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Q & A What does it mean for an organism to be endangered ? Do you know of any animals who are endangered?
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Endangered Species
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Classifying Species at Risk Extinct – a species that is no longer found anywhere (i.e. Blue walleye) http://www.brainpop.com/ (extinction) http://www.brainpop.com/
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Another One Bites the Dust … Passenger Pigeon –Let’s meet Martha –Last passenger pigeon- – Died in 1914 in Cincinnati Western Black Rhino Became extinct in 2006 due to over poaching and habitat distruction
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Endangered – A species that is close to extinction in all parts of Canada (giraffes, polar bears etc. ) Eastern Cougar Extinct 2015
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Extirpated – any species that no longer exists in one part of Canada, but can be found in others (i.e. grizzly bear)
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Classifying Species at Risk Threatened – any species that is likely to become endangered if conditions are not reversed (i.e. wood bison) Did you know ? –Almost 200 000 once roamed the north but by the early 1900s their numbers had plummeted to fewer than 300. – ・ Since 1980 has brought their numbers up to approximately 4500 but bovine diseases, brucellosis and tuberculosis remains a major obstacle to further recovery
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Wood Bison
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Vulnerable – any species that is at risk because of low numbers (i.e. grey fox)
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Classwork Page 14-15, #2 Read pages 16-19 #1 - #3
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Activity- Food Chains 3 groups: –18 Grasshoppers –6 Shrews –2 Hawks Grasshoppers hunt for food first Put as much food (plants and flowers) in their stomachs You have 30 seconds to eat without the threat of predators (shrews) You can continue eating once the shrews are hunting
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Shrews- Watch the grasshoppers feed like good predators Try to catch the grasshoppers by tagging them Once you tag a grasshopper, you take their bag of food and the grasshoppers goes to the side. You can tag more than one grasshopper but watch out for hawks! Hawks- Go and hunt some shrews! –Don’t forget to take all their bags of food !
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Food Chain Activity- Back in the Class Uneaten players – Count your total food tickets How many green did you have ? How many pink?
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SURPRISE All the green plants were actually sprayed with a pesticide This pesticide accumulates in food chains All surviving grasshoppers with green tickets = dead All surviving shrews with more than half green tickets= dead Hawks- you don’t die…. But….
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Hawks You have so much pesticide in your body that the egg shells produced during your next mating season will be so thin that they eggs will not hatch successfully. Eggs are also so thin that they break easily. This does not get better as time goes on. Result- ??
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The Bald Eagle In the early 1900’s biologists noticed a decline in their numbers A pesticide, DDT was harming them
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DDT is insoluble in water It is soluble in fats and oils DDT was sprayed to kill mosquitoes – which carry the disease malaria Bald eagles would eat small rodents (mice) that had been exposed to DDT
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This caused them to lay thin shelled eggs As a result the baby eagles would not survive Population numbers dropped DDT has been banned in Canada since the 70’s
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Bioamplification: the movement of a toxin up the food chain (i.e. from plants – carnivores)
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Endangered Species Video Can you list the endangered species from the video? What was causing them to become endangered? What was being done to help them? Was it working?
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Scallops and Sharks What is happening to the sharks? How is this affecting the scallops? Why is this happening? What can be done to prevent it?
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