mercury bioaccumulation Articles

Mercury Bioaccumulation in Northern Two-lined Salamanders from Streams in the Northeastern United States

Mercury (Hg) bioaccumulation in salamanders has received little attention despite widespread Hg contamination of aquatic ecosystems and worldwide amphibian declines. Here we report concentrations of methyl Hg (MeHg) and total Hg in larval northern two-lined salamanders (Eurycea bislineata bislineata) collected from streams in Acadia National Park (ANP), Maine, and Bear Brook Watershed, Maine ...

Mar. 1, 2005

By Springer-Verlag GmbH

Habitat‐specific foraging and sex determine mercury concentations in sympatric benthic and limnetic ecotypes of threespine stickleback

Mercury (Hg) is a widespread environmental contaminant known for the neurotoxicity of the methylated forms, especially monomethyl mercury, which bioaccumulates and biomagnifies in aquatic food webs. Mercury bioaccumulation and biomagnification rates are known to vary among species utilizing different food webs (benthic versus limnetic) within and between systems. We assessed if carbon and ...

Mar. 1, 2013

By John Wiley & Sons, Ltd.

Species‐specific mercury bioaccumulation in a diverse fish community

Mercury bioaccumulation models developed for fish provide insight into the sources and transfer of Hg within ecosystems. Mercury concentrations were assessed for 16 fish species of the western reach of Lake Diefenbaker, Saskatchewan, Canada. For top‐predators (northern pike Esox lucius, walleye Sander vitreum), Hg concentrations were positively correlated to δ15N, and δ15N to fish age ...

Jun. 26, 2015

By John Wiley & Sons, Ltd.

Mercury bioaccumulation in dragonflies (Odonata: Anisoptera): Examination of life stages and body regions

Dragonflies (Odonata: Anisoptera) are an important component of both aquatic and terrestrial food webs and are vectors for methylmercury (MeHg) biomagnification. Variations in mercury content with life stage and body regions may affect the relative transfer of mercury to aquatic or terrestrial food webs; however, there has been little research on this subject. Also, little is known about ...

May 31, 2014

By John Wiley & Sons, Ltd.

Acute embryotoxic effects but no long term reproductive effects of in ovo methylmercury exposure in zebra finches (Taeniopygia guttata)

Mercury bioaccumulates in terrestrial ecosystems as methylmercury (MeHg), yet little is known about its effects on terrestrial organisms including songbirds. Here we used a model songbird species, the zebra finch (Taeniopygia guttata), to assess short‐term embryotoxic effects of in ovo MeHg exposure on hatching success and post‐hatching growth and nestling survival, as well as longer‐term ...

Nov. 17, 2015

By John Wiley & Sons, Ltd.

Cadmium regarded as the most serious contaminant of the modern age

Abstract Cadmium is today regarded as the most serious contaminant of the modern age. It is absorbed by many plants and seacreatures and, because of its toxicity, presents a major problem for foodstuffs. Contamination through fertilisers becomes an increasing problem. Unlike lead, cadmium contamination cannot be removed from plants by washing them; it is distributed throughout the organism. It ...

Jan. 2, 2008

By Valahia University

Patterns of Mercury Deposition and Concentration in Northeastern North America (1996–2002)

Data from 13 National Atmospheric Deposition Program Mercury Monitor Network (NADP/MDN) monitoring stations (1996–2002) and the Underhill (VT) event-based monitoring site (1993–2002) were evaluated for spatial and temporal trends. More precipitation and mercury deposition occurred in the southern and coastal MDN sites, except for the Underhill site, which received more mercury deposition than ...

Mar. 1, 2005

By Springer-Verlag GmbH

Cross‐basin comparison of mercury bioaccumulation in lake Huron lake trout emphasizes ecological characteristics

Understanding factors influencing mercury (Hg) bioaccumulation in fish is important for examining both ecosystem and human health. However, little is known of how differing ecosystem and biological characteristics can drive Hg bioaccumulation in top predators. This study compared and contrasted Hg bioaccumulation in multiple age classes of lake trout (Salvelinus namaycush) collected from ...

Nov. 17, 2014

By John Wiley & Sons, Ltd.

Influence of a chlor‐alkali Superfund site on mercury bioaccumulation in periphyton and Low‐trophic level fauna

In Berlin, NH, the Androscoggin River flows adjacent to a former chlor‐alkali facility that is a US EPA Superfund site and source of mercury (Hg) to the river. A study was conducted to determine the fate and bioaccumulation of methylmercury (MeHg) to lower trophic‐level taxa in the river. Surface sediment directly adjacent to the source showed significantly elevated MeHg (10–40x increase, ...

