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Long-term trends in the macrozoobenthos of the Vistula Lagoon,southeastern Baltic Sea (Poland). Species composition and biomassdistribution

机译:东南波罗的海维斯杜拉泻湖的大型动物群的长期趋势。物种组成和生物量分布

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摘要

Drastic changes of the macrobenthos species composition was noted in the Vistula Lagoon (Poland) during the past century. Some species of bottom invertebrates, previously widely distributed in the lagoon, are either now rare or have disappeared. The biomass of zoobenthos increased several-fold this period. Until the end of the 1980s, the zoobenthos of the open waters of the lagoon did not exceed 20-36 g/ m super(2), but it increased to 81-103 g/m super(2) in the 1990s. Simultaneously, the thickness of the inhabited sediment layers increased from 10 to 20-25 cm. The spatial patterns of benthos biomass, both of vertical distribution in the sediment layer and horizontal distribution, changed significantly, mainly due to the introduction of the North American spionid polychaete Marenzelleria cf. viridis. The relations of these trends to hydrological changes, eutrophication, and bioinvasion are discussed.
机译:在过去的一个世纪中,维斯杜拉泻湖(波兰)注意到大型底栖动物种类组成的急剧变化。以前广泛分布在泻湖中的一些无脊椎动物种类现在很少见或已消失。这段时期,底栖动物的生物量增加了几倍。直到1980年代末,泻湖开放水域的底栖动物数量均未超过20-36 g / m super(2),但在1990年代增加到81-103 g / m super(2)。同时,居住沉积物层的厚度从10厘米增加到20-25厘米。底栖动物生物量的空间格局,无论是在沉积层中的垂直分布还是在水平分布中,都发生了显着变化,这主要是由于引入了北美带假性多毛鱼类Marenzelleriacf。绿藻。讨论了这些趋势与水文变化,富营养化和生物入侵的关系。

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