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Mercury Levels In Arctic Seals May Be Linked To Global Warming

Date:
May 5, 2009
Source:
American Chemical Society
Summary:
Researchers in Canada are reporting for the first time that high mercury levels in certain Arctic seals appear to be linked to vanishing sea ice caused by global warming. Their study provides new insight into the impact of climate change on Arctic marine life.

Researchers are reporting that high mercury levels in Arctic seals appear to be linked to vanishing sea ice caused by global warming.
Credit: NOAA

Researchers in Canada are reporting for the first time that high mercury levels in certain Arctic seals appear to be linked to vanishing sea ice caused by global warming. Their study provides new insight into the impact of climate change on Arctic marine life.

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Gary Stern and colleagues note in the new study that Canadian Arctic ringed seals, like many Arctic marine animals, have relatively high levels of mercury. However, researchers have never determined how these levels are linked to sea ice extent and the resulting composition of arctic cod and other prey containing mercury available to ringed seals.

The scientists analyzed the mercury content in muscle samples collected from ringed seals between 1973 and 2007. They then compared the levels to the length of the so-called "summer ice-free season," a warm period marked by vanishing sea ice in the seals' habitat. They found that the seals accumulated more mercury during both short (2 months) and long (5 months) ice-free seasons and postulate that this is related to the seals' food supplies.

Higher seal mercury concentrations may follow relatively short ice-free seasons due to consumption of older, more highly contaminated Arctic cod while relatively long ice-free seasons may promote higher pelagic productivity and thus increased survival and abundance of Arctic cod with the overall result of more fish consumption and greater exposure to mercury. Longer ice-free seasons resulting from a warming Arctic may therefore result in higher mercury levels in ringed seal populations as well as their predators (polar bears and humans).


Story Source:

The above story is based on materials provided by American Chemical Society. Note: Materials may be edited for content and length.


Journal Reference:

  1. Gaden et al. Mercury Trends in Ringed Seals (Phoca hispida) from the Western Canadian Arctic since 1973: Associations with Length of Ice-Free Season. Environmental Science & Technology, 2009; 090323151940053 DOI: 10.1021/es803293z

Cite This Page:

American Chemical Society. "Mercury Levels In Arctic Seals May Be Linked To Global Warming." ScienceDaily. ScienceDaily, 5 May 2009. <www.sciencedaily.com/releases/2009/05/090504165950.htm>.
American Chemical Society. (2009, May 5). Mercury Levels In Arctic Seals May Be Linked To Global Warming. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2009/05/090504165950.htm
American Chemical Society. "Mercury Levels In Arctic Seals May Be Linked To Global Warming." ScienceDaily. www.sciencedaily.com/releases/2009/05/090504165950.htm (accessed October 24, 2014).

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