9. Overexploitation of Species

9. Overexploitation of Species - Making Headway in the...

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Making Headway in the Movement to Protect the World’s Sharks. NY TIMES. Elisabeth Rosenthal, Sept 10, 2011 The last 12 months have seen a flurry of laws, regulations and industry actions to end the international trade in the age- old delicacy, including bans on shark fin sales in Hawaii, Oregon, Washington and parts of Canada. Last week, the California Senate also voted to ban the sale or possession of shark fins a billion-dollar global trade that has led to the brutal deaths of tens of millions of sharks a year and resulted in many open-ocean shark species being threatened with extinction. The Bahamas and Honduras have prohibited shark fishing in the last two years. ..” “For sharks, life at the top of the ocean food chain is becoming safer — at least from human predators.
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Yao Ming
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OVEREXPLOITATION OF WILD SPECIES How can we use wild species without threatening them?
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History of Overharvesting The myth of the “Noble Savage” - humans have a long history of overharvesting wildlife Late Pleistocene extinctions (~11 kya) in North America when “Clovis” people migrated across Bering Sea land bridge.
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Moas in New Zealand The absence of mammals in New Zealand allowed birds to become an ecologically dominant taxa Moas were the dominant herbivores playing the same role as large animals such as deer and elephants Radiation of ~10 species driven extinct by Maori colonizers ~1400 AD
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Technological Advances and Overharvesting
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and the Harvesting of Marine Species •Technological advances from outboard motors to floating fish factories have greatly increased the our ability to exploit marine species •80% of all harvested fish species are overexploited •Fishing down the food web, has resulted in the ecological extinction of many large fishes
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This note was uploaded on 12/17/2011 for the course ZOO 360 taught by Professor Staff during the Fall '08 term at Wisconsin.

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9. Overexploitation of Species - Making Headway in the...

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