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Ecological Legacy of DDT Archived in Lake Sediments from Eastern Canada

机译：滴滴涕在加拿大东部湖泊沉积物中存档的生态遗产

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摘要

Historic forest management practices led to widespread aerial application of insecticides, such as dichlorodiphenyltrichloroethane (DDT), to North American conifer forests during similar to 4950-1970. Lake basins thus may provide an important archive of inputs and aquatic responses to these organochlorines. We use dated sediment cores from five study lakes in multiple watersheds in New Brunswick (NB), Canada, to provide a regional paleo-ecotoxicological perspective on this potential legacy stressor in remote lake ecosystems. Peak sedimentary levels of p,p'- and o,p'-DDT (Sigma DDT) and breakdown products Sigma DDE (dichlorodiphenyldichloroethylene) and Sigma DDD (dichlorodiphenyldichloroethane) generally occurred during the 1970s to 1980s. Sediments exceeded probable effect levels (PELs) by similar to 450 times at the most impacted lake. Modern sediments in all study lakes still contained levels of DDT-related compounds that exceed PELs. For the first time, we show that aerial applications of DDT to eastern Canadian forests likely resulted in large shifts to primary consumers within several lake food webs, principally through lake-specific impacts on zooplankton community composition. Modern pelagic zooplankton communities are now much different compared to communities present before DDT use, suggesting that a regional organochlorine legacy may exist in the modern food webs of many remote NB lakes.
机译：历史森林管理实践导致杀虫剂的广泛空中应用，如二氯噻吩基三氯乙烷（DDT），与4950-1970相似的北美针叶树林。因此，湖泊盆地可以提供对这些有机氯的输入和水生反应的重要档案。我们在加拿大新不伦瑞克（NB）的多个流域中的五个研究湖泊中使用了日期的沉积物核心，为偏远湖生态系统中的这种潜在的传统压力源提供了一种区域古生态毒理学视角。 P，P'-和O，P'-DDT（Sigma DDT）和击穿产品Sigma DDE（二氯二苯基二氯乙烯）和Sigma DDD（二氯二苯基二氯乙烷）的峰沉积水平通常在20世纪70年代至20世纪80年代中出现。沉积物超出可能的效果水平（PELS）在最受影响的湖泊中的450次。所有研究中的现代沉积物仍然含有患DDT相关的化合物的水平，这些化合物的含量超过皮塞。我们首次表明DDT到加拿大森林的空中应用可能导致几个湖泊食品网内的主要消费者转移，主要是通过对浮游动物群落组成的湖泊特异性影响。与DDT使用前的社区相比，现代的Pelagic Zooplankton社区现在与当前的社区相比有所不同，这表明在许多远程NB湖泊的现代食品网中可能存在区域有机氯遗产。

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  • 来源
    《Environmental Science & Technology》 |2019年第13期|7316-7325|共10页
  • 作者

    Kurek Joshua; MacKeigan Paul W.; Veinot Sarah; Mercer Angella; Kidd Karen A.;

  • 作者单位

    Mt Allison Univ Dept Geog & Environm 144 Main St Sackville NB E4L 1A7 Canada;

    Mt Allison Univ Dept Geog & Environm 144 Main St Sackville NB E4L 1A7 Canada;

    Univ New Brunswick Canadian Rivers Inst 100 Tucker Pk Rd St John NB E2L 4L5 Canada|Univ New Brunswick Dept Biol Sci 100 Tucker Pk Rd St John NB E2L 4L5 Canada;

    Univ New Brunswick Canadian Rivers Inst 100 Tucker Pk Rd St John NB E2L 4L5 Canada|Univ New Brunswick Dept Biol Sci 100 Tucker Pk Rd St John NB E2L 4L5 Canada;

    Univ New Brunswick Canadian Rivers Inst 100 Tucker Pk Rd St John NB E2L 4L5 Canada|Univ New Brunswick Dept Biol Sci 100 Tucker Pk Rd St John NB E2L 4L5 Canada|McMaster Univ Dept Biol 1280 Main St West Hamilton ON L8S 4K1 Canada|McMaster Univ Sch Geog & Earth Sci 1280 Main St West Hamilton ON L8S 4K1 Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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