Ecology 6 - The ecology of parasites and disease Whats the...

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1 The ecology of parasites and disease What’s the difference between a predator & a parasite/disease organism? What’s the difference between a predator & a parasite/disease organism? • Both feed on “prey” • Predator usually kills prey; parasite/disease may or may not • Predator usually close to size of prey; parasite/disease usually smaller than prey
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2 Questions • Why are some diseases & parasites epidemic? • What role does non-human ecology play? • Does evolution help or hurt the victim? • What are the effects on host population dynamics? I. Epidemics • Disease level above that “expected” • Widespread, geographically and among individuals in population • Vs. pandemic, endemic
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3 Siege of Caffa (Crimean Peninsula) by Mongol army….
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4 But gone from Europe by 1800… Characteristics • Easily transmitted from person to person – Associated with human movement • Recurring epidemics – Deaths in future epidemics not as catastrophic regionally; argues either • Reduction in disease virulence • Increase in host immunity
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5 If I am asked what is the cause of pestilence… I say that it arises from the sea… For the devil, by the power committed to him when the seas rise up high, is voiding his poison, sending it forth to be added to the poison in the air, and that air spreads gradually from place to place and enters man
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This note was uploaded on 11/08/2009 for the course HUMBIO 2A taught by Professor Boggs,c;durham,w during the Spring '08 term at Stanford.

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Ecology 6 - The ecology of parasites and disease Whats the...

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