canada’s endangered species
DESCRIPTION
Canada’s Endangered Species. Bald Eagle. Common in 1700s and 1800s 1900s- decline in population Farmers Toxic chemical waste Health of top-level carnivores indicates whether toxins are entering an ecosystem. COSEWIC. Committee On the Status of Endangered Wildlife In Canada - PowerPoint PPT PresentationTRANSCRIPT
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Bald Eagle
Common in 1700s and 1800s 1900s- decline in population
Farmers Toxic chemical waste
Health of top-level carnivores indicates whether toxins are entering an ecosystem
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COSEWIC Committee On the Status of
Endangered Wildlife In Canada Assesses and designates which wild
species are in danger of disappearing
http://canadianbiodiversity.mcgill.ca/english/species/endangered/extinct.htm
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Classifying Species at Risk Extinct Extirpated Endangered Threatened Special Concern
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Extinct
Species that is no longer found anywhere
Example: Great Auk QC, NB, NS, NL Over-hunting Extinct since 1844
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Extirpated
Species that no longer exists in one area but can be found in others (Locally extinct)
Example: Grizzly Bear No longer found in the
Canadian prairies Hunting and habitat
destruction
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Endangered
Species that is close to extinction in a significantly large location
Example: Beluga Whale Arctic and Atlantic Ocean Over-hunting Habitat Degradation
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Threatened
Any species that is likely to become endangered if things are not reversed
Example: Killer Whale Pacific Ocean Decrease in prey (salmon) Physical and Accoustical
Disturbances Oil spills and contaminants
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Special Concern
Species that are particularly sensitive to human activities or natural events
and could become endangered or threatened Example: Polar Bear
YT, NT, NU, MB, ON, QC, NL, Arctic Ocean
Overharvest Climate Change
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SARA
Species at Risk Act Established in 2003 Purpose is to protect wildlife species
at risk in Canada. Government must legally protect
species designated by COSEWIC.
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Extinction in Modern World Extinction rates are increasing Causes?????
Mostly human activities
Mass extinction occurred before humans Caused by major catastrophes Example: Yucatan Peninsula- Asteroid
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Effects of Extinction Biodiversity- number of species in an
ecosystem
“Domino Effect”- Removal of one part can cause the collapse of the entire food chain.
Example: over-hunting of sea otters Sea urchin population increased led to destruction of kelp beds
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What is our role?Restoring the Balance
Once an ecosystem is damaged, should it be fixed?
Example: Petitcodiac River Example: Wolves of Yellowstone National
Park Example: Peregrine Falcons in NB