Beyers D W, Sodergren C
Larval Fish Laboratory, Department of Fishery and Wildlife Biology, Colorado State University, Fort Collins, Colorado 80523, USA.
Arch Environ Contam Toxicol. 2002 Jan;42(1):53-9. doi: 10.1007/s002440010291.
This investigation evaluated effects of exposure of larval razorback sucker to waterborne and dietary selenium and other contaminants that occur in nursery habitats. Site waters were collected from three localities on the Colorado River near Grand Junction, CO; a total of five test waters (including control) were studied. Razorback sucker larvae were exposed to site-water contaminants via waterborne and dietary exposure using a laboratory food chain (algae, rotifer, razorback sucker). Fish were exposed for 28 days to site waters and food organisms cultured in site waters. Survival data were analyzed by inspection. Growth data were analyzed using analysis of variance to describe the response of fish in each site water and to describe the relative contribution of waterborne versus dietary exposure to constituents in site waters. Selenium concentrations in test-water treatments ranged from < 1 to 20.3 microg/L in water, < 0.702 to 21.8 microg/g in diet, and 2.34 to 42.0 microg/g in fish. Negative effects from dietary exposure to site-water constituents were detected, but the data suggest that they were caused by cocontaminants in the diet, not selenium exposure. Lack of detection of adverse effects from exposure does not imply that razorback sucker populations are not affected by increased environmental selenium concentrations. There are a variety of factors not included in this investigation that may influence sensitivity of razorback sucker populations to selenium.
本研究评估了将刀背麝香幼鱼暴露于育苗栖息地中水体和食物中的硒及其他污染物的影响。采集了科罗拉多州大章克申附近科罗拉多河三个地点的水样；共研究了五种测试水样（包括对照）。刀背麝香幼鱼通过实验室食物链（藻类、轮虫、刀背麝香幼鱼）经水体暴露和食物暴露接触水样中的污染物。将鱼暴露于水样及在水样中培养的食物生物中28天。通过检查分析存活数据。使用方差分析对生长数据进行分析，以描述每条鱼在各水样中的反应，并描述水体暴露与食物暴露对水样中成分的相对贡献。测试水样处理中的硒浓度范围为：水中<1至20.3微克/升，食物中<0.702至21.8微克/克，鱼体中2.34至42.0微克/克。检测到食物暴露于水样成分产生了负面影响，但数据表明这些影响是由食物中的共污染物引起的，而非硒暴露。未检测到暴露产生的不利影响并不意味着刀背麝香鱼种群未受到环境中硒浓度升高的影响。本研究未涵盖的多种因素可能会影响刀背麝香鱼种群对硒的敏感性。
