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by: Judson Fisher
Judson Fisher
GPA 3.9

T. Even

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T. Even
Class Notes
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Popular in Ecology, Evolution, and Marine Biology

This 1 page Class Notes was uploaded by Judson Fisher on Thursday October 22, 2015. The Class Notes belongs to EEMB 142A at University of California Santa Barbara taught by T. Even in Fall. Since its upload, it has received 38 views. For similar materials see /class/226891/eemb-142a-university-of-california-santa-barbara in Ecology, Evolution, and Marine Biology at University of California Santa Barbara.

Popular in Ecology, Evolution, and Marine Biology




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Date Created: 10/22/15
1 What is the objective of this study and why is it signi cant The objective of this study is to examine and test the effect of wave disturbances on algal species abundance and richness in a marine boulder eld The study attempts to compare boulders based on how their frequencies of disturbance affect the patterns of species colonization The wave disturbances change succession sequences age of the colony and levels of diversity by creating patches of open space on the boulders for different species to populate The study is signi cant because it supports the nonequilibrium view of community structure which states that although species can globally persist disturbances prevent species from locally colonizing for many generations Local populations are constantly changing and going extinct due to disturbances in the physical environment 2 Did the author s approach and methods adequately test hisher hypothesis or answer herhis objectives Why or why not The author approached the study in two ways through observations and a field study In the observations the boulders were divided into three groups based on their monthly frequencies of disturbance measured by the amount of forces required to move them The author justifies the method of dividing by required force rather than boulder size by explaining that some boulders appear large but are easy to move while others appear small but require a large amount of force Estimates of the percent cover of macroalgae and sessile invertebrates on all the rocks were taken Samplings of species dominance and richness were repeated twice at the end of summerfall months and twice after harsh winter months The methods were successful in answering the objectives because they investigated a relationship between frequency of disturbance and the diversity and abundance of species on the boulders The only part of this approach that is faulty is that the boulder field was divided into six quadrats and some boulders could not be measured each time since they moved out of the quadrats Fewer quadrats would allow the boulders more space to be disturbed and sampled Afield study was also conducted because just through observations one could argue that frequency of disturbance correlates with boulder size and it could be changes in size that affected the species population In the


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