species at risk lesson 6. species whose population decline below a certain level are considered to...
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Species at RiskSpecies at RiskLesson 6
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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 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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ThreatenedThreatenedAny 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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ExtirpatedExtirpatedAny 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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EndangeredEndangeredA 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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ExtinctExtinctA 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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ExtinctionExtinctionEvery 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 ExtinctionCauses of ExtinctionClimate change and competition
from other species are factors contributing to extinction but the major factor is human activities.
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Effects of ExtinctionEffects of ExtinctionSince 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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Why is having a classification system for species at risk important and useful?
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Web SearchWeb SearchPick an animal or a plant, which
is either endangered, extirpated or threatened, and answer the following questions about it by using the internet as a resource tool.
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Questions: Questions: What is the animal?What is its status? (endangered,
extirpated, threatened) K (1)Where does it live? K (1) What is its habitat? K (1) Make a simple food chain or web that it
would be in T (2) Why is the species in danger? K (1) What is being done to protect the
species? T (1) What do you think should be done to
help save the species? T (1) K ( / 4) T ( /4)