Abstract

The ambivalence of planktonic invaders has been studied using the example of ecosystem effects of the invasive cladoceran Cercopagis pengoi (Ostroumov, 1891) in the Vistula Lagoon of the Baltic Sea. The influence of the invader on the taxonomic structure and productivity of plankton is studied. It is discovered that, in the long term, the predation pressure of C. pengoi on zooplankton has decreased; the abundance, biomass, and production of the dominant species of Rotifera, Cladocera, and Copepoda also declined. The ne-gative impact of C. pengoi on the planktonic community is reflected in a reduction in the food supply of juvenile Baltic herring and other planktivorous fish. The wide ecological niche of Cercopagis contributes to the expansion of its range, which can lead to a reduction in populations of phytophagous crustaceans, increased harmful algae blooms, and the further deterioration of the food supply of fish.

中文翻译：

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浮游入侵者的矛盾心理与群落的转变

摘要

以波罗的海维斯瓦泻湖的入侵枝角动物Cercopagis pengoi (Ostroumov, 1891)的生态系统影响为例，研究了浮游入侵者的矛盾心理。研究了入侵者对浮游生物分类结构和生产力的影响。研究发现，从长远来看，企鹅企鹅对浮游动物的捕食压力有所下降；轮虫类、枝角类和桡足类优势种的丰度、生物量和产量也下降。C. pengoi对浮游生物群落的负面影响体现在波罗的海鲱鱼和其他食浮游鱼类的食物供应减少上。Cercopagis广泛的生态位有助于其范围的扩大，这可能导致植食性甲壳类动物数量的减少、有害藻类繁殖的增加以及鱼类食物供应的进一步恶化。