What is Life? A Guide to Biology with Physiology
3rd Edition
ISBN: 9781464157745
Author: Jay Phelan
Publisher: W. H. Freeman
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Chapter 14, Problem 5SA
Summary Introduction
To analyze:
Two examples of natural populations whose growth patterns deviate from the more typical
Introduction:
Most of the populations usually follow a logistic growth pattern, where the population increase till the
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Distinguish between the exponential and logistic growth of a population and describe the nature of their growth curves. Define environmental resistance. What is the carrying capacity of an environment? Define and give an example of a population crash.
Draw a graph with a growth curve for a population that starts at 10 individuals and experiences exponential growth. Draw a second graph with a growth curve for a population that starts with 10 individuals and undergoes logistic growth. The second graph should have a carrying capacity of 100 individuals. Please give a proper written explanation for the graphs.
Give two examples of density-dependent and two examples of density-independent factors that can limit the growth of a population.
Chapter 14 Solutions
What is Life? A Guide to Biology with Physiology
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- Identify examples of populations that would exhibitopportunistic growth.arrow_forwardShow how you build the logistic model for population growth from the exponential model equation? What part of the logistic growth equation produces the sigmoidal growth curve?arrow_forwardThe maximum sustainable yield (MSY) is the highest rate at which a potentially renewable resource can be used indefinitely without reducing its available supply. The idea is to remove individuals while keeping the population at a constant growth rate and size, but to find the size where the harvest is maximized. The greater the growth rate, the more individuals you can remove and not change the population size. Where is the growth rate at its maximum? To find this look at your logistic model simulator. 1. Set up a hypothetical salmon population where the carrying capacity is 20,000 fish, the maximumr is 0.7. According the the maximum sustainable yield (MSY), at what population size should we maintain the salmon while fishing?arrow_forward
- During what phase of the growth curves in each diagram is the population just beginning to colonize an area? (C) a) Which type of population growth appears to continue unchecked? b) The growth curves in the Model are often referred to using the letters of the alphabet they resemble. The logistic growth curve is sometimes referred to as an S-curve. What letter would you use to describe the exponential growth curve? c) What causes the population to slow down during logistic growth? d) The maximum population an environment can sustain is affected by environmental factors that cause the population to level out or become stable. What term is used to describe this level of logistic growth? Diagram A-Exponential Growth Curve Population Numbers Exponential growth Lag phase Time Population Numbers Diagram B-Logistic Growth Curve Lag phase Time Carrying capacity (K) Pressure begins due to environmental resistancearrow_forwardBoth density-dependent and density-independent factors can influence population growth. Distinguish between density-dependent and density-independent factors, and describe an example of eacharrow_forwardWhen does the growth rate of a population following the logistic model equal zero?the logistic model is given as dN/dt = rