Production and loss of methylmercury, and its uptake in lake food webs of the High Arctic

Sediment methylation and demethylation rates were measured by short-term incubations of stable isotopes of inorganic and methylmercury in sediment cores. Methylmercury photodemethylation rates were performed, during which water samples were incubated in the field under different treatments. Some bottles were spiked with methylmercury or complexing agents and scavengers. Labile concentrations of methylmercury were measured in water and sediment using DGT (Diffusive Gradient in Thin Film) samplers. Characterization of the microbial community in sediment and quantification of targeted microbes potentially involved in MeHg cycling were performed using qRT-PCR approaches, cloning and library analyses combined with gel electrophoresis techniques. Methylmercury bioaccumulation at the base of the food web was examined by collecting filamentous benthic algae and chironomid larvae from nearshore and offshore areas in the study lakes.

Basic view

Metadata Record Information

File Identifier
e4230d56-ef05-44fc-a619-c5bb77662ddc XML
Date Stamp
2022-01-13T16:37:46
Metadata language

eng; CAN
Character set
UTF8
Hierarchy Level
Series
Author
  Government of Canada; Environment and Climate Change Canada - Environment and Climate Change Canada ( Public inquiries centre )
Fontaine Building 12th floor, 200 Sacré-Coeur Blvd , Gatineau , Quebec , K1A 0H3 , Canada
1-800-668-6767
http://ec.gc.ca
 

Data identification

Date (Publication)
2013-06-25
Date (Creation)
2013-06-25
Status
Completed
Metadata language

eng; CAN
Character set
UTF8
Topic category
  • Environment
Maintenance and Update Frequency
As needed
Spatial representation type
Vector
Originator
  Government of Canada; Environment and Climate Change Canada - Chételat, John ( Research Scientist )
Canada
Distributor
  Government of Canada; Environment and Climate Change Canada; Canadian Cryospheric Information Network - Polar Data Catalogue ( Manager )
200 University Ave , Waterloo , Ontario , N2L 3G1 , Canada
(519) 888-4567 x32689

Keywords

Place

  • Bylot Island

  • Cornwallis Island
Theme

  • Bacteria

  • Chironomids

  • Sediment methylmercury production

  • Wetlands

  • Lakes

  • Methylmercury

  • Photochemistry

ECCC Information Category EN

  • Nature and Biodiversity - Contaminants

Government of Canada Core Subject Thesaurus

  • Toxicology

Business Functions

  • Assess Toxicity, Manage and Monitor for Environmental Presence of Hazardous Substances and Waste

  • Monitor / Assess Substance and Waste Levels in Air, Water, Soil, Biota

Geography

  • Territories - Nunavut (NU)

external.theme.EC_Branch

  • Science and Technology Branch

external.theme.EC_Directorate

  • Wildlife and Landscape Science

external.theme.GC_Security_Level

  • Unclassified
 
Use Limitation

Open Government Licence - Canada ( http://open.canada.ca/en/open-government-licence-canada )

Access Constraints
License
Use Constraints
License
Begin Date
2010-05-01
End Date
2012-03-31

Extent

N
S
E
W
thumbnail


 
 

Ref. system Reference Systems

Reference system identifier
EPSG / EPSG:4326 /
 

Distribution

Distribution Formats

Distribution format
  • XLS ( XLS )

 
Distributor
  Government of Canada; Environment and Climate Change Canada - Environment and Climate Change Canada ( Public inquiries centre )
Fontaine Building 12th floor, 200 Sacré-Coeur Blvd , Gatineau , Quebec , K1A 0H3 , Canada
1-800-668-6767
http://ec.gc.ca
 
 

Overviews

N
S
E
W
thumbnail


Keywords

Bacteria Bylot Island Chironomids Cornwallis Island Lakes Methylmercury Photochemistry Sediment methylmercury production Wetlands
Business Functions
Assess Toxicity, Manage and Monitor for Environmental Presence of Hazardous Substances and Waste Monitor / Assess Substance and Waste Levels in Air, Water, Soil, Biota
ECCC Information Category EN
Nature and Biodiversity - Contaminants
Government of Canada Core Subject Thesaurus
Toxicology
external.theme.EC_Branch
Science and Technology Branch
external.theme.EC_Directorate
Wildlife and Landscape Science
external.theme.GC_Security_Level
Unclassified

Provided by

Share on social sites

Associated resources

Not available