Species at Risk

Июль 25, 2022

Содержание

2. Species whose population decline below a certain level are considered to be at risk. In Canada
3. Vulnerable Any species that is at risk because of low or declining numbers at the fringe
4. Threatened Any species that is likely to become endangered if factors that make it vulnerable are
5. Extirpated Any species that no longer exists in one part of Canada, but can be found
6. Endangered A species that is close to extinction in all parts of Canada or in a
7. Extinct A species that is not found anywhere -Blue Walleye (last seen in lake Erie in
8. Extinction Every single year thousands of species become eliminated and the number grows larger each year.
9. Causes of Extinction Climate change and competition from other species are factors contributing to extinction but
10. Effects of Extinction Since all organisms in an ecosystem are connected the extinction of one species
11. Why is having a classification system for species at risk important and useful?
12. Web Search Pick an animal or a plant, which is either endangered, extirpated or threatened, and
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Species whose population decline below a certain level are considered to

be at risk. In Canada there are more than 250 species of plants and animals that are at various degrees of risk

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Vulnerable
Any species that is at risk because of low or

declining numbers at the fringe of its range or in some restricted area
-Atlantic cod (even though commercial fishing has been reduced)
-Grey fox (is beginning to return to Southern Ontario, but it needs woodlands)

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Threatened
Any species that is likely to become endangered if factors that

make it vulnerable are not reversed
-Wood bison (their number is small and a recent sickness is a problem for the remaining population
-Anatum peregrine falcon (with captive breeding the population is slowly recovering)

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Extirpated
Any species that no longer exists in one part of Canada,

but can be found in others.
-Grizzly bear (no longer found in Manitoba and Saskatchewan, but still in Alberta and B.C.
-Sage Grouse, Has not been seen in B.C since 1966

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Endangered
A species that is close to extinction in all parts of

Canada or in a significantly large location
-Eastern cougar (sightings are very rare)
-Beluga whale, (in 1997 there were only 1221 whales in the St. Lawrence)

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Extinct
A species that is not found anywhere
-Blue Walleye (last seen in

lake Erie in 1965
-Passenger pigeon (the last one died in captivity in 1914)

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Extinction
Every single year thousands of species become eliminated and the number

grows larger each year.
Between 1600 and 1900 it is estimated that one species went extinct every 4 years. This number has sky rocketed and is thought to hit 1 species going extinct every 30 minutes.

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Causes of Extinction
Climate change and competition from other species are factors

contributing to extinction but the major factor is human activities.

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Effects of Extinction
Since all organisms in an ecosystem are connected the

extinction of one species can cause a domino effect and lead to the collapse of an entire food chain. This then reduces the biodiversity (variety) of species. Extinction cannot be reversed but it can be prevented.

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