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Using bald eagles to indicate the health of the Great Lakes' environment

机译：用秃头鹰指示五大湖地区的健康状况

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摘要

The bald eagle (Haliaeetus leucocephalus) is one of the most studied birds of North America, and a great amount of natural life-history information, including the response of various stressors on the eagles' ability to reproduce, are well known. In Michigan, the eagle has been chosen to track the trends of bioaccumulative compounds of concern across watersheds in the state. The state has been divided into major watersheds, and 20% of these are surveyed each year. A control area in northern Minnesota, Voyageurs National Park, is also sampled annually. We report here on the methods used, the preliminary results of the 1999 field season, and how differences in mercury concentrations varied over a 10-year period. Mercury in feathers of nestling eagles declined over time only in Lakes Michigan and Huron, but have not decreased among other subpopulations in Michigan. Concentrations of polychlorinated biphenyls (PCBs) and 4,4'-DDE in blood plasma from nestling eagles have declined over time for most subpopulations; however, they remain greater for breeding areas associated with the Great Lakes' food web. Sea eagles of the genus Haliaeetus are a good sentinel species to track trends in bioaccumulative compounds in aquatic systems.
机译：秃鹰（Haliaeetus leucocephalus）是北美研究最多的鸟类之一，众所周知，许多自然生命史信息，包括各种应激因素对鹰繁殖能力的响应。在密歇根州，这只鹰被选中来追踪该州各流域内关注的生物蓄积性化合物的趋势。该州已被划分为主要分水岭，每年对其中的20％进行调查。明尼苏达州北部的Voyageurs国家公园也是一个控制区，每年都进行采样。我们在此报告使用的方法，1999年田间季节的初步结果以及汞浓度差异在10年内的变化。随时间推移，雏鹰羽毛中的汞含量仅在密歇根湖和休伦湖有所下降，而在密歇根州的其他亚种群中却没有下降。随着时间的推移，大多数亚群的雏鹰血浆中多氯联苯（PCBs）和4,4'-DDE的浓度已经下降。但是，在与大湖区食物网相关的繁殖地区，它们仍然更大。 Haliaeetus属的海鹰是很好的前哨物种，可以追踪水生系统中生物蓄积性化合物的趋势。

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