Biological Mercury Hotspots in the Northeastern United States and Southeastern Canada

• Published in: Bioscience Vol. 57; no. 1; pp. 29 - 43
• Main Authors: EVERS, DAVID C, HAN, YOUNG-JI, DRISCOLL, CHARLES T, KAMMAN, NEIL C, GOODALE, M. WING, LAMBERT, KATHLEEN FALLON, HOLSEN, THOMAS M, CHEN, CELIA Y, CLAIR, THOMAS A, BUTLER, THOMAS
• Format: Journal Article
• Language: English
• Published: Circulation, AIBS, 1313 Dolley Madison Blvd., Suite 402, McLean, VA 22101. USA American Institute of Biological Sciences 01-01-2007; Oxford University Press
• Subjects: animal ecology; Aquatic birds; Aquatic ecosystems; Atmospherics; Bass; Bioaccumulation; biological mercury hotspots; Biota; common loon; Contamination; Datasets; Ecological effects; ecosystems; Emissions; Emissions control; Environmental health; environmental impact; Fish; Fluvial deposition; freshwater fish; habitat destruction; Indicator species; Loons; Mercury; mercury monitoring; mercury sources; Methylmercury; Methylmercury compounds; Natural resources; Organic Chemistry; OVERVIEW ARTICLES; Perca flavescens; plant ecology; Pollutant emissions; Risk; Sample size; Science; Surface water; Trout; water birds; Water pollution; Watersheds; Wildlife conservation; yellow perch; Canada; Northeastern United States; United States; USA, Massachusetts, Merrimack R; USA, Southeast; common loon; mercury monitoring; mercury sources; biological mercury hotspots; yellow perch
• ISSN: 0006-3568; 1525-3244
• DOI: 10.1641/B570107

Biological mercury (Hg) hotspots were identified in the northeastern United States and southeastern Canada using a data set of biotic Hg concentrations. Eight layers representing three major taxa and more than 7300 observations were used to locate five biological Hg hotspots and nine areas of concern. The yellow perch and common loon were chosen as indicator species for the human and ecological effects of Hg, respectively. Biological Hg hotspots receive elevated atmospheric Hg deposition, have high landscape sensitivity, and/or experience large reservoir fluctuations. In the Merrimack River watershed, local Hg emissions are linked to elevated local deposition and high Hg concentrations in biota. Time series data for this region suggest that reductions in Hg emissions from local sources can lead to rapid reductions of Hg in biota. An enhanced Hg monitoring network is needed to further document areas of high deposition, biological hotspots, and the response to emissions reductions and other mitigation strategies.