Climate Change Is Changing Fish Behavior. It Could Lead to Extinction

A study shows that warming waters cause fish to alter their prey selection towards smaller, more abundant species, potentially increasing extinction risks due to unmet metabolic needs, highlighting marine ecosystems’ vulnerability to climate change., fish are adapting their hunting and feeding patterns in response to warmer ocean temperatures, a shift that models indicate could increase the likelihood of extinctions.

Model food web calculations show that this mismatch between a fish’s energetic requirements and their actual food intake could lead to more extinctions under warmer conditions, with fish ultimately starving because they are not eating enough to meet their energetic needs. The model, which can also be applied to other consumer species, suggests this is especially true for species higher up in food chains.

“Fish species in the Baltic Sea and elsewhere are facing a multitude of man-made pressures, like overfishing or pollution,” adds co-author Gregor Kalinkat of the Leibniz Institute of Freshwater Ecology and Inland Fisheries . “The effect of more inefficient prey searching behavior under warming might be another, so far overlooked factor leading to fish stocks that cannot recover even when fisheries pressure is significantly reduced.

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