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首页> 美国政府科技报告 >Integrated Study of Labelled Contaminant or Substrate-Biological Species Interactions in a Selected Aquatic Ecosystem. Part of a Coordinated Programme on Isotopic-Tracer Aided Research and Monitoring on Agricultural Residue - Biol
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Integrated Study of Labelled Contaminant or Substrate-Biological Species Interactions in a Selected Aquatic Ecosystem. Part of a Coordinated Programme on Isotopic-Tracer Aided Research and Monitoring on Agricultural Residue - Biol

机译：选定水生生态系统中标记污染物或基质 - 生物物种相互作用的综合研究。同位素示踪剂辅助农业残留研究和监测协调计划的一部分 - 生物学

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Repetitive exposure of a eutrophic fish pond ecosystem, enclosed in limnocorrals to 30 ppb parathion resulted in elimination of the potentially dominant zooplankton species, Moina micrura. Consequently, the populations of the rotifers Brachionus and Asplanchna markedly increased. Changes in the zooplankton composition and abundance were followed by increased fluctuations in phytoplankton biomass, phytoplankton photosynthesis, plankton respiration and community metabolism. Similar responses to parathion treatment were observed in previous studies under fish pond conditions. In the presence of fish the effect of parathion on the ecosystem was generally less pronounced and not uniform. The collapse of the zooplankton community and the rapid changes in limnological conditions in the control (untreated) limnocorrals severely limited the duration of the experiment. The results suggest that under eutrophic conditions, small enclosures may be useful for evaluation of the effect of toxicants on the ecosystem only in short term experiments with short liver chemicals. (Atomindex citation 14:729597)

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