Navigation Links
International team shows mercury concentrations in fish respond quickly to increased deposition
Date:9/17/2007

A joint Canadian-American research team have, for the first time, demonstrated that mercury concentrations in fish respond directly to changes in atmospheric deposition of the chemical. The international teams research began in 2001 at the Experimental Lakes in Northern Ontario and is featured in this weeks Proceedings of the National Academy of Sciences.

Up to now a direct link has been difficult to establish because of all the other factors that affect mercury levels in fish and large pools of mercury already in the environment, said lead author Reed Harris of Tetra Tech. By adding stable mercury isotopes to an entire ecosystem for several years, our team was able to zero in on the effects of changing atmospheric mercury deposition.

The results were very dramatic, said co-author Dr. Andrew Heyes of the University of Maryland Center for Environmental Science Chesapeake Biological Laboratory. Using the stable isotope approach has revealed a great deal about the cycling of mercury in watersheds. We look forward to continuing our study to provide guidance in mitigating the legacy left by the years of high mercury deposition.

To directly test the response of fish contamination to changing mercury deposition, researchers conducted a whole-ecosystem experiment, increasing the mercury load to a lake and its watershed by the addition of enriched stable mercury isotopes. The isotopes allowed the team to distinguish between experimentally applied mercury and mercury already present in the ecosystem and to examine bioaccumulation of mercury deposited to different parts of the watershed. Fish methylmercury concentrations responded rapidly to changes in mercury deposition over the first three years of study.

This is good news. It means that a reduction in new mercury loads to many lakes should result in lower mercury in fish within a few years, added Cynthia Gilmour of the Smithsonian Environmental Research Center and University of Maryland MEES participating faculty. Harris went on to say The study shows the clear benefits of regulating mercury emissions, and the near-term effectiveness of emission reductions.

Mercury levels in the environment have increased several-fold on a global scale since pre-industrial times due to emissions from coal-fired power plants, metal smelting, and other sources. Mercury is persistent in the environment, and toxic to humans and wildlife. There are currently thousands of advisories against eating fish from lakes in both Canada and the United States.


'/>"/>

Contact: Christopher Conner
cconner@umces.edu
443-496-0095
University of Maryland Center for Environmental Science
Source:Eurekalert

Related biology news :

1. International trial of two microbicides begins
2. International HapMap consortium expands mapping effort
3. Solutions that reduce death of marine life reeled in by International Smart Gear Competition
4. Canadian youth 4th highest in international obesity study
5. International Team Determines Geographic Origin of Leprosy
6. Team of international scientists departs today to discover the unknown in Chinas Himalayan region
7. Tropical dry forests receive international recognition
8. Open Source Biotechnology alliance for international agriculture
9. International HIV/AIDS trial finds continuous antiretroviral therapy superior to episodic therapy
10. Five surprising facts about starvation that could change the international agenda
11. CHAVI announces international search for genes affecting HIV response
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/8/2017)... AWRE ), a leading supplier of biometrics software ... year ended December 31, 2016. Revenue for ... $6.9 million in the same quarter last year. Operating income ... to $2.6 million in the fourth quarter of 2015. Net ... or $0.02 per diluted share, which compares to $1.8 million, ...
(Date:2/7/2017)... -- Zimmer Biomet Holdings, Inc. (NYSE and SIX: ZBH), ... the LEERINK Partners 6th Annual Global Healthcare Conference at ... 15, 2017 at 10 a.m. Eastern Time. ... accessed at http://wsw.com/webcast/leerink28/zbh .  The webcast will be ... Investor Relations website at http://investor.zimmerbiomet.com . ...
(Date:2/2/2017)... , Feb. 2, 2017   TapImmune, Inc. ... immuno-oncology company specializing in the development of innovative ... treatment of cancer and metastatic disease, announced today ... GMP manufacturing of a second clinical lot of ... folate receptor alpha. The manufactured vaccine product will ...
Breaking Biology News(10 mins):
(Date:2/20/2017)... , Feb. 20, 2017  Atrius Health and ... entered into an agreement to develop a cloud ... By providing a holistic view of the multiple ... Watson Cognitive Insights could be designed to support ... Health is an innovative nonprofit healthcare organization with ...
(Date:2/18/2017)... Feb 17, 2017 Research and Markets has ... Report" report to their offering. ... The report provides separate comprehensive analytics for ... , and Rest of World. Annual estimates and forecasts are provided ... is provided for these markets. Market data and analytics are derived ...
(Date:2/17/2017)...  Protagonist Therapeutics, Inc. (NASDAQ: PTGX) today presented ... drug candidates, PTG-100 and PTG-200, at the 12 ... Colitis Organization (ECCO).  The ECCO congress is being ... from February 15 – 18, 2017. ... drug candidates PTG-100 and PTG-200. PTG-100, a potential ...
(Date:2/16/2017)... , Feb. 16, 2017  MDNA Life Sciences ... development of liquid biopsy tests based on the ... an exclusive license agreement with its first international ... liquid biopsy test for prostate cancer, the Prostate ... . This is the first overseas appointment ...
Breaking Biology Technology: