文章基本信息

标题：Inhibition of Algae and Invertebrates by Malathion from Insecticide-Diffusing Substrata
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作者：Steven N. Francoeur ; Barry J.F. Biggs ; Rex L. Lowe 等
期刊名称：Journal of Freshwater Ecology
印刷版ISSN：0270-5060
电子版ISSN：2156-6941
出版年度：1999
卷号：14
期号：2
页码：179-186
DOI：10.1080/02705060.1999.9663669
出版社：Taylor & Francis
摘要：The organophosphorus insecticide malathion has been used in insecticide-diffusing substrata (IDS) to reduce aquatic insect colonization and grazing activity, thereby facilitating study of stream ecosystem function. Although there has been some concern that malathion may provide a source of P, previous investigators have assumed that malathion has no direct inhibitory effect on algae. In a seasonal study of 12 New Zealand streams, malathion exposure frequently caused significant decreases in algal biomass accrual. Inhibition of algal biomass accrual by malathion was more severe under conditions of enhanced nutrient supply. Malathion exposure also substantially reduced insect densities. However, statistically significant invertebrate responses to malathion exposure were uncommon because of high variability of insect densities on IDS. These results suggest that 1) direct inhibition of algal biomass accrual by malathion in IDS should not be discounted, and 2) malathion-induced reductions in insect density and grazing pressure on IDS may be spatially variable and difficult to detect without extensive replication.