Stachowitz Final Study Guide

Stachowitz Final Study Guide - Draw a graph describing the...

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Draw a graph describing the intermediate disturbance hypothesis (IDH) and describe what determines diversity at low, intermediate, and high frequency of disturbance under this hypothesis. Give an example of a community that appears to conform to the IDH and describe the evidence that makes you think this. - At low frequencies of disturbance, there are more K-selected species because they have had  enough time to grow and compete successfully with others for space and resources, outcompeting  the r-selected species (which are bad competitors). At high frequencies of disturbance, there are  more r-selected species because they are good at initial colonization in disturbed areas and not  enough time has elapsed for K-selected species to outcompete them. At intermediate disturbance  frequencies, there will be the max amount of diversity because not enough time has elapsed for the  K-selected species to completely outcompete the r-selected species, but enough time has elapsed  for the K-selected species to begin appearing, so both groups of species are present. - An example of a community would be on different sized rocks on ocean shores which have waves  washing over them. The small sized rocks which get knocked around a lot by the waves would  have more r-selected species, the larger sized rocks which don’t get knocked around would have  more K-selected species, and the intermediate-sized rocks would have a mixture of both r- and K- selected species. A. What is meant by indirect effects in food webs? B. Describe two types of indirect effects (do
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Stachowitz Final Study Guide - Draw a graph describing the...

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