Is there an interaction of the effects of salinity and pesticides on the community structure of macroinvertebrates?
Is there an interaction of the effects of salinity and pesticides on the community structure of macroinvertebrates?
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DOI：
10.1016/j.scitotenv.2012.07.066
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
Eduard Szöcs;B. Kefford;R. Schäfer
中科院分区：
文献类型：
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作者：
Eduard Szöcs;B. Kefford;R. Schäfer
淡水生态系统的盐碱化是一个全球性问题，影响到全世界许多地区，并可能与农业地区的农药同时发生。鉴于这两种压力都能影响大型无脊椎动物群落，它们的影响可能会相互作用。我们调查了盐度和农药的影响，在24个地点在南部维多利亚，澳大利亚东南部的农业地区。我们使用基于距离的冗余分析，以确定农药，盐度和其他环境变量对大型无脊椎动物群落组成的影响。盐度和农药毒性有一个统计学上显着的影响，社区的基板组成和采样流达到池和浅滩部分的百分比。我们没有发现盐度和农药之间的相互作用的证据，即这些变量之一的影响并不取决于其他的水平。然而，我们的研究结果表明，盐渍化和暴露于农药可以在农业区的大型无脊椎动物群落结构的主要因素。农药毒性作用在较低的分类水平相比，盐度，可能表明进化适应盐度胁迫。
Salinization of freshwater ecosystems is a global problem affecting many regions worldwide and can co-occur with pesticides in agricultural regions. Given that both stressors are potent to affect macroinvertebrate communities, their effects could interact. We investigated the effects of salinity and pesticides at 24 sites in an agricultural region of southern Victoria, South-East Australia. We used distance-based redundancy analysis to determine the influence of pesticides, salinity and other environmental variables on the composition of macroinvertebrate communities. Salinity and pesticide toxicity had a statistically significant effect on communities as had the substrate composition and the percentage of pool and riffle sections in the sampled stream reaches. We did not find evidence for interactive effects between salinity and pesticides, i.e. the effect of one of these variables did not depend on the level of the other. Nevertheless, our results show that salinization and exposure to pesticides can be major factors for the structure of macroinvertebrate communities in agricultural regions. Pesticide toxicity acted on a lower taxonomic level compared to salinity, potentially indicating evolutionary adaptation to salinity stress.