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13 Cards in this Set

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  • Back
habitat degradation, fragmentation, and distruction often followed by
overexploitation, invasive species, and disease
over-exploitation by humans has been estimated to currently threatened about
1/4 of US vertebrates
3/4 of china
global climate change will also make bilogical communites
more vulnerable to these threats in the future
The greater level of exploitation in china results from it
larger, poor, rural populations and extensive use of wildlife for bothe food and tradtional medicine
in the past humans could sustainably harvest and hunt plants and animals but now
human population have increased, used of the environment has escalated, and harvesting methods have become dramatically more effective
Vast human population and improved technology have resulted
in unsustainable harvest
bushmeat crisis
the decline in animal populations caused by the intensive hunting of animals, major concern for wildlife officaials and conservation biologists especially in Africa
Solutions for bushmeat crisis:
restricted sale and transport of bushmeat, restricting sale of firearms and ammunition, closing roads
The ____ and ____ trade in wildlife is responsible for the decline of many species
legal and illegal
as supply diminishes the prices
rises, creating a stong incentive to overexploit the resource, once so extracted it becomes rare extinct and then another species is targeted
major groups of targeted worldwide trade in wildlife
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
Maximum sustainability yield
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)
bycatch
incidentally caught marine vertibrates and invertebrates caught in net that die/ injuried