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首页> 外文期刊>Journal of great lakes research >Assessing condition of macroinvertebrate communities and sediment toxicity in the St. Lawrence River at Massena Area-of-Concern
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Assessing condition of macroinvertebrate communities and sediment toxicity in the St. Lawrence River at Massena Area-of-Concern

机译：关注马塞纳地区圣劳伦斯河大型无脊椎动物群落状况和沉积物毒性

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摘要

In 1972, the USA and Canada agreed to restore the chemical, physical, and biological integrity of the Great Lakes ecosystem under the first Great Lakes Water Quality Agreement. In subsequent amendments, part of the St. Lawrence River at Massena, New York and segments of three tributaries, were designated as an Area of Concern (AOC) due to the effects of polychlorinated biphenyls (PCBs), lead and copper contamination, and habitat degradation and resulting impairment to several beneficial uses. Because sediments have been largely remediated, the present study was initiated to evaluate the current status of the benthic macroinvertebrate (benthos) beneficial use impairment (BUI). Benthic macroinvertebrate communities and sediment toxicity tests using Chironomus dilutus were used to test the hypotheses that community condition and sediment toxicity at AOC sites were not significantly different from those of adjacent reference sites. Grain size was found to be the main driver of community composition and macroinvertebrate assemblages, and bioassessment metrics did not differ significantly between AOC and reference sites of the same sediment class. Median growth of C dilutus and its survival in three of the four river systems did not differ significantly in sediments from AOC and reference sites. Comparable macroinvertebrate assemblages and general lack of toxicity across most AOC and reference sites suggest that the quality of sediments should not significantly impair benthic macroinvertebrate communities in most sites in the St. Lawrence River AOC. (C) 2016 International Association for Great Lakes Research. Published by Elsevier B.V. All rights reserved.
机译：1972年，美国和加拿大同意根据第一份《大湖水质量协议》恢复大湖生态系统的化学，物理和生物完整性。在随后的修订中，由于多氯联苯（PCB），铅和铜污染以及栖息地的影响，纽约马塞纳的圣劳伦斯河的一部分和三个支流的部分被指定为关注区域（AOC）退化并因此损害了几种有益的用途。由于沉积物已得到很大程度的修复，因此开始本研究以评估底栖大型无脊椎动物（底栖动物）有益使用障碍（BUI）的现状。底栖大型无脊椎动物群落和使用稀释性Chironomus dilutus进行的沉积物毒性测试用于检验以下假设：AOC地点的群落条件和沉积物毒性与相邻参考地点没有显着差异。发现粒度是群落组成和大型无脊椎动物集合的主要驱动力，并且AOC和相同沉积物类别的参考位点之间的生物评估指标没有显着差异。在四个河流系统中的三个中，稀释稀释碳的中位生长及其存活率在来自AOC和参考点的沉积物中没有显着差异。在大多数AOC和参考地点中，大型无脊椎动物组合具有可比性，并且普遍缺乏毒性，这表明在圣劳伦斯河AOC的大多数地点，沉积物的质量不应显着损害底栖大型无脊椎动物群落。 （C）2016年国际大湖研究协会。由Elsevier B.V.发布。保留所有权利。

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