Catastrophe 29
Catastrophe 29 : A major change in the environment that causes extensive damage and usually widespread death, and occurs so infrequently that the effects of natural selection by similar events in the past (if they have ever occurred) do not remain in the 'genetic memory' of the species. The Mt St Helens volcanic eruption was in this sense a catastrophe (cf. the recurrent hurricanes in eastern USA which may be defined as 'disasters'). (From: http://www.blackwellpublishing.com/Townsend/Glossary/GlossaryC.asp on 8 July 2004)
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