Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Species at Risk Extinct
Document related concepts
Conservation biology wikipedia , lookup
Occupancy–abundance relationship wikipedia , lookup
Unified neutral theory of biodiversity wikipedia , lookup
Introduced species wikipedia , lookup
Island restoration wikipedia , lookup
Theoretical ecology wikipedia , lookup
Overexploitation wikipedia , lookup
Biodiversity wikipedia , lookup
Latitudinal gradients in species diversity wikipedia , lookup
Habitat conservation wikipedia , lookup
Transcript
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.
