BSsqans-lect26 extinctions

BSsqans-lect26 extinctions - BIS 1B (Winter 2008) Study...

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BIS 1B (Winter 2008) Study question answers: Extinctions Lecture 26 1. What are some characteristics and causes of background extinction? Back ground extinction is a relatively continuous process, it produces a gradual loss of species (different species groups have different background extinction rates) and is caused by normal ecological processes such as competition, parasitism, predation. 2. How would you characterize the difference between background and mass extinctions? Mass extinctions refer to global increases in rates of extinction occurring over a relatively brief period of time –as long as a few million years and which are discontinuous in nature. It is thought that such extinctions are caused by catastrophic events such as episodes of volcanism, massive releases of gas from deep-sea sediments or by earth fall of large meteorites. 3. List some biological and environmental factors that facilitate extinction. Predators
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This note was uploaded on 04/07/2010 for the course BIS 2 taught by Professor Schwartzandkeen during the Fall '09 term at UC Davis.

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BSsqans-lect26 extinctions - BIS 1B (Winter 2008) Study...

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