Regulation of zooplankton composition and distribution by a zooplanktivorous fish in a shallow, eutrophic floodplain lake in south east Australia
Regulation of zooplankton composition and distribution by a zooplanktivorous fish in a shallow, eutrophic floodplain lake in south east Australia
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澳大利亚东南部浅水富营养化漫滩湖中食浮游动物鱼类对浮游动物组成和分布的调节
DOI：
10.1127/archiv-hydrobiol/146/1999/397
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
G. Closs
中科院分区：
文献类型：
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作者：
J. Lieschke;G. Closs
在一个浅水、富营养化的洪泛平原湖泊中，对澳大利亚胡瓜鱼（Retropinna semoni）的食性、鱼类和浮游动物的垂直分布和昼夜垂直迁移进行了研究。胡瓜鱼的食物主要是枝角类，尽管这种猎物在水柱中的丰度经常很低。哲水蚤桡足类是丰富的浮游动物群落在任何时候，但只形成了一个次要组成部分的胡瓜鱼饮食。各种浮游动物类群的垂直分布和昼夜垂直迁移模式似乎与胡瓜鱼的捕食强度有关。最严重的捕食枝水蚤类群往往留在更深的水，而轻微的捕食哲水蚤桡足类丰富的整个水柱在任何时候。这两个类群都没有表现出明显的昼夜垂直迁移。与此相反，枝藻类群遭受中间水平的捕食表现出显着的昼夜垂直迁移倾向于避免表面沃茨在白天。斯梅尔特似乎也表现出昼夜垂直迁移，很少有鱼被捕获的水柱在白天。对浮游动物的捕食模式和浮游动物的分布和丰富度表明，胡瓜鱼可能在调节浮游动物群落结构在澳大利亚东南部的低地栖息地的重要作用。
The diet of Australian smelt (Retropinna semoni) and the patterns of vertical distribution and diel vertical migration of fish and zooplankton were studied over a single Austral spring/summer in a shallow, eutrophic, floodplain lake. The diet of smelt was dominated by cladocera despite the frequently low abundances of such prey in the water column. Calanoid copepods were abundant in the zooplankton community at all times yet formed only a minor component of smelt diet. Patterns of vertical distribution and diel vertical migration exhibited by the various zooplankton taxa appeared to be related to the intensity of predation by smelt. The most heavily predated cladoceran taxa tended to remain in deeper water, whilst lightly predated calanoid copepods were abundant throughout the water column at all times. Neither taxon exhibited marked diel vertical migration. In contrast, cladoceran taxa suffering intermediate levels of predation exhibited marked diel vertical migration tending to avoid surface waters during the day. Smelt also appeared to exhibit diel vertical migration with few fish being caught in the water column during the day. The patterns of predation on zooplankton and the distribution and abundance of zooplankton suggest that smelt may play a significant role in regulating zooplankton community structure in the lowland habitats of south east Australia.