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Trawling exerts big impacts on small beasts

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摘要

Throughout the world, there is concern about the impact of trawling on deep-sea bottom communities (1). For the most part, this concern has been directed toward deep-sea coral reefs and sponge beds (2, 3). Reef structures, formed by the scleractinian coral, Lophelia pertusa, for example, can be up to 8,000 y old and can provide habitat for more than 700 smaller species (2). In contrast, there has been the sense that trawling on open mud bottoms has little or no impact on the resident species or at least that, because the smaller species have higher turnover rates, the recovery from trawling will be rapid (4). In PNAS, however, Pusceddu et al. show that trawling on deep-sea muddy bottoms strongly alters the biochemical nature of the sediment and reduces the species diversity and abundance of meiofaunal organisms (animals ～40–500 μm in size), and, in particular, the nematodes (5).

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