ScienceDaily (Oct. 14, 2011) — Industrial chemicals are being transported from the industrialized world to the Arctic via air and sea currents. Here, the cocktail of environmental toxins is absorbed by the sea's food chains, of which the polar bear is the top predator.
The accumulated industrial chemicals cause diseases in the polar bears which do not lead to their immediate deaths. On the other hand, the toxins damage the bones and organs of the polar bears, their immune systems and not least their reproductive systems. However, the harm suffered by the population of polar bears in eastern Greenland is not yet fully understood," says Christian Sonne.
Together with researchers from LIFE -- the Faculty of Life Sciences and Aarhus University, Christian Sonne has undertaken the first meta study of ten years of research conducted up until 2010 into the effects of contaminants on the health of the species. At the same time, he has analysed tissue and bone samples from about 100 east Greenlandic polar bears.
Christian Sonne and his colleagues from LIFE -- the Faculty of Life Sciences have previously conducted controlled experiments on the effects of environmental toxins on Arctic foxes and Greenlandic sled dogs. Both species top the Arctic food chain and are genetically and developmentally closely related to the polar bear.
The experiments showed that the damage seen in the polar bears was also evident in the groups of Arctic foxes and dogs which were fed environmental toxins, but not in the control groups.
The title of Christian Sonne's doctoral thesis is: 'Health effects from long-range transported contaminants in Arctic top predators: An integrated review based on studies of polar bears and relevant model species'.
http://www.sciencedaily.com/releases/2011/10/111013121709.htm
Showing posts with label polar bears. Show all posts
Showing posts with label polar bears. Show all posts
Sunday, October 16, 2011
Saturday, November 27, 2010
Alaska polar bears given 'critical habitat'
The US has designated a "critical habitat" for polar bears living on Alaska's disappearing sea ice.
The area - twice the size of the United Kingdom - has been set aside to help stave off the danger of extinction, the US Fish and Wildlife Service said.
The territory includes locations where oil and gas companies want to drill.
Environmentalists hope the designation will make it more difficult for companies to get permits to operate in the region.
"This critical habitat designation enables us to work with federal partners to ensure their actions within its boundaries do not harm polar bear populations," said Tom Strickland, assistant secretary for fish and wildlife and parks.
Any proposed economic activity in the area, which covers 187,000 sq miles (almost 500,000 sq km) must now be weighed against its impact on the polar bear population, Mr Strickland said in a statement.
Most of the designated habitat is sea ice and includes some of the Chukchi and Beaufort seas, where the oil company Shell wants to drill.
Shell was due to start drilling in the Arctic earlier this year, until the BP oil spill in the Gulf of Mexico brought the plans to a temporary halt. It is now aiming to start drilling in 2011.
Environmentalists welcomed the move.
"Now we need the Obama administration to actually make it mean something so we can write the bear's recovery plan - not its obituary," said Kassie Siegel from the Center for Biological Diversity.
Ms Siegel urged the US government to impose a moratorium on oil and gas drilling in bear habitat areas.
Environmentalists also want the polar bear to be listed as an endangered species. Currently the US interior department describes them as "threatened" or likely to become endangered because the sea ice on which they live and hunt is melting.
http://www.bbc.co.uk/news/world-us-canada-11836156
The area - twice the size of the United Kingdom - has been set aside to help stave off the danger of extinction, the US Fish and Wildlife Service said.
The territory includes locations where oil and gas companies want to drill.
Environmentalists hope the designation will make it more difficult for companies to get permits to operate in the region.
"This critical habitat designation enables us to work with federal partners to ensure their actions within its boundaries do not harm polar bear populations," said Tom Strickland, assistant secretary for fish and wildlife and parks.
Any proposed economic activity in the area, which covers 187,000 sq miles (almost 500,000 sq km) must now be weighed against its impact on the polar bear population, Mr Strickland said in a statement.
