MERCURY BIOACCUMULATION
; FUNDULUS-HETEROCLITUS
; METAL BIOACCUMULATION
; ATLANTIC SILVERSIDE
; MARINE FISH
; SALT-MARSH
; SPECIATION
; BIOAVAILABILITY
; MAINE
; KILLIFISH
WOS学科分类:
Environmental Sciences
WOS研究方向:
Environmental Sciences & Ecology
英文摘要:
Estuaries are dynamic ecosystems which vary widely in loading of the contaminant methylmercury (MeHg), and in environmental factors which control MeHg exposure to the estuarine foodweb. Inputs of organic carbon and rates of primary production are important influences on MeHg loading and bioaccumulation, and are predicted to increase with changes in climate and land use pressures. To further understand these influences on MeHg levels in estuarine biota, we used a field study approach in sites across different temperature regions, and with varying organic carbon levels. In paired comparisons of sites with high vs. low organic carbon, fish had lower MeHg bioaccumulation factors (normalized to water concentrations) in high carbon sites, particularly subsites with large coastal wetlands and large variability in dissolved organic carbon levels in the water column. Across sites, MeHg level in the water column was strongly tied to dissolved organic carbon, and was the major driver of MeHg concentrations in fish and invertebrates. Higher primary productivity (chlorophyll-a) was associated with increased MeHg partitioning to suspended particulates, but not to the biota. These findings suggest that increased inputs of MeHg and loss of wetlands associated with climate change and anthropogenic land use pressure will increase MeHg concentrations in estuarine food webs. (C) 2018 Elsevier Ltd. All rights reserved.
1.Dartmouth Coll, Dept Earth Sci, 6105 Sherman Fairchild Hall, Hanover, NH 03755 USA 2.Dartmouth Coll, Dept Biol Sci, Hanover, NH 03755 USA 3.Univ Connecticut, Dept Marine Sci, Groton, CT 06340 USA 4.Harvard John A Paulson Sch Engn & Appl Sci, Cambridge, MA USA
Recommended Citation:
Taylor, V. F.,Buckman, K. L.,Seelen, E. A.,et al. Organic carbon content drives methylmercury levels in the water column and in estuarine food webs across latitudes in the Northeast United States[J]. ENVIRONMENTAL POLLUTION,2019-01-01,246:639-649