An experimental comparison of the effects of two chemical stressors on a freshwater zooplankton assemblage.
An experimental comparison of the effects of two chemical stressors on a freshwater zooplankton assemblage.
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DOI：
10.1016/0269-7491(94)90135-x
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发表时间：
1994
影响因子：
8.9
通讯作者：
Karl E. Havens
中科院分区：
文献类型：
--
作者：
Karl E. Havens
美国俄亥俄州湖泊的中生态系统被添加了十个浓度（0–100 μg l−1）的铜（实验 1）或西维因（实验 2）。培养 4 天后确定浮游动物的反应。这两种化学品的物种水平反应不同；社区层面的反应非常相似。随着铜或西维因剂量的增加，枝角类动物大大减少，桡足类动物占主导地位。对于西维因，反应与之前报道的一致。对于铜，之前在其他湖泊观察到了不同的反应。浮游动物的分类组成可能在很大程度上决定群落水平的反应。在目前的实验中，枝角动物的减少可能继而影响了食物网的功能。在西维因实验中，化学物质不直接抑制藻类，但藻类的生物量随着剂量水平的增加而增加。这与枝角类动物的减少同时发生，表明藻类对自上而下控制减少的反应。
Mesocosms in an Ohio, USA lake were dosed with ten levels (0–100 μg liter−1) of copper (experiment 1) or Carbaryl (experiment 2). Zooplankton responses were determined after 4-day incubations. Species level responses differed for the two chemicals; community level responses were very similar. Across the gradients of increasing Cu or Carbaryl doses, cladocerans were greatly reduced and copepods became dominant. For Carbaryl, the response was consistent with that reported previously. For Cu, different responses were previously observed at other lakes. The taxonomic composition of the zooplankton may largely determine the community level response. In the present experiments, cladoceran declines may have secondarily affected food web function. In the Carbaryl experiment, where the chemical did not directly suppress algae, their biomass increased with dose level. This coincided with the cladoceran decline, suggesting an algal response to reduced top-down control.