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Mercury Levels In Arctic Seals May Be Linked To Global Warming - 0 views

www.sciencedaily.com/...090504165950.htm

climate change impact Arctic sea ice Arctic species seals

shared by Hunter Cutting on 14 Jun 10 - Cached
  • high mercury levels in certain Arctic seals appear to be linked to vanishing sea ice caused by global warming.
  • 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).
  • Hunter Cutting on 14 Jun 10
     
    Science Daily
Hunter Cutting

Barnacle goose populations dropping as trapped polar bears hunt goslings - 0 views

news.scotsman.com/...hreatening-geese-as.6370002.jp

climate change impact birds goose barnacle goose polar bear Arctic Svalbard

shared by Hunter Cutting on 21 Jun 10 - Cached
  • Polar bears threatening geese as diet ravaged by climate shift Premium Article ! Your account has been frozen. For your available options click the below button. Options Premium Article ! To read this article in full you must have registered and have a Premium Content Subscription with the The Scotsman site. Subscribe Registered Article ! To read this article in full you must be registered with the site. Sign In Register « Previous « Previous Next » Next » View Gallery Published Date: 18 June 2010 By Emily Beament A CONSERVATION success which has seen barnacle geese numbers bounce back from the brink could be under threat from hungry polar bears struggling to cope with cl
  • A CONSERVATION success which has seen barnacle geese numbers bounce back from the brink could be under threat from hungry polar bears struggling to cope with climate change, experts said yesterday. The number of Svalbard barnacle goslings that overwintered in the Solway Firth this year was just half that expected, according to the Wildfowl and Wetlands Trust (WWT).
  • on eggs in the nests
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  • The conservation group blames polar bears feasting
  • f the
  • geese in their summer breeding site, around Spitsbergen, Norway.Researchers, who have photographed bears in the nests and found evidence of "egg raids", say more polar bears are gathering around Spitsbergen and preying on the eggs because a reduction in Arctic ice is making it harder for them to hunt seals.
  • Brian Morrell, a zoologist based at the wildlife centre, said: "Our suspicion is that, as climate change reduces the polar ice-floe, making it harder for the bears to hunt their usual diet of seal, they are being driven by hunger to prey on nest sites.
  • "Obviously it takes a very large quantity of eggs to satisfy an animal as big as a polar bear, especially one with cubs."The impact is that entire nesting areas are being stripped bare of eggs and young, with potentially dire consequences for the geese and wildlife tourism."The bears could threaten the fortunes of the Svalbard barnacle geese population; there were just 300 birds in the 1940s, but now up to 30,000 visit Scotland each winter. The turnaround was the result of a ban on hunting, work on monitoring and the provision of a safe habitat for the geese at Caerlaverock, the WWT said.
  • Trust chief executive Martin Spray said: "It is a tragedy to witness two species of conservation concern clashing over the right to survive, and demonstrates the tensions the natural world is experiencing right now."
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