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This is a brief
review of the history of the relationship between sea otters and humans.
Leading sea otter experts from the National Biological
Service, James L. Bodkin, Ronald J. Jameson, and James A. Estes offer
their thoughts on potential sources of conflict between sea otters and
humans.
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Start
of fur trade
The web
site for the United States Library of Congress documents the history
of the sea otter fur trade with the Russian colonization of Alaska
during the late 1700s. Native Alaskan tribes had been hunting sea
otters for food and their pelt for many generations. However, the
start of the international sea otter fur trade that eventually led
to its near extinction is accredited to a Danish sea captain, Vitus
Bering, of the Russian Navy.
Vitus
Bering returned to Russia from his second expedition to Kamchatka
in 1741-42 with sea otter pelts for barter. The pelts were soft
and provided incredible warmth. This quickly became the dominant
economy of Alaska for more than 150 years. Initially, Russian frontier
merchants indentured native Aleut hunters to procure furs for them.
In time, larger Russian joint-stock companies, like the Russian-American
Company, replaced the individual trappers and traders. China eventually
grew to be the key market with Russian, British, and American trading
ships bringing their trade directly to Chinese ports. The upper
classes sought the luxurious pelts for their clothing. By the end
of the fur trade in 1911, almost 1 million sea otters had been slaughted,
and the population worldwide had dwindled from 300,000 to about
1,000.
Go to
the Library of Congress web site to learn more about the Russian
and American history in Alaska.
(alaska.fws.gov/mmm/otter/history.html;
memory.loc.gov/intldl/mtfhtml/mfak/mfaktour.html)
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What
is so special about sea otter fur?
Unlike
other marine mammals, sea otters to do not have a thick layer of
fat to keep them warm. Instead, they rely on very dense fur with
an insulating underfur and a layer of long guard hairs over the
top that trap a layer of air, adding further to the insulation.
The fur can be as dense as 1,000,000 hairs per square inch! There
are 100,000 hairs on the entire human head. It was the demand for
this warm and luxurious fur, among the finest in the world, that
led to their near extinction.
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When
and how did the fur trade end?
In 1911,
the U.S., Russia, Japan, and Great Britain signed the International
Fur Seal Treaty, which outlawed the sale of sea otter fur. The U.S.
Marine Mammal Protection Act in 1972 and Endangered Species Act
in 1977 also helped to further protect the sea otters.
In order
to not exclude indigenous culture and customs, Native Alaskans are
allowed to hunt and use sea otter parts as long as these practices
are consistent with their traditional customs. They are not allowed
to sell or give sea otter pelts to any person that is not a Native
Alaskan by blood. There are many other extensive restrictions and
regulations regarding these allowances.
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Sea
otter RECOVERY!
Of
the 13 isolated sea otter populations that survived the fur
trade, 11 grew and re-colonized their original habitats. Each
surviving population in California, south-central Alaska,
and the Aleutian, Medney, and Kuril Islands likely numbered
less than a few hundred animals. More than 100,000 sea otters
occur throughout about 75% of their original range.
Availability
of unoccupied habitat has led to population growth rates of
17 to 20% per year since 1911. This growth rate has been observed
in all persisting populations as long as resources continued
to be available. Migrating populations have resulted in near
complete occupation of the Aleutian and Kuril archipelagos
and the Alaska Peninsula. And growth is expected to continue,
especially in Washington, southeast Alaska, and along the
Kamchatka Peninsula.
(biology.usgs.gov/s+t/noframe/s043.htm)
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Thoughts
from the experts |
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Legal
and illegal harvest for sea otter fur. Communication with
scientists from the Russian Academy of Sciences reveal that
legal harvest of sea otters by Native Alaskans and illegal
harvest in Russia have increased recently.
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Competition
with fishing fleets.
Sea otters primarily feed on sea urchins, but also eat clams,
crabs, and abalone. Meanwhile, there is human harvest of these
same species for commercial, recreational, and subsistence purposes.
As sea otter populations continue to reoccupy their former habitats,
they compete with humans for shellfish. Overharvesting shellfish
resources can have negative implications for humans and sea
otters. |
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This web
site was created by Lynn Tran at the North Carolina State University, Department
of Mathematics, Science, and Technology Education on 7/12/03. Faculty advisor
Dr. David Eggleston, NCSU, Department of Marine, Earth, & Atmospheric Sciences.
Last updated
December 29, 2003
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