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 54.2, Problem 4R
Summary Introduction

To review:

Some density-independent and density-dependent features that could check the growth of population of an of bird cohort.

Given:

A cohort life table of an endangered bird species as calculated in Table 1, below.

Table 1: A cohort table representing the expected population of an endangered bird by the year 2035.

Years Age (x) Number of female birds (Nx) Number of female offspring (Nx offspring) Survivorship (lx) Fecundity (mx) lx m x x l x m x
2012 0 100 0 1 0 0 0
2013 1 50 75 0.5 1.5 0.75 0.75
2014 2 40 80 0.4 2 0.8 1.6
2015 3 30 60 0.3 2 0.6 1.8

Introduction:

Population growth of a species depends on various factors. One of the important factors is the density of population. Some of the factors that control population growth are density-dependent and some are density-independent.

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