see a much bigger drop of 31% to 35%. These aren’t just numbers; they show real risks for marine life already struggling to keep up with a changing planet.One big problem? Protection. Currently, only 3. 7% of the rough-toothed dolphin’s best spots overlap with protected ocean zones. Most of that small coverage is in areas with weak safeguards. Even as the dolphins’ homes shrink, Brazil’s marine protected areas won’t cover the gaps. Experts warn this gap will likely stay the same in coming decades, leaving dolphins and their prey with fewer safe places to go.