Bifenthrin Causes Trophic Cascade and Altered Insect Emergence in Mesocosms: Implications for Small Streams.
Bifenthrin Causes Trophic Cascade and Altered Insect Emergence in Mesocosms: Implications for Small Streams.
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DOI：
10.1021/acs.est.6b02761
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发表时间：
2016-10
影响因子：
11.4
通讯作者：
Holly A. Rogers;T. S. Schmidt;Brittanie L Dabney;M. Hladik;B. Mahler;P. V. Van Metre
中科院分区：
文献类型：
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作者：
Holly A. Rogers;T. S. Schmidt;Brittanie L Dabney;M. Hladik;B. Mahler;P. V. Van Metre
广泛使用的杀虫剂联苯菊酯对河流生态系统的直接和间接生态影响在很大程度上是未知的。为了研究这种影响，进行了一个操纵实验，在流介观生态系统中，水生昆虫群落的殖民地和暴露于联苯菊酯污染的沉积物;自然流的影响进行了解释，通过比较介观生态系统的结果，调查100中西部流，美国。在围隔生态系统实验中，联苯菊酯暴露的直接影响包括在以前认为对水生生物安全的浓度（EC 50范围为197.6至233.5纳克联苯菊酯/克有机碳）下，减少幼虫大型无脊椎动物的丰度、丰富度和生物量。间接影响包括一个营养级联，其中附着生物丰度增加后，大型无脊椎动物刮刀减少。成虫羽化动态和相应的陆地补贴在所有联苯菊酯浓度测试改变。这些结果外推到中西部流评估表明普遍的生态影响，改变出现动态可能在40%的流和营养级联在7%的流。这项研究提供了新的证据，一个共同的拟除虫菊酯可能会改变水生和陆地生态系统功能在区域尺度上。
Direct and indirect ecological effects of the widely used insecticide bifenthrin on stream ecosystems are largely unknown. To investigate such effects, a manipulative experiment was conducted in stream mesocosms that were colonized by aquatic insect communities and exposed to bifenthrin-contaminated sediment; implications for natural streams were interpreted through comparison of mesocosm results to a survey of 100 Midwestern streams, USA. In the mesocosm experiment, direct effects of bifenthrin exposure included reduced larval macroinvertebrate abundance, richness, and biomass at concentrations (EC50's ranged from 197.6 to 233.5 ng bifenthrin/g organic carbon) previously thought safe for aquatic life. Indirect effects included a trophic cascade in which periphyton abundance increased after macroinvertebrate scrapers decreased. Adult emergence dynamics and corresponding terrestrial subsidies were altered at all bifenthrin concentrations tested. Extrapolating these results to the Midwestern stream assessment suggests pervasive ecological effects, with altered emergence dynamics likely in 40% of streams and a trophic cascade in 7% of streams. This study provides new evidence that a common pyrethroid might alter aquatic and terrestrial ecosystem function at the regional scale.