Recovery of Stream Ecosystems from Insecticide Treatment andDrought

小山溪中有机质和营养盐动态 位于北卡罗来纳州西部的考维塔水文实验室将 被研究。 控制这些动态的两个因素是 已考虑-无脊椎动物消费者（即水生碎叶动物 昆虫活动和干旱。 据推测， 小溪流中的有机物和营养物的处理器。 这一假设将通过比较有机质和 未处理溪流中的营养动态与溪流中的营养动态 其中水生昆虫已经用杀虫剂除去。 在研究期间，杀虫剂处理将 停止和恢复之间的关系 无脊椎动物消费群体和有机物的变化， 这些溪流中的营养物动态将被跟踪。 考维塔水文站的干旱状况普遍存在 实验室自1984年以来，并在此期间取得了数据 河流有机物和养分动态。 继续 对这些动力学的研究将进一步记录小溪流 生态系统对干旱条件的反应;如果水文 政权应该恢复“正常”，研究将记录 从干旱中恢复这些系统。 本研究是 重要的是，因为很少有信息存在的影响， 干旱对溪流中有机物和养分动态的影响。 这些研究将使用经过验证的实验室进行， 现场技术 华莱士博士和他的同事，韦伯斯特博士 和Suberkropp，有良好的研究记录和机构 对工作的支持是高质量的。

Organic matter and nutrient dynamics in small mountain streams at the Coweeta Hydrologic Laboratory in western North Carolina, will be studied. Two factors controlling these dynamics will be considered - invertebrate consumer (i.e. leafshredding aquatic insects) activity and drought. Leaf-shredding aquatic insects are hypothesized to be major processors of organic matter and nutrients in small streams. This hypothesis will be tested by comparing organic matter and nutrient dynamics in unmanipulated streams with those in streams from which aquatic insects have been removed with insecticides. Part-way through the study period the insecticide treatment will be halted and the relationship between the recovery of the invertebrate consumer community and changes in organic matter and nutrient dynamics in these streams will be followed. Drought conditions have prevailed at the Coweeta Hydrologic Laboratory since 1984, and data have been taken over this period on stream organic matter and nutrient dynamics. Continued studies of these dynamics will further document the small-stream ecosystem responses to drought conditions; and if the hydrologic regime should return to "normal," the studies would document recovery of these systems from drought. This research is important since very little information exists on the effects of drought on organic matter and nutrient dynamics in streams. The studies will be conducted using well-proven laboratory and field techniques. Dr. Wallace and his colleagues, Drs. Webster and Suberkropp, have good research records and the institutional support for the work is of high quality.