presence of ulcerative skin lesions might be associated with a suspected disease agent which appears to be affecting other seal species in the region - radiation investigated as cause
Walrus on Togiak National Wildife Refuge
Photo Credit: Bill Hickey/USFWS
see also:
• whats up: update on diseased seals: Preliminary Assessment of Radionuclide Exposure (Feb 17)
No radiation levels were found in these samples that would directly cause the symptoms seen in the pinnipeds. Test results show radiation levels are within the typical background range for Alaska.• what next: UPDATE re: Deaths of ringed seals in Alaska (Jan 21)
- note: this is regarding direct causation - i am still wondering whether Fukushima's radioactive plume could be affecting the seals, walruses and possibly whales. i have heard no news on the whale deaths beyond that a determination was made that it was not caused by human activity (?)
• more background at what next: Deaths of ringed seals in Alaska | Fukushima | Fish Eaters | Nanuuq's Prey: Ice Seals (Jan 17)
In August 2011 a large herd of Pacific walruses (Odobenus rosmarus divergens) hauled out onto a barrier island near the coastal community of Point Lay, Alaska. Some of the walruses at the haulout site were reported to have bleeding skin lesions, and a ground-based survey confirmed the presence of ulcerative skin lesions on several walrus carcasses and some of the live animals.
Alaska Marine Science Symposium poster (January 2012)The cause(s) and significance of the skin lesions are currently unknown. Most walruses exhibiting skin lesions appeared to be otherwise healthy. One hypothesis under investigation is that the skin lesions observed in walruses at the Point Lay site might be associated with a suspected disease agent which appears to be affecting other seal species in the region.
In December 2011 the Working Group on Marine Mammal Unusual Mortality Events (WGMMUME) determined that an “Unusual Mortality Event” (UME) involving multiple species of pinnipeds is occurring in the Arctic. A UME is defined as: "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response..."
...The primary species involved in the mortality event has been ringed seals (Phoca hispida); however other species of arctic pinnipeds, including walrus have exhibited similar symptoms. As part of the UME investigation process, The U.S. Fish and Wildlife Service will be working with the WGMMUME and an Inter-agency response team to investigate factors contributing to the observed symptoms.
more > Alaska Region - Marine Mammals Management
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whats up: update on diseased seals: Preliminary Assessment of Radionuclide Exposure (Feb 17)
Summary of findings: Scientists have conducted preliminary qualitative screening of a few tissue samples from both healthy and sick pinnipeds (ice seals and walruses) involved in this UME for possible radionuclide exposure. No radiation levels were found in these samples that would directly cause the symptoms seen in the pinnipeds. Test results show radiation levels are within the typical background range for Alaska.
what next: UPDATE re: Deaths of ringed seals in Alaska (Jan 21)
what next: Deaths of ringed seals in Alaska | Fukushima | Fish Eaters | Nanuuq's Prey: Ice Seals (Jan 17)
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