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首页> 外文会议>IEEE/OES US/EU-Baltic International Symposium >Factors affecting the role of macrobenthos in pelagic-benthic coupling in the Neva Bay (eastern Gulf of Finland)
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Factors affecting the role of macrobenthos in pelagic-benthic coupling in the Neva Bay (eastern Gulf of Finland)

机译：影响Macrobenthos在涅瓦湾（芬兰东部）中麦克饼底座耦合的作用的因素

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摘要

Long-term fluctuations in composition, biomass and functional patterns of benthic animal communities in Neva Bay, which became freshwater artificial lagoon in the middle 1980s due to construction of flood protection barrier (Dam), are depended on both natural and anthropogenic factors. The influence of natural climatic induced factors is evinced by periodic high increase in zoobenthic biomass with a dominance of small mollusks, Pisidiidae, in the eastern part of the bay near the delta of Neva River (the area with highest sedimentation rate of particulate organic matter) for the years of high run-of of Neva River. It is periodically succeeded by dominance of large mollusks, Unionidae, in the other parts of Neva Bay in the years of low run-of of Neva River. Progressive decrease in abundance of glacial relicts, Pallasea quadrispinosa, and increase of Oligochaeta worms was observed since the beginning of 20th Century probably due to an increase of eutrophication and organic pollution in the bay. Functional role of zoobenthic communities in decomposition of organic matter and regeneration of phosphorus in the bay was very high at the beginning of 1980's in the period of high river run-of. In that time their food consumption was much higher than primary production in Neva Bay and they decomposed the main portion of the particulate organic matter brought by the Neva River waters. The role of zoobenthos in decomposition of organic matter has decreased during the last two decades in a period of low run-of due to the shift of the dominance of small Pisidiidae to large Unionidae and increase of plankton primary production in the bay. Large scale digging and dumping of bottom sediments dealing with constructions of new lands and ports in the eastern part of Neva Bay, which began in 2006 and resulted in distribution of great amount of suspended particulate matters over the whole bay, negatively affects bottom animal communities decreasing their role in "marginal filter" of the Neva Estuary.
机译：在组成，生物量和在涅瓦湾底栖动物群落，成为在20世纪80年代中期淡水人工湖由于施工防洪屏障（坝）的功能模式长期波动，都依赖于自然和人为因素。的自然气候诱导因素的影响通过周期性高增加zoobenthic生物质与小软体动物的主导地位，Pisidiidae明证，在海湾东部涅瓦河（与颗粒有机物最高沉降率的区域）的Δ接近在多年的涅瓦河高的运行。它是通过定期大软体动物的主导地位，蚌在多年的涅瓦河低的运行成功，在涅瓦湾的其他部分。 20世纪以来的大概的开始观察到，由于在海湾增加水体富营养化和有机污染的丰冰川relicts，Pallasea quadrispinosa和寡毛纲蠕虫的增加逐渐降低。在有机物和在海湾磷的再生分解zoobenthic社区的功能作用是在1980年的高河运行的时期开始非常高。在这段时间里它们的食物消耗比在涅瓦湾初级生产高得多，它们的分解被涅瓦河水域带来的颗粒有机物质的主要部分。底栖动物中的有机物分解的作用已在过去二十年期间的期间低的运行的由于小Pisidiidae的主导地位的大蚌托架中的移位和浮游生物初级生产的增加而降低。大规模挖掘和处理在涅瓦湾，始于2006年，并导致了在整个海湾悬浮颗粒物的大量分布的东部新的土地和港口的建设海底沉积物的倾倒，造成负面影响底动物群落减少他们在涅瓦河口的“边缘过滤器”的作用。

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