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首页> 外文期刊>Environmental toxicology and chemistry >A FIELD ASSESSMENT OF LONG-TERM LABORATORY SEDIMENT TOXICITY TESTS WITH THE AMPHIPOD HYALELLA AZTECA
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A FIELD ASSESSMENT OF LONG-TERM LABORATORY SEDIMENT TOXICITY TESTS WITH THE AMPHIPOD HYALELLA AZTECA

机译：两栖透明藻长期实验室沉积物毒性试验的现场评估。

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Response of the amphipod Hyalella azteca exposed to contaminated sediments for 10 to 42 d in laboratory toxicity tests was compared to responses observed in controlled three-month invertebrate colonization exposures conducted in a pond. Sediments evaluated included a sediment spiked with dichlorodiphenyldichloroethane (DDD) or dilutions of a field sediment collected from the Grand Calumet River (GCR) in Indiana (USA) (contaminated with organic compounds and metals). Consistent effects were observed at the highest exposure concentrations (400 μg DDD/goc [DDD concentrations normalized to grams of organic carbon (goc) in sediment] or 4% GCR sediment) on survival, length, and reproduction of amphipods in the laboratory and on abundance of invertebrates colonizing sediments in the field. Effect concentrations for DDD observed for 10-d length and 42-d reproduction of amphipods (e.g., chronic value [ChV] of 66 μg DDD/goc and 25% inhibition concentration [IC25] of 68 μg DDD/goc for reproduction) were similar to the lowest effect concentrations for DDD measured on invertebrates colonizing sediment the field. Effect concentrations for GCR sediment on 28-d survival and length and 42-d reproduction and length of amphipods (i.e., ChVs of 0.20-0.66% GCR sediment) provided more conservative effect concentrations compared to 10-d survival or length of amphipods in the laboratory or the response of invertebrates colonizing sediment in the field (e.g., ChVs of 2.2% GCR sediment). Results of this study indicate that use of chronic laboratory toxicity tests with H. azteca and benthic colonization studies should be used to provide conservative estimates of impacts on benthic communities exposed to contaminated sediments. Bioaccumulation of DDD by oligochaetes colonizing the DDD-spiked sediment was similar to results of laboratory sediment tests previously conducted with the oligochaete Lumbriculus variegates, confirming that laboratory exposures can be used to estimate bioaccumulation by oligochaetes exposed in the field.
机译：将在实验室毒性试验中暴露于受污染沉积物10天至42天的两栖类透明质Hyalella azteca的反应与在池塘中进行的为期三个月的无脊椎动物定殖暴露中观察到的反应进行了比较。评估的沉积物包括掺有二氯二苯基二氯乙烷（DDD）的沉积物或从美国印第安纳州大卡卢梅特河（GCR）收集的田间沉积物的稀释液（被有机化合物和金属污染）。在最高暴露浓度下（400μgDDD / goc [DDD浓度标准化为沉积物中有机碳克（goc）的含量]或4％GCR沉积物），在实验室内和两栖类动物的存活，长度和繁殖方面均观察到一致的影响。大量无脊椎动物栖息在田间沉积物中。在两栖类动物的10天长度和42天繁殖中观察到的DDD效应浓度（例如，慢性值[ChV]为66μgDDD / goc和25％抑制浓度[IC25]为68μgDDD / goc繁殖）相似到在无脊椎动物定居在沉积物中的DDD的最低影响浓度。 GCR沉积物对两栖动物28 d生存和长度以及42 d繁殖和长度的影响浓度（即ChV为0.20-0.66％GCR沉积物）提供了比10 d生存或两栖动物长度更长的保守效果浓度。实验室或无脊椎动物在野外沉积物中的反应（例如，ChV为2.2％的GCR沉积物）。这项研究的结果表明，应使用对阿兹台克人的慢性实验室毒性试验和底栖生物定殖研究，以提供对暴露于受污染沉积物的底栖生物群落影响的保守估计。低聚藻类在DDD掺入的沉积物中定居，其DDD的生物蓄积性与以前用低聚褐藻的杂色藻进行的实验室沉积物测试结果相似，证实了实验室暴露可用于估计野外暴露的低聚藻类的生物蓄积性。

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