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首页> 外文期刊>Canadian Journal of Fisheries and Aquatic Sciences >The effects of trawling and primary production on size-structured food webs in seabed ecosystems
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The effects of trawling and primary production on size-structured food webs in seabed ecosystems

机译：牵引和初级生产对海底生态系统规模结构食品网的影响

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摘要

Understanding how different drivers shape relationships between abundance and body mass (size spectra) is important for understanding trophic and competitive interactions in food webs and for predicting the effects of human pressures. Here, we sample seabed communities from small polychaetes (<0.001 g) to large fish (> 1 kg) in the Celtic Sea and the western English Channel to examine how bottom trawling and primary production affect their size spectra and to compare these with predictions from a model that couples predator and detritivore communities. Size spectra were not well approximated by linear fits because of truncation of the size spectra of detritivores. Low primary production resulted in lower abundance of benthic fauna. Bottom trawling reduced the abundance of predators and large detritivores but allowed small detritivores to increase in abundance. These empirical size spectra were partly consistent with predictions from the size spectra model, showing that understanding the structuring of benthic communities requires a consideration of both size and functional group. The findings highlight the need for an ecosystem approach to understanding the effects of exploitation and climate change on marine ecosystems.
机译：了解丰度和体重（尺寸谱）之间的不同驱动器形状的关系是如何理解食品网中的营养和竞争相互作用以及预测人类压力的影响。在这里，我们将海底社区从小型聚氯乙烯（<0.001g）中的大型鱼（> 1千克）和西方英语频道查询，以检查底部拖网和主要生产如何影响其大小的光谱，并与预测相比之下夫妻捕食者和Detrivore社区的模型。由于DEDRITIVORES的尺寸光谱截短，尺寸光谱不受线性拟合的很好地近似。低初级生产导致了较低丰富的底栖动物。底部拖网减少了丰富的捕食者和大型DetRitivores，但允许小型脱脂以增加丰富。这些经验尺寸的光谱与来自尺寸光谱模型的预测部分一致，表明了解底栖社区的结构需要考虑尺寸和功能组。调查结果强调了生态系统方法，了解剥削和气候变化对海洋生态系统的影响。

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