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Brown Bear Ecology
As large
carnivores, Alaska brown bears range over great expanses of land, sometimes
as much as 150 square miles for a single bear. In addition, brown bears
depend upon such land features and associated animals and plants as alpine,
slopes, sedge meadows, salmon streams, and old growth forests. These areas
satisfy seasonal needs for feeding, winter denning, raising cubs, and other
survival activities. Thus, while it is important when studying animals to
understand the habitat or particular environment they require to survive, in
studying brown bears it is important to understand an entire complex of
interrelated habitats or what is called a landscape.
Most of us
are familiar with the term ecosystem. The term is used to describe a
community of plants and animals functioning together with their nonliving
environment . An ecosystem, such as a pond, or a forest is a relatively
homogeneous unit, even though it may be very complex. A landscape, on the
other hand, encompasses a combination of ecosystems that are closely related
and intertwined. It is made up of different ecosystems, such as marshes,
meadows, or stream side forests, that function and change in relation to
each other.
Landscapes
are made up of three basic elements
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Background
matrix is the most plentiful of all the elements
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Patches
whose composition differs from that of the matrix
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Corridors, narrow strips of land that differ from the matrix on either
side of them.
For
example, if part of Southeast Alaska were described as a landscape,
temperate rain forest would be the matrix. Soggy peat bogs, estuarine
meadows, avalanche slopes, and a mining camp would be some of the patches.
Salmon spawning streams and an old gravel road to the mine would be two
kinds of corridors.
A habitat is the
place an organism inhabits in fulfilling its life needs; food, shelter, and
water. To be considered a habitat, an area must be large enough to support a
population over a long period of time. For animals such as brown bears,
which require a number of integrally related habitats for their activities,
it is more accurate to describe the "place they inhabit" with the more
expansive term of landscape. Thus, bears are species of landscapes rather
than habitat types.
If an
animal's habitat is its "address." its niche is "the way it makes its
living." The term niche refers to the role an organism plays in an
ecosystem, or how it functions in the world. An organism's niche includes
physical factors such as its food preferences and requirements for shelter
and biological and behavioral factors such as how it acquires its food and
how it relates to other organisms.
The
concept of niches suggests that similar species with different niches are
able to coexist in one ecosystem because they use resources differently.
Brown bears and black bears often coexist in parts of Southeast Alaska
because they use different resources. Black bears feed and raise their young
primarily in forested areas, where they are able to climb trees for
protection from people or other animals that may threaten them. The larger,
more aggressive brown bears forage and raise their young in alpine and more
open areas. Here the brown bears' aggressive nature and larger size serve as
their defense from threats.
Conservation Science Executive Director, Bruce Wright, has worked with bears
in Alaska and had many close encounters. He survived those situations by
carefully following the suggestions provided below. Be safe in bear country
so that both you and bears can live.
You can
read about one bear encounter Bruce had in Alaska's wilderness by clicking
on this link:
Bear Knocks.
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The Essentials for Traveling in Bear Country: Bear Behavior
One of the
things that makes Alaska so special is that all three species of North
American bears flourish here. There is a chance that you may be lucky enough
to see a bear. But even if you don't, you will never be far from one,
because Alaska is bear country.
Brown/grizzly bears are found from the islands of Southeast Alaska to the
arctic. Black bears inhabit most of Alaska's forests. Polar bears frequent
the pack ice and tundra of extreme northern and western Alaska.
Bears are
curious, intelligent, and potentially dangerous animals, but undue fear of
bears can endanger both bears and people. Many bears are killed each year by
people who are afraid of them. Respecting bears and learning proper behavior
in their territory will help so that if you encounter a bear, neither of you
will suffer needlessly from the experience.
Most bears
tend to avoid people. In most cases, if you give a bear the opportunity to
avoid a confrontation, it will. Many bears live in Alaska and many people
enjoy the outdoors, but surprisingly few people even see bears. Only a tiny
percentage of those few are ever threatened by a bear. A study by the state
epidemiologist showed that during the first 85 years of this century only 20
people died in bear attacks in Alaska. In contrast, during the 10 years
1975-85, dogs killed 19 people in Alaska. Most people who see a bear in the
wild consider it the highlight of their trip. The presence of these majestic
creatures is a reminder of how privileged we are to share some of the
country's dwindling wilderness.
Bears Don't Like Surprises!
If you are
hiking through bear country, make your presence known, especially where the
terrain or vegetation makes it hard to see. Make noise, sing, talk loudly,
or tie a bell to your pack. If possible, travel with a group. Groups are
noisier and easier for bears to detect. Avoid thick brush. If you can't, try
to walk with the wind at your back so your scent will warn bears of your
presence. Contrary to popular belief, bears can see almost as well as
people, but they depend upon sense of smell more than their eyes or ears.
Always let bears know you are there. Bears, like humans, use trails and
roads. Don't set up camp close to a trail they might use. Detour around
areas where you see or smell carcasses of fish or animals, or see scavengers
congregated. A bear's food may be there, and if the bear is nearby it may
defend the cache aggressively.
