Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 27, Problem 2RQ
Summary Introduction

To describe:

The meaning of the equation for population growth using the variables G,r,andN.

Introduction:

The changes in a population number could be due to birth rate, death rate, immigration, and emigration. Birth and immigration lead to adding individuals in a population and death and emigration leads to decrease individuals from a population. A wide gap between the birth and death rate could lead to faster growth in the rate of population.

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The growth rate of a population per unit of time is calculated by using this formula: G = r x N. What is the quantity r and how is it calculated?
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The per capita birth (b) and death (d) rates are measured for two populations across a range of population sizes in the attached figure. The equation for exponential growth rate is dN/dt=rN where the per capita growth rate is r=(b-d). The equation for logistic population growth rate is dN/dt=rN(1-N/K). With logistic growth, r varies as a function of the population size with density-dependent birth and/or death rates. See attached image If the death rate decreased, what would happen to the population trajectory for population A? a) increase faster b) increase slower c) decrease faster d) decrease slower
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