PracticeMidterm2

PracticeMidterm2 - Your name EEB 122b PRACTICE SECOND...

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Your name: _____________________ Page 1 EEB 122b PRACTICE SECOND MIDTERM
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Your name: _____________________ Page 2 1. You are interested in conducting an experiment with two competing species of plants. Below are the zero-growth isoclines for the two species. a) Draw the vectors that describe how N1 and N2 change at points A, B, C, and D on the graph above. (4 pts) b) Is the competition coefficient for N1 ( 1,2 ) greater than, equal to, or less than 1? (2 pts) c) Is inter- or intraspecific competition stronger for species 1? (2 pts) d) If you planted many individuals of each of these species in a field together and observed the community over many generations, which of the two plant species (if either) would you expect to go extinct? (2 pts) e) Why? (2 pts) C D
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Your name: _____________________ Page 3 2. During a survey conducted in October 2003, separate populations of a threatened endemic rodent species were found in each of several habitat patches around Lake Naivasha, Kenya. Each year storms flood burrows in an average of 40% of the occupied patches, causing local population extinctions. Despite the high level of disturbance caused by the storms, a survey conducted in October 2007 revealed that the rodent species has persisted in this region of Kenya. a) Describe how the rodent species may be able to persist in this region, despite frequent destruction of much of its habitat. (4 pts) b) Do these habitat patches constitute a metapopulation? (1 pt) c) Why or why not? (2 pts) d) What two major patch characteristics account for the colonization and extinction rates of local populations? (2 pts) Below is the life table of the rodent population found in one of the patches. x
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This note was uploaded on 02/07/2012 for the course EEB 122 taught by Professor Stephenstearns during the Spring '09 term at Yale.

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PracticeMidterm2 - Your name EEB 122b PRACTICE SECOND...

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