Life: The Science of Biology
Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 54, Problem 3Q
Summary Introduction

To analyze:

The generation time (G) for given population by completing the last column of the given Table 1.

Given:

An incomplete cohort life table is provided, from which the components given in column 5 is to be calculated.

Table 1: A life table of Australian sharpnose shark showing survivorship and fecundity.

Age (x) Survivorship of females (lx) Fecundity of female offspring (mx) lx mx x lx mx
0 1 0 0
1 0.32 1.98 0.63
2 0.19 2.59 0.49
3 0.11 2.81 0.31
4 0.06 2.89 0.17
5 0.03 2.92 0.08
6 0.02 2.93 0.06
7 0.01 2.93 0.03
8 0.005 2.93 0.014
9 0.003 2.93 0.008
10 0.002 0 0

Introduction:

The generation time of a cohort is considered as the average age of the individuals who have produced or are expected to produce offspring in a cohort. It can be calculated by the sum of (x lx mx) divided by the reproductive rate, R0 of the population.

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