Airas Sari, Leppänen Matti, Kukkonen Jussi V K
Faculty of Biosciences, University of Joensuu, PO Box 111, 80101 Joensuu, Finland.
Ecotoxicol Environ Saf. 2008 Jul;70(3):475-82. doi: 10.1016/j.ecoenv.2007.06.004. Epub 2007 Dec 3.
Joint effects of temperature and oxygen concentrations for the results of sediment toxicity tests were studied at 10 and 20 degrees C with 40% and 80% dissolved oxygen (DO) saturation. Growth, feeding rate, and reproduction of Lumbriculus variegatus (Oligochaete) and growth, emergence, and survival of Chironomus riparius (Diptera) were tested in a polluted and in a reference sediment. Both the feeding of L. variegatus and the emergence of C. riparius were significantly retarded at low temperature. Additionally, differences in the sex ratio of the emerged adults of C. riparius were observed. The oxygen concentration alone did not have any significant effect on the endpoints, but significant combined effects of polluted sediment and low DO were observed on the biomass of L. variegatus. The standard sediment toxicity tests might offer only limited data for risk assessment of contaminated sediments at sites where the actual conditions largely differ from the laboratory conditions.
在10摄氏度和20摄氏度、溶解氧（DO）饱和度分别为40%和80%的条件下，研究了温度和氧浓度对沉积物毒性试验结果的联合影响。在受污染沉积物和参考沉积物中，对颤蚓（寡毛纲）的生长、摄食率和繁殖以及摇蚊（双翅目）的生长、羽化和存活进行了测试。在低温下，颤蚓的摄食和摇蚊的羽化均显著延迟。此外，还观察到羽化后的摇蚊成虫性别比例存在差异。单独的氧浓度对各项终点指标没有显著影响，但在受污染沉积物和低溶解氧条件下，观察到对颤蚓生物量有显著的联合影响。对于实际条件与实验室条件差异很大的场地，标准沉积物毒性试验可能只能为受污染沉积物的风险评估提供有限的数据。
