Conservation Bio Main Points 9-17-07

Conservation Bio Main Points 9-17-07 - Conservation Bio...

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Conservation Bio Main Points 9-17-07 Why be concerned with endemic species? o The narrower the distribution the higher likelihood of extinction o True in geological record o True today due to human activities Chapter 3: Threats to Biodiversity Habitat degradation, overexploitation, invasive species, anthropogenic climate change, introduction of toxic chemicals-bioaccumulation Synergism: Total effect greater than the sum “Snowballing” effects: One disturbance leads to exacerbation of others Rinderpest o Virus introduced into East Africa in 19 th century o Virus moved in with domestic cattle o Within 10 years 90% of wildebeests, cape buffalos, died o Vaccination of cattle beginning in 1960’s led to great recovery of species o Increase also led to an increase of lions and hyenas who prey on ungulates o Increase in hyenas led to decrease in gazelles o Plants also affected, increase in species diversity and population sizes during ungulate decline o Greatly affected vertebrate and plant community over 50 year period and there was
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Conservation Bio Main Points 9-17-07 - Conservation Bio...

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