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首页> 外文期刊>Environmental Science & Technology >Field Estimates of Net Trophic Transfer of PCBs from Prey Fishes to Lake Michigan Salmonids
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Field Estimates of Net Trophic Transfer of PCBs from Prey Fishes to Lake Michigan Salmonids

机译:多氯联苯从猎物到密歇根湖鲑鱼的净营养转移的现场估计

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摘要

Dietary exposure is the principal source of polychlo-rinated biphenlys (PCBs) to Great Lakes salmonids. PCB transfer efficiency has typically been determined with laboratory studies using high food PCB concentrations and clean animals, making extrapolations to the field uncertain. Here, we present estimates of net PCB transfer efficiencies for Lake Michigan coho salmon, chinook salmon, and lake trout based on 15 years of PCB concentrations in these fish and their prey. Between 1975 and 1990, large changes in Lake Michigan's pelagic food web led to changes in coho and chinook salmon diets and chinook salmon growth efficiency. Early in this period, PCB transfer efficiencies increased in lake trout but decreased in chinook and coho salmon. These early trends carry relatively high uncertainty due to high variability in prey and predator PCB concentrations and are probably not ecologically significant. After 1983, PCB transfer efficiencies remained relatively constant at ~0.55 for lake trout and at ~0.60 for chinook salmon and increased slightly to ~0.50 for coho salmon. PCB transfer efficiencies appear to be little affected by changes in prey PCB concentration, shifts in prey type, and shifts in predator gross growth efficiency. Use of a constant PCB transfer efficiency in models that consider PCB accumulation by piscivorous fishes is therefore appropriate.
机译:饮食接触是大湖鲑鱼多氯联苯的主要来源。多氯联苯的转移效率通常是通过使用高浓度食品用多氯联苯和清洁动物进行的实验室研究确定的,因此无法推断对该领域的推断。在这里,我们根据这些鱼类及其猎物中15年的PCB浓度,估算了密歇根湖银大麻哈鱼,chinook鲑鱼和湖鳟的净PCB转移效率。在1975年至1990年之间,密歇根湖中上层食物网发生了巨大变化,导致银鳕鱼和奇努克鲑鱼的饮食方式以及奇努克鲑鱼的生长效率发生了变化。在这个时期的初期,湖鳟的PCB转移效率增加,但奇努克人和银大麻哈鱼的PCB转移效率却下降。这些早期趋势由于猎物和捕食者PCB浓度的高度可变性而具有相对较高的不确定性,并且可能在生态上不重要。 1983年之后,湖鳟的多氯联苯转移效率保持相对稳定,奇努克鲑鱼的PCB转移效率保持在〜0.60,银大麻哈鱼的PCB转移效率略有提高,达到〜0.50。 PCB转移效率似乎几乎不受猎物PCB浓度变化,猎物类型变化和捕食者总生长效率变化的影响。因此,在考虑食鱼鱼类PCB积累的模型中使用恒定的PCB转移效率是合适的。

著录项

  • 来源
    《Environmental Science & Technology》 |1996年第6期|p.1861-1865|共5页
  • 作者单位

    Center for Limnology, University of Wisconsin, 680 North Park Street, Madison, Wisconsin 53706;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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