The data below represent a cohort of organism “X”, tracked from birth to death. Time period* Number alive at start of period Proportion surviving at start of time interval Deaths during period Rate of mortality during time period "0-1" 432 1.00 390 0.90 "1-2" 42 0.10 29 0.69 "2-3" 13 "3-4" 11 "4-5" 10 "5-6" 9 "6-7" 7 "7-8" 3 "8-9" 0 * Numbers are reported over eight equal sized time periods – these could represent days, weeks, months or years. a) Complete the table by recording survivorship (proportion alive at the start of the time period), the number of deaths and the mortality rate for each time period. For each column you need to ensure you indicate how you performed your calculation (e.g. show one example calculation or provide a formula). b) Plot a survivorship curve for species X using semi-log graph paper. A template sheet has been uploaded to the Problem Set 2 folder. Remember that survivorship is, by convention, plotted as a proportion of 1000 (so the first time period should reflect a population of 1000). c) Comment on and interpret the shape of the survivorship curve: i. Describe the shape of the curve; which of the three idealised patterns (Type I, II or III) does it most closely resemble? ii. In terms of its reproductive strategy, would you predict species X to be an r- or Kstrategist? Explain your answer. iii. Based on these data, suggest an organism which species X might represent, explaining your logic.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter45: Population And Community Ecology

Section: Chapter Questions

Problem 31CTQ: The CDC released the following data in its 2013 Vital Statistics report. Age interval Number dying...

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The data below represent a cohort of organism “X”, tracked from birth to death. Time period* Number alive at start of period Proportion surviving at start of time interval Deaths during period Rate of mortality during time period "0-1" 432 1.00 390 0.90 "1-2" 42 0.10 29 0.69 "2-3" 13 "3-4" 11 "4-5" 10 "5-6" 9 "6-7" 7 "7-8" 3 "8-9" 0 * Numbers are reported over eight equal sized time periods – these could represent days, weeks, months or years. a) Complete the table by recording survivorship (proportion alive at the start of the time period), the number of deaths and the mortality rate for each time period. For each column you need to ensure you indicate how you performed your calculation (e.g. show one example calculation or provide a formula). b) Plot a survivorship curve for species X using semi-log graph paper. A template sheet has been uploaded to the Problem Set 2 folder. Remember that survivorship is, by convention, plotted as a proportion of 1000 (so the first time period should reflect a population of 1000). c) Comment on and interpret the shape of the survivorship curve: i. Describe the shape of the curve; which of the three idealised patterns (Type I, II or III) does it most closely resemble? ii. In terms of its reproductive strategy, would you predict species X to be an r- or Kstrategist? Explain your answer. iii. Based on these data, suggest an organism which species X might represent, explaining your logic.

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