Mar. 2, 2015

By John Wiley & Sons, Ltd.

Response of fish tissue mercury in a freshwater lake to local, regional, and global changes in mercury emissions

A suite of mechanistic atmospheric and mercury cycling/bioaccumulation models is applied to simulate atmospheric mercury deposition and mercury concentrations in the water column and fish in a mercury‐impaired freshwater lake located in the northeastern United States that receives its mercury loading primarily through deposition. Two future‐year scenarios evaluate the long‐term response of ...

Mar. 21, 2014

By John Wiley & Sons, Ltd.

Trophic Structure and Bioaccumulation of Mercury in Fish of Three Natural Lakes of the Brazilian Amazon

The bioaccumulation of mercury by fish was studied in three natural lakes lining the Tapajós River, Brazilian Amazon. The Hg content variations are also reported between the rainy and the rising water seasons. Position of fish in the food chain and the source of carbon at the base of the food chain were determined using nitrogen and carbon stable isotopes ratios respectively. During the two ...

Jul. 1, 2005

By Springer-Verlag GmbH

Managing multimedia pollution for a multimedia world

Due to climate-change-induced melting of essential sea ice habitat and a lack of effective regulatory mechanisms to mitigate further losses, the U.S. Fish and Wildlife Service is now considering the polar bear for listing as a threatened species. If we could place ourselves for a moment in one potential future of the polar bear, similarly stranded in the Arctic Ocean on the last tenuous piece of ...

Dec. 1, 2007

By Air & Waste Management Association (A&WMA)

Biological and chemical influences on trace metal toxicity and bioaccumulation in the marine and estuarine environment

For several trace metals, bioavailability and toxicity are controlled by both chemical (free ion) and physiological effects. The role of salinity in trace metal uptake (particularly cadmium) could be explained by a mixture of free ion and biological effects. Mercury (Hg) and methylmercury (MMHg) bioaccumulation is different from that of other metals because uptake of the free metal ion via ...

Jan. 26, 2004

By Inderscience Publishers

Bioaccumulation and biomagnification of mercury and selenium in the Sarasota Bay ecosystem (USA)

The bioaccumulation and biomagnification of Hg and Se were investigated in Sarasota Bay, FL, USA, in order to characterize the Hg exposure risks to wild bottlenose dolphins in the Bay. The concentrations of total mercury (THg), monomethylmercury (MMHg) and total selenium (TSe) were monitored in the bay, the latter which might reduce mercury (Hg) toxicity. The foodweb structure and dolphin's ...

Feb. 11, 2013

By John Wiley & Sons, Ltd.

Mercury in fish: a critical examination of gold mining and human contamination in Ghana

This study examines the knowledge of miners, fishermen, fish sellers, and fish buyers regarding the linkages between elemental mercury, methylmercury, fish consumption, and health risks in and around mining areas in Ghana. While findings suggest that a clear grasp of the impacts of mercury on human health is lacking, few potentially polluted fish are consumed in the mining areas. Most customers ...

May 17, 2010

By Inderscience Publishers

Analysis of potential mercury policies: The impact of stream basin characteristics on susceptible populations

Human exposure to mercury through fish consumption from local waterways is an ongoing concern to regulatory decision makers. Previously described population exposure and bioaccumulation models were combined in order to analyze the impact of potential policies on susceptible populations. The combined model simulated the problem of mercury exposure by examining the system from the point of ...

Aug. 24, 2012

By John Wiley & Sons, Ltd.

Embryotoxicity of maternally‐transferred methylmercury to fathead minnows (Pimephales promelas)

Mercury is a ubiquitous environmental contaminant and potent neurotoxin. In aquatic environments, mercury can be transformed into methylmercury (MeHg), which bioaccumulates in aquatic food webs, including fish. MeHg has been shown to transfer from female fish to developing eggs; however, relatively little is known regarding effects of maternally‐transferred MeHg on fish embryos. Here, we ...

Oct. 16, 2015

By John Wiley & Sons, Ltd.

Environmental mercury in China: A review

As a global pollutant, mercury can be transported over long distances and bioaccumulate. China is currently the greatest contributor to atmospheric Hg emissions and has the greatest intentional use of Hg. Mercuryin the Chinese environment is generally elevated, particularly in air and water bodies. Remote areas in China also show elevated Hg levels in air and water bodies compared with other ...

Aug. 10, 2012

By John Wiley & Sons, Ltd.

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