SPECIES AT RISK

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SPECIES AT RISK PAGE 11 In Canada, species
are given one of five levels based on how much at
risk they are.
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• Extinct 12 in Canada

Any species that no longer exists anywhere on
earth.
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2. Extirpated 21 in Canada
Any species that no longer exists anywhere in
Canada.
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3. Endangered 141 in Canada
Any species close to extinction in all, or part,
of Canada.
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4. Threatened 99 in Canada
Any species likely to become endangered, if
things dont change.
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• Vulnerable (Special Concern)
• 142 in Canada

Any species that is at risk due to low or
declining numbers.
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FACTORS INFLUENCING STATUS
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1. Size

Larger animals need more food more space.
Both eat a similar diet, BUT one
eats much more so needs to move more to find
more food
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b. Diet
A carnivore is at greater risk because its food
may become rare more readily than a herbivores
food will become rare.
Also, a specific diet is riskier than a general
diet.
The frog is at more risk than the shrew as it
eats only crickets
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c. Biotic Potential
Birth rate, survival to reproductive age,
births per year
and births per lifetime are all
part of this.
Mice breed much faster than buffalo.
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d. Range of Species
An animal that has a small species range is at
greater risk as something may happen to that
range..
The species at left has a smaller range and so is
at a greater risk.
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e. Range - Individual
A larger individual range puts the species at
greater risk as they roam to find food, mate, etc.
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f. Human Interactions
Some animals do well around people and some do
not.
Killed from fear
by cars.
Some avoid humans
Some are poisoned.
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FOLLOW-UP ASSIGNMENT Now lets try to put some
of this knowledge into practice. turn to chart
on next page
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A
B
C
D
E
F
small
small
small
large
large
large
size
diet
herbivore
carnivore
carnivore
omnivore
omnivore
herbivore
biotic potential
high
high
low
low
high
low
range -species
large
large
large
small
small
small
range-individual
small
large
small
large
small
large
human interactions
many
few
few
many
many
few
negative traits A 1 B 4 C 4 D 1 ½
E 5 F 2 ½