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SPECIES AT RISK

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Title: SPECIES AT RISK


1
SPECIES AT RISK PAGE 11 In Canada, species
are given one of five levels based on how much at
risk they are.
2
  • Extinct 12 in Canada

Any species that no longer exists anywhere on
earth.
3
2. Extirpated 21 in Canada
Any species that no longer exists anywhere in
Canada.
4
3. Endangered 141 in Canada
Any species close to extinction in all, or part,
of Canada.
5
4. Threatened 99 in Canada
Any species likely to become endangered, if
things dont change.
6
  • Vulnerable (Special Concern)
  • 142 in Canada

Any species that is at risk due to low or
declining numbers.
7
FACTORS INFLUENCING STATUS
8
  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
9
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
10
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.
11
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.
12
e. Range - Individual
A larger individual range puts the species at
greater risk as they roam to find food, mate, etc.
13
f. Human Interactions
Some animals do well around people and some do
not.
Killed from fear
by cars.
Some avoid humans
Some are poisoned.
14
FOLLOW-UP ASSIGNMENT Now lets try to put some
of this knowledge into practice. turn to chart
on next page
15
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
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