...
首页> 外文期刊>Environmental Science & Technology >Selenium Bioaccumulation and Maternal Transfer in the Mayfly Centroptilum triangulifer in a life-Cycle, Periphyton-Biofilm Trophic Assay
【24h】

Selenium Bioaccumulation and Maternal Transfer in the Mayfly Centroptilum triangulifer in a life-Cycle, Periphyton-Biofilm Trophic Assay

机译:生命周期,附生生物膜生物膜营养测定中May蝇三角藻中硒的生物富集和母体转移

获取原文
获取原文并翻译 | 示例
           

摘要

Selenium contamination in aquatic ecosystems provides management challenges because bioaccumulation in animals is largely a function of dietary exposure, whereas regulatory entities have traditionally focused on direct water to organism interactions. Selenium is known to be readily absorbed by primary producers and can potentially biomagnify in food webs and elicit adverse effects in higher trophic levels. However, selenium bioaccumulation in the invertebrate prey of many predatory animals is poorly understood. Here, we used ~(75)Se (as selenite) as a radiotracerto characterize Se bioaccumulation into natural periphyton biofilms and subsequent dietary and maternal transfer in the mayfly, Centroptilum triangulifer, in a life-cycle assay. On average periphyton biofilms bioconcentrated selenium 1113 (±430)-fold following 7-9 days of exposure to a range of environmentally relevant dissolved concentrations (2.4-13.9 μg L~(-1)). Mayflies grown to adulthood on these diets further biomagnified Se with trophic transfer factors averaging 2.2 (±0.4)-fold in postpartum maternal tissues. Adults then transferred 46.5 (±8.8) % of their body burdens to eggs with an observed reduction in fecundity for mayflies fed on diets greater than ~11 /
机译:水生生态系统中的硒污染带来了管理上的挑战,因为动物体内的生物蓄积在很大程度上是饮食摄入的函数,而传统上,监管机构则专注于水与生物之间的直接相互作用。众所周知,硒容易被初级生产者吸收,并可能在食物网中被生物放大,并在营养水平较高时引起不利影响。但是,人们对许多掠食性动物的无脊椎动物猎物中硒的生物蓄积知之甚少。在这里,我们使用〜(75)Se(作为亚硒酸盐)作为放射性示踪剂,在生命周期分析中表征硒在天然附生生物膜中的生物富集以及随后在膳食中的膳食和母体转移,即黄Centr(Centroptilum triangulifer)。在暴露于一系列环境相关的溶解浓度(2.4-13.9μgL〜(-1))7-9天后,平均周生生物膜对硒的生物浓缩度为1113(±430)倍。在这些饮食中长成的五月花进一步硒被生物放大,在产后母体组织中的营养转移因子平均达到2.2(±0.4)倍。然后,成年人将其体重的46.5(±8.8)%转移到了鸡蛋上,观察到饲喂大于〜11 /

著录项

  • 来源
    《Environmental Science & Technology》 |2009年第20期|7952-7957|共6页
  • 作者单位

    Department of Environmental and Molecular Toxicology, North Carolina State University, Raleigh, North Carolina 27695;

    Stroud Water Research Center, Avondale, Pennsylvania 19311;

    Department of Environmental and Molecular Toxicology, North Carolina State University, Raleigh, North Carolina 27695;

  • 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
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号