Zebra - produced per individual of female young produced per original individuals For graph 0 to 1 165 1 to 2 127 2 to 3 116 28 3 to 4 110 26 4 to

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Name:_____________________ Section:_______________  Assignment #2—Life Tables The life table below has been adapted from:  Spinage C.A.  1972 African ungulate life tables.  Ecology   53 : 645- 652. The plains zebra ( Equus burchelli ) are found in eastern Africa  living in herds. Each zebra has unique stripes which is conducive  for performing population studies and tracking individuals.  However the work described in this paper uses zebra skulls to  recreate population structure. More specifically, they collected  skulls of naturally killed  zebras in the Akagera National Park in Rwanda to estimate the number  of individuals in each age class. Fill out the life table below: x a x l x F x m x l x m x Log 10 l x age class (years) # entering  age class Proportion  surviving to  start of age  class # of females  produced by  age class # of females 
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Unformatted text preview: produced per individual # of female young produced per original individuals For graph 0 to 1 165 1 to 2 127 2 to 3 116 28 3 to 4 110 26 4 to 5 106 25 5 to 6 95 23 6 to 7 84 20 7 to 8 77 19 8 to 9 73 18 9 to 10 73 18 10 to 11 65 16 11 to 12 51 12 12 to 13 46 11 13 to 14 46 11 14 to 15 38 9 15 to 16 26 6 16 to 17 R = Answer the following questions: 1. Is this population stable? Decreasing? Increasing? How can you tell? 2. Graph log 10 l x on the paper grid below. Which age class is most vulnerable and in which age class is the risk of death lowest? 3. This paper was published in 1972. What has changed since then that might pose a threat to this species? What life stages might these threats affect? Discuss at least 3 threats....
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This note was uploaded on 12/25/2009 for the course ENV S 100 taught by Professor Staff during the Fall '08 term at UCSB.

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Zebra - produced per individual of female young produced per original individuals For graph 0 to 1 165 1 to 2 127 2 to 3 116 28 3 to 4 110 26 4 to

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