Lecture 9 Communities D

Lecture 9 Communities D - 2/17/09 VI. DISTURBANCE...

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2/17/09 1 VI. DISTURBANCE A. Disturbance – event that changes a community Fire, storm, flood, landslide, freeze, etc. The large-scale fire in Yellowstone National Park in 1988 Volcanic eruption of Mount St Helens, 1980 before immediately after 1984 A. Disturbance – event that changes a community Fire, storm, flood, landslide, freeze, etc. Some communities depend on disturbance (fire - lodgepole pine) A. Disturbance – event that changes a community Fire, storm, flood, landslide, freeze, etc. Some communities depend on disturbance Can decrease or increase species diversity
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2/17/09 2 Intermediate Disturbance Hypothesis – greatest species diversity with moderate disturbance (flooding) Stream invertebrates B. Human Disturbance Australian aborigines managed landscape with fire *kept brush down to make game easier to see *young vegetation was more palatable for game *as aborigines forced to abandon traditional lifestyles, fires stopped, species diversity decreased Intermediate Disturbance Hypothesis? Kakadu National Park, Australia
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This note was uploaded on 04/29/2009 for the course BILD BILD 2 taught by Professor Schroeder during the Spring '08 term at UCSD.

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Lecture 9 Communities D - 2/17/09 VI. DISTURBANCE...

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