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首页> 外文期刊>Estuarine Coastal and Shelf Science >Shifting south-eastern North Sea macrofauna community structure since 1986: A response to de-eutrophication and regionally decreasing food supply?
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Shifting south-eastern North Sea macrofauna community structure since 1986: A response to de-eutrophication and regionally decreasing food supply?

机译：自1986年以来东南北海大型动物群落结构的转移：对富营养化和区域粮食供应减少的反应？

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摘要

Since the second half of the 20th century drastic changes were found within the marine environment, mostly driven by anthropogenic and climatic pressures. Within this study, the long-term variability of south-eastern North Sea macrofauna community structure was analysed on a large spatial extent, to examine effects of increasing sea surface temperature, decreasing pelagic and benthic primary production and phytoplankton biomass, together with de-eutrophication effects since the late 1980s. Macrofauna data from the 1986 North Sea Benthos Survey and the 2000 North Sea Benthos Project were reanalysed and compared with present data from 2010 to 2015. A stable spatial distribution of four main macrofauna communities was found, based on the environmental parameters depth, sediment composition, and tidal parameters. Diversity and taxa numbers remained stable since 1986. However, in 2010-2015, mean abundance and biomass of offshore waters had decreased slightly, while at the coastal nearshore areas and parts of the Oysterground a significant increase was found. Simultaneously, a spatial shift in maximum mean abundance and biomass from the Dogger Bank and Oysterground in 1986 towards the North Frisian coast in 2000 and 2010-2015 was found. Changes were probably driven by de-eutrophication effects in line with food limitation caused by decreasing phytoplankton biomass and pelagic and benthic primary production that strengthen the dominance of opportunistic tube-living taxa such as Phoronis spp. and Spiophanes bombyx. Synergistic effects of increasing sea surface temperature, ongoing seabed degradation, and predation by small non-target fish species caused distinct regionally different changes in characteristic species and dominance structure.
机译：自20世纪下半叶以来，在海洋环境中发现了巨大变化，主要是由人为和气候压力驱动的。在这项研究中，在较大的空间范围内分析了东南北海大型动物群落结构的长期变异性，以研究海面温度升高，浮游和底栖初级生产力和浮游植物生物量减少以及富营养化的影响。自1980年代后期以来的影响。重新分析了1986年北海底栖动物调查和2000年北海底栖动物项目的大型动物数据，并将其与2010年至2015年的现有数据进行了比较。根据环境参数的深度，沉积物成分，发现了四个主要大型动物群落的稳定空间分布。和潮汐参数。自1986年以来，多样性和分类单元数量一直保持稳定。但是，在2010-2015年，近岸水域的平均丰度和生物量略有下降，而在沿海近岸地区和牡蛎地的部分地区却发现了显着增长。同时，从1986年的Dogger Bank和Oysterground向2000年和2010-2015年的北弗里斯兰海岸发现了最大平均丰度和生物量的空间变化。富营养化的影响可能是由于富营养化效应所致，而这种变化是由于浮游植物生物量减少以及浮游和底栖初级生产（加强食管物种）的机会性管类生物的优势而引起的食物限制所致。和Spiophanes蚕。海平面温度升高，海床不断退化以及小型非目标鱼类捕食的协同效应导致特征物种和优势结构发生明显的区域差异。

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