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13 Cards in this Set
- Front
- Back
habitat degradation, fragmentation, and distruction often followed by
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overexploitation, invasive species, and disease
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over-exploitation by humans has been estimated to currently threatened about
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1/4 of US vertebrates
3/4 of china |
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global climate change will also make bilogical communites
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more vulnerable to these threats in the future
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The greater level of exploitation in china results from it
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larger, poor, rural populations and extensive use of wildlife for bothe food and tradtional medicine
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in the past humans could sustainably harvest and hunt plants and animals but now
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human population have increased, used of the environment has escalated, and harvesting methods have become dramatically more effective
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Vast human population and improved technology have resulted
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in unsustainable harvest
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bushmeat crisis
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the decline in animal populations caused by the intensive hunting of animals, major concern for wildlife officaials and conservation biologists especially in Africa
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Solutions for bushmeat crisis:
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restricted sale and transport of bushmeat, restricting sale of firearms and ammunition, closing roads
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The ____ and ____ trade in wildlife is responsible for the decline of many species
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legal and illegal
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as supply diminishes the prices
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rises, creating a stong incentive to overexploit the resource, once so extracted it becomes rare extinct and then another species is targeted
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major groups of targeted worldwide trade in wildlife
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primates 40,000
birds 4 million reptiles 640,000 ornamental fish 350 million reef corals 1000-2000 tons orchids 9-10 million cacti 7-8 million |
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Maximum sustainability yield
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the greatest amount of resouce that can be harvested each year and be replaced through population growth without detriment to the population Y=rB/4 (r= growth rate, B= carrying capacity)
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bycatch
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incidentally caught marine vertibrates and invertebrates caught in net that die/ injuried
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