Impact of lambda-cyhalothrin on a macroinvertebrate assemblage in outdoor experimental channels: implications for ecosystem functioning.
Impact of lambda-cyhalothrin on a macroinvertebrate assemblage in outdoor experimental channels: implications for ecosystem functioning.
复制标题
高效氯氟氰菊酯对户外实验渠道中大型无脊椎动物群落的影响：对生态系统功能的影响。
DOI：
10.1016/j.aquatox.2008.09.003
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发表时间：
2008
影响因子：
4.5
通讯作者：
S. Larsen
中科院分区：
文献类型：
--
作者：
J. Rasmussen;N. Friberg;S. Larsen
在这项研究中，在室外实验河道中，测试了拟除虫菊酯一次脉冲对大型无脊椎动物群落的影响，该群落由Gammarus Pulex、Leuctra ngra、七子虫和河蟹组成。渠道(长4m，宽0.1m)为地下水补给，有天然基质。在实验室将大型无脊椎动物暴露于10.65或106.5ngL−-1lambda氯氟氰菊酯中90min，24小时后引入实验流道，每个处理和对照各重复4次。每隔24小时采集漂流样本10天，并对漂流大型无脊椎动物的行为进行评估。微藻生物量在第1、5、8、10天用山毛榉(Fagus Sylvatica)的叶包进行了测定，同时测定了叶凋落物的分解。随着高效氯氟氰菊酯浓度的增加，迁移率降低的白纹伊蚊和黑纹伊蚊的漂浮数量显著增加。与对照组和10.65ngL−-1处理组相比，106.5ngL-−-1组河道中藻类生物量的增加幅度更大。与暴露大型无脊椎动物的航道相比，控制航道中微藻生物量的积累显着增加，叶凋落物的分解显着增加。这项研究可以将有价值的知识应用于了解和评估拟除虫菊酯如何影响溪流中的生态系统功能。
In this study, the impact of a single pulse of the pyrethroid lambda-cyhalothrin was tested on a macroinvertebrate assemblage consisting of Gammarus pulex, Leuctra nigra, Heptagenia sulphurea and Ancylus fluviatilis in outdoor experimental stream channels. Channels (4m long, 0.1m wide) were groundwater fed and had natural substratum. Macroinvertebrates were exposed to 10.65 or 106.5ngL−1lambda cyhalothrin for 90min in the laboratory and after 24h introduced to the experimental stream channels with four replicates of each treatment and controls. Drift samples were taken with 24-h interval for 10 days and behaviour of drifted macroinvertebrates was assessed. Microalgae biomass was measured on days 1, 5, 8 and 10 along with leaf litter decomposition using leaf packs of beech (Fagus sylvatica). Numbers of drifting G. pulex and L. nigra with reduced mobility increased significantly with concentration of lambda-cyhalothrin. Increase of algal biomass was significantly greater in stream channels with macroinvertebrates exposed to 106.5ngL−1compared to controls and 10.65ngL−1treatments. Accrual of microalgal biomass was significantly higher in the high concentration treatment and decomposition of leaf litter was significantly greater in control channels compared to channels with exposed macroinvertebrates. This study may apply valuable knowledge to the understanding and assessment of how pyrethroids impact ecosystem functioning in streams.