Variable Background Flow on Aquatic Toxicant Exposure Alters Foraging Patterns on Crayfish
Variable Background Flow on Aquatic Toxicant Exposure Alters Foraging Patterns on Crayfish
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DOI：
10.1007/s00128-019-02707-w
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发表时间：
2019-08
影响因子：
2.7
通讯作者：
Fatima Alacantara;Kristi K. Weighman;P. Moore
中科院分区：
文献类型：
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作者：
Fatima Alacantara;Kristi K. Weighman;P. Moore
预计气候变化将改变全球和区域范围的水文循环，影响流入溪流生境的地下水和地表水。在美国中西部，投入的数量和频率预计将变得越来越多变。这一地区农业生产率很高，为杀虫剂和除草剂进入水生生态系统创造了巨大的潜力。异丙甲草胺是一种用于玉米和大豆作物的除草剂，已被证明会污染该区域的地表水和地下水。本研究探讨了可变的流量条件对环境相关浓度的异丙甲草胺在中西部河流中发现的大型无脊椎动物，锈色小龙虾（Faxonius rusticus）的毒性的影响。采用混合模型ANCOVA分析了螯虾觅食行为的变化。在有毒物质暴露，小龙虾显着增加了他们的消费量的水生植物，但只有在可变的流量制度。因此，在毒物暴露的变化增加影响小龙虾觅食行为比其他流量制度。流动制度和异丙甲草胺暴露之间的这种显着的相互作用表明，更大的变化，在有毒物质输入流可能会导致更严重的变化，暴露的生物体的行为。
Climate change is expected to alter hydrological cycles on global and regional scales, impacting groundwater and surface water inputs to stream habitats. In the midwestern United States, the volume and frequency of inputs are expected to become increasingly variable. This region has a high incidence of agriculture, creating enormous potential for transport of pesticides and herbicides into aquatic ecosystems. Metolachlor, an herbicide for corn and soybean crops, has been demonstrated to contaminate surface water and groundwater in the region. This study examines the impact of variable flow conditions on the toxicity of environmentally relevant concentrations of metolachlor in a macroinvertebrate found in midwestern streams, the rusty crayfish (Faxonius rusticus). Changes in crayfish foraging behavior were analyzed using a Mixed Model ANCOVA. Under toxicant exposure, crayfish significantly increased their consumption of macrophytes, but only under the variable flow regime. Thus, the increased variability in toxicant exposure impacted crayfish foraging behavior more than other flow regimes. This significant interaction between flow regime and metolachlor exposure suggests that the greater variability in toxicant inputs to streams may lead to more severe changes in behavior for exposed organisms.