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Pacific walruses studied as sea ice melts

Date:
August 25, 2011
Source:
U.S. Geological Survey
Summary:
U.S. Geological Survey Alaska Science Center researchers, in cooperation with the Native Village of Point Lay, will attempt to attach 35 satellite radio-tags to walruses on the northwestern Alaska coast in August as part of their ongoing study of how the Pacific walrus are responding to reduced sea ice conditions in late summer and fall.
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Walruses resting on an ice floe in the Chukchi sea.
Credit: USGS

USGS Alaska Science Center researchers, in cooperation with the Native Village of Point Lay, will attempt to attach 35 satellite radio-tags to walruses on the northwestern Alaska coast in August as part of their ongoing study of how the Pacific walrus are responding to reduced sea ice conditions in late summer and fall.

Walruses spend most of their lives at sea, but haul out on sea ice and sometimes land to rest between feeding bouts. They can dive hundreds of feet to forage on the sea floor. However, when the sea ice recedes past the continental shelf into very deep waters of the Arctic Basin, the walruses haul out on land. The extent of sea ice has been less in recent summers, and walruses have been hauling out on beaches in Alaska and Russia in the past few years. Thus, radio-tracking the walruses' movements in water and to and from land provides important insights into walrus movements and foraging behaviors in response to changing sea ice conditions.

Since 2004, the USGS Alaska Science Center Pacific Walrus Research Program has collected data on walrus foraging behavior and movements throughout areas of the Bering and Chukchi seas during periods when sea ice is present and when sea ice is absent over the continental shelf. In 2010, walruses came ashore in late August. This year, the sea ice disappeared from the shelf earlier and walruses have already begun to come ashore.

"Sea ice is an important component in the life cycle of walruses," said Chad Jay, research ecologist with the USGS Alaska Science Center. "These tracking studies will help us to better understand how top consumers in the arctic ecosystem may be affected by changes in sea ice habitats."

In July, the scientists attached 40 radio tags on walruses hauled out on distant offshore sea ice near the edge of the continental shelf, northwest of Barrow, Alaska. This month researchers will tag a number of walruses that have come to land after the retreat of the sea ice from the shelf. Tracking animations from tagged walruses are available online (http://alaska.usgs.gov/science/biology/walrus/index.html) and are updated approximately every week.


Story Source:

The above story is based on materials provided by U.S. Geological Survey. Note: Materials may be edited for content and length.


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U.S. Geological Survey. "Pacific walruses studied as sea ice melts." ScienceDaily. ScienceDaily, 25 August 2011. <www.sciencedaily.com/releases/2011/08/110824134403.htm>.
U.S. Geological Survey. (2011, August 25). Pacific walruses studied as sea ice melts. ScienceDaily. Retrieved May 29, 2015 from www.sciencedaily.com/releases/2011/08/110824134403.htm
U.S. Geological Survey. "Pacific walruses studied as sea ice melts." ScienceDaily. www.sciencedaily.com/releases/2011/08/110824134403.htm (accessed May 29, 2015).

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