Most of the designated habitat is sea ice and includes some of the Chukchi and Beaufort seas, where the oil company Shell wants to drill.
Shell was due to start drilling in the Arctic earlier this year, until the BP oil spill in the Gulf of Mexico brought the plans to a temporary halt. It is now aiming to start drilling in 2011.
Environmentalists welcomed the move.
"Now we need the Obama administration to actually make it mean something so we can write the bear's recovery plan - not its obituary," said Kassie Siegel from the Center for Biological Diversity.
Ms Siegel urged the US government to impose a moratorium on oil and gas drilling in bear habitat areas.
Environmentalists also want the polar bear to be listed as an endangered species. Currently the US interior department describes them as "threatened" or likely to become endangered because the sea ice on which they live and hunt is melting.
http://www.bbc.co.uk/news/world-us-canada-11836156
Alaska polar bears given 'critical habitat'
The US has designated a "critical habitat" for polar bears living on Alaska's disappearing sea ice.
The area - twice the size of the United Kingdom - has been set aside to help stave off the danger of extinction, the US Fish and Wildlife Service said.
The territory includes locations where oil and gas companies want to drill.
Environmentalists hope the designation will make it more difficult for companies to get permits to operate in the region.
"This critical habitat designation enables us to work with federal partners to ensure their actions within its boundaries do not harm polar bear populations," said Tom Strickland, assistant secretary for fish and wildlife and parks.
Any proposed economic activity in the area, which covers 187,000 sq miles (almost 500,000 sq km) must now be weighed against its impact on the polar bear population, Mr Strickland said in a statement.
Most of the designated habitat is sea ice and includes some of the Chukchi and Beaufort seas, where the oil company Shell wants to drill.
Shell was due to start drilling in the Arctic earlier this year, until the BP oil spill in the Gulf of Mexico brought the plans to a temporary halt. It is now aiming to start drilling in 2011.
Environmentalists welcomed the move.
"Now we need the Obama administration to actually make it mean something so we can write the bear's recovery plan - not its obituary," said Kassie Siegel from the Center for Biological Diversity.
Ms Siegel urged the US government to impose a moratorium on oil and gas drilling in bear habitat areas.
Environmentalists also want the polar bear to be listed as an endangered species. Currently the US interior department describes them as "threatened" or likely to become endangered because the sea ice on which they live and hunt is melting.
http://www.bbc.co.uk/news/world-us-canada-11836156
The area - twice the size of the United Kingdom - has been set aside to help stave off the danger of extinction, the US Fish and Wildlife Service said.
The territory includes locations where oil and gas companies want to drill.
Environmentalists hope the designation will make it more difficult for companies to get permits to operate in the region.
"This critical habitat designation enables us to work with federal partners to ensure their actions within its boundaries do not harm polar bear populations," said Tom Strickland, assistant secretary for fish and wildlife and parks.
Any proposed economic activity in the area, which covers 187,000 sq miles (almost 500,000 sq km) must now be weighed against its impact on the polar bear population, Mr Strickland said in a statement.
Most of the designated habitat is sea ice and includes some of the Chukchi and Beaufort seas, where the oil company Shell wants to drill.
Shell was due to start drilling in the Arctic earlier this year, until the BP oil spill in the Gulf of Mexico brought the plans to a temporary halt. It is now aiming to start drilling in 2011.
Environmentalists welcomed the move.
"Now we need the Obama administration to actually make it mean something so we can write the bear's recovery plan - not its obituary," said Kassie Siegel from the Center for Biological Diversity.
Ms Siegel urged the US government to impose a moratorium on oil and gas drilling in bear habitat areas.
Environmentalists also want the polar bear to be listed as an endangered species. Currently the US interior department describes them as "threatened" or likely to become endangered because the sea ice on which they live and hunt is melting.
http://www.bbc.co.uk/news/world-us-canada-11836156
Subscribe to:
Posts (Atom)