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.

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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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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