Species at Risk Extinct

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Transcript Species at Risk Extinct

Biodiversity
SNC1D
Biodiversity: the variety of life in a particular ecosystem
Biodiversity: the variety of life in a particular ecosystem
Monoculture: an environment with very low
biodiversity
Monocultures are very vulnerable to ecological
collapse: when all living things in an ecosystem die.
High biodiversity leads to sustainable ecosystems.
High biodiversity leads to sustainable ecosystems.
In part, due to redundancy in the food web.
If the number of
rabbits decreases,
the foxes can still
eat squirrels.
Biodiversity Under Attack
Humans are rapidly destroying Earth's ecosystems and
along with them, many species, some we don't even
yet know exist.
Species at Risk
Extinct: a species that has died out and no longer exists
anywhere on Earth
Species at Risk
Extinct: a species that has died out and no longer exists
anywhere on Earth
Example:
Passenger pigeon
Species at Risk
Extirpated: a species that no longer exists in a specific
area in the wild but still lives elsewhere
Species at Risk
Extirpated: a species that no longer exists in a specific
area in the wild but still lives elsewhere
Example:
Atlantic walrus in
Northwest Atlantic
Species at Risk
Endangered: a species facing imminent extirpation or
extinction
Species at Risk
Endangered: a species facing imminent extirpation or
extinction
Example:
Swift fox
Species at Risk
Threatened: a species that is likely to become
endangered if factors reducing its survival are not
changed
Species at Risk
Threatened: a species that is likely to become
endangered if factors reducing its survival are not
changed
Example:
Humpback whale
Species at Risk
Special Concern: a species that may become
threatened or endangered because of a combination of
factors
Species at Risk
Special Concern: a species that may become
threatened or endangered because of a combination of
factors
Example:
Polar bear
In Canada, the Committee on the Status of Endangered
Wildlife in Canada (COSEWIC) categorizes at-risk
species and the Recovery of Nationally Endangered
Wildlife (RENEW) agency prepares action plans.
Ecosystems can recover from disturbances (natural or
human) and re-establish equilibrium in a process called
succession.
Ecosystems can recover from disturbances (natural or
human) in a process called succession.
Primary succession can even occur on bare rock.