New Research Predicts Effects of Marine Heatwaves on Top Ocean Predators

Real-time shifts in marine ecosystems and species demand “climate-ready” fisheries. This new research will inform fisheries management.

” by developing management strategies that can adjust to changes in ecosystems and their inhabitants.Climate-ready fisheries management decisions could include, for example, open fishing seasons, quotas, and boundaries that adjust to changing distributions of species. These decisions are especially important for species such as tuna, which fleets want to catch, as well as others such as endangered sea turtles they want to avoid.

Scientists examined the effects of four major marine heatwaves in the northeastern Pacific Ocean on 14 different predators including sea lions, bluefin tuna, mako sharks, and albatrosses. The effects on distributions varied across heatwaves and species. In some cases the habitat of species came close to disappearing while in other cases it nearly doubled in area.The researchers looked at how to develop an early-warning system that could alert managers to such changes before or as they happen.

“That gives an idea of the scale of the changes that management may have to adjust to in relatively short periods,” Welch said.

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