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Analysis of the inland cladocerans of Flanders (Belgium) -Inferring changes over the past 70 years

机译:法兰德斯(比利时)内陆锁骨的分析-推断过去70年的变化

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摘要

The four crustacean orders of the cladocerans represent, together with copepocls and rotifers, the most common zooplankton taxa in all types of lentic freshwater bodies (1). They exhibit a parthenogenetic (clonal) reproduction mode during periods of favourable environmental conditions, and produce sexual dormant eggs (ephippia) when conditions deteriorate (2). As such they are capable of remaining dormant in the habitat for decades (3). Because of their capacity for rapid population growth, some pelagic members of the group (especially the large-bodied Daphnia and Diaphanosorna) are able of keeping water bodies in a clear water state by grazing down the phytoplankton (4). Most species feed on bacteria, protists, periphyton, and detritus (many chydorids and macrothric-ids), some are parasitic (e.g. Anchistropus on the polyp Hydra) or predacious on small-sized zooplankton (e.g. Leptodora and Polyphemus) (5; 6). Cladocerans themselves are a main food source for fish, macro-invertebrates, and amphibians (7).
机译:锁骨的四个甲壳纲动物,连同pe足类和轮虫类,代表了所有类型的透镜状淡水体中最常见的浮游动物类群(1)。它们在有利的环境条件下表现出孤雌生殖(克隆)繁殖方式,并在条件恶化时产生性休眠卵(ephippia)(2)。因此,它们能够在栖息地中保持数十年的休眠状态(3)。由于它们具有快速种群增长的能力,该组的一些远洋成员(尤其是大型水蚤和水蚤)能够通过放牧浮游植物使水体保持清澈的水质(4)。大多数物种以细菌,原生生物,附生植物和碎屑为食(许多梭子鱼和巨蠕虫),有些是寄生的(例如息肉蛇类上的嗜chi鱼类)或在小型浮游动物(例如Leptodora和Polyphemus)上捕食(5; 6) 。锁骨本身是鱼类,大型无脊椎动物和两栖动物的主要食物来源(7)。

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