Fossil fish bones in marine sediments off Peru suggest that smaller fish species will dominate the oceans of a warmer Earth. The findings in Science reveal new insights into the ecological and economic impacts of our rapidly warming climate.
Our anthropogenically warmed climate will lead to a suite of organismal changes. To predict how some of these may occur, we can look to past warm periods. Salvatteci. used this approach and looked at a marine sediment record of the Humboldt Current system off the coast of Peru . They found that previous warm periods were dominated by small, goby-like fishes, whereas this ecosystem currently is dominated by anchovy-like fishes.
—SNVClimate change is expected to result in smaller fish size, but the influence of fishing has made it difficult to substantiate the theorized link between size and ocean warming and deoxygenation. We reconstructed the fish community and oceanographic conditions of the most recent global warm period by using sediments from the northern Humboldt Current system off the coast of Peru, a hotspot of small pelagic fish productivity.
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