Don't Crowd Bears!
Give bears
plenty of room. Some bears are more tolerant than others, but every bear has
a personal space, the distance within which a bear feels threatened. If you
stray within that zone, a bear may react aggressively. When photographing
bears, use long lenses, getting close for a great shot could put you inside
the danger zone.
Bears Are Always Looking for
Something to Eat.
Bears have
only about six months to build up fat reserves for their long winter
hibernation. Don't let them learn human food or garbage is an easy meal. It
is both foolish and illegal to feed bears, either on purpose or by leaving
food or garbage that attracts them.
Cook away
from your tent. Store all food away from your campsite. Hang food out of
reach of bears if possible. If no trees are available, store your food in
airtight or specially designed bear-proof containers. Remember, pets and
their food may also attract bears. Keep a clean camp. Wash your dishes.
Avoid smelly food like bacon and smoked fish.
Keep food
smells off your clothing. Burn garbage completely in a hot fire and pack out
the remains. Food and garbage are equally attractive to a bear so treat them
with equal care. Burying garbage is a waste of time. Bears have keen noses
and are great diggers.
If a bear
approaches while you are fishing, stop fishing. If you have a fish on your
line, don't let it splash. If that's not possible, cut your line. If a bear
learns it can obtain fish just by approaching fishermen, it will return for
more.
Close Encounters: What to do.
If you see
a bear, avoid it if you can. Give the bear every opportunity to avoid you.
If you do encounter a bear at close distance, remain calm. Attacks are rare.
Chances are you are not in danger. Most bears are interested only in
protecting food, cubs, or their “personal space”. Once the threat is
removed, they will move on.
Remember
the following:
Identify
Yourself.
Let the
bear know you are human. Talk to the bear in a normal voice. Wave
your arms. Help the bear recognize you. If a bear cannot tell what you are,
it may come closer or stand on its hind legs to get a better look or smell.
A standing bear is usually curious, not threatening. You may try to back
away slowly diagonally, but if the bear follows, stop and hold your
ground.
Don't Run!
You can't
outrun a bear. They have been clocked at speeds up to 35 mph, and like dogs,
they will chase fleeing animals. Bears often make bluff charges, sometimes
to within 10 feet of their adversary, without making contact. Continue
waving your arms and talking to the bear. If the bear gets too close, raise
your voice and be more aggressive. Bang pots and pans. Use noisemakers.
Never imitate bear sounds or make a high-pitched squeal.
If Attacked?
If a brown
bear actually makes contact, surrender! Fall to the ground and play dead.
Lie flat on your stomach, or curl up in a ball with your hands behind your
neck. Typically, a brown bear will break off its attack once it feels the
threat has been eliminated. Remain motionless for as long as possible. If
you move, and the bear sees or hears you, it may return and renew its
attack. In rare instances, particularly with black bears, an attacking bear
may perceive a person as food. If the bear continues biting you long after
you assume a defensive posture, it likely is a predatory attack. Fight back
vigorously.
Protection
Firearms
should never be used as an alternative to common-sense approaches to
bear encounters. If you are inexperienced with a firearm in emergency
situations, you are more likely to be injured by a gun than a bear. It is
illegal to carry firearms in some of Alaska's national parks, so check
before you go.
A
.300-Magnum rifle or a 12-gauge shotgun with rifled slugs are appropriate
weapons if you have to shoot a bear. Heavy handguns such as a .44-Magnum may
be inadequate in emergency situations, especially in untrained hands.
State law
allows a bear to be shot in self-defense if you did not provoke the attack
and if there is no alternative. But the hide and skull must be salvaged and
turned over to the authorities. Defensive aerosol sprays which contain
capsicum (red pepper extract) have been used with some success for
protection against bears. These sprays may be effective at a range of 6-8
yards. If discharged upwind or in a vehicle or airplane, they can disable
the user. Take appropriate precautions. If you carry a spray can in the
wilderness, keep it handy and know how to use it.
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Female bears can be fierce defenders of their young.
Getting between a female and her cubs is a serious mistake.
A female bear may respond aggressively to any threat she perceives to
her cubs. |
In
Summary
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Avoid surprising bears
at close distance.
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Look for
signs of bears and make plenty of noise.
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Avoid
crowding bears; respect their “personal space.”
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Avoid
attracting bears through improper handling of food or garbage.
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Plan
ahead, stay calm, identify yourself, don't run.
In
most cases, bears are not a threat, but they do deserve your respect and
attention.
When traveling in bear country, keep alert and enjoy
the opportunity to see these magnificent animals in their natural habitat.
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The
text of this document was excerpted and adapted from a brochure,
Bear Facts, produced by Alaska Department of Fish and Game in
cooperation with other state and federal agencies, and is not
protected by copyrights belonging to the Alaska Department of Fish and
Game. |

Back to the top
For more
information about being safe around bears read:
Safety in Bear Country
Bear Safety
Bear
Attacks, Their Causes and Avoidance,
by Stephen Herrero, Winchester Press. |