Publicado por: pongpesca | 2020/03/06

Fishing trawlers could harm water quality by disrupting seafloor microbes

“Fishing boats that drag nets along the sea floor to catch seafood can indiscriminately harm marine life and destroy habitat. Now, a new study suggests “bottom trawling” can also disrupt the ability of microbes in sediment to remove excess nutrients in coastal waters, potentially increasing that pollution. “This is one of the first papers to look at actual biogeochemical effects of bottom trawling,” says Sebastiaan van de Velde, a marine biogeochemist at the University of California, Riverside, who was not involved. “The whole angle is very novel.” Nitrogen is a vital nutrient for aquatic plants such as kelp and tiny marine algae known as phytoplankton. But too much—as comes with poorly treated sewage or fertilizer washing off farm fields—stimulates so-called algal blooms. The excess algae can be a nuisance, tangling boat propellers and rotting on beaches. And when the algae die in the water, things get worse: Microbes that break it down gobble up oxygen and can create a dead zone that suffocates fish and other marine creatures.”

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Fonte: Science, 3 de Março de 2020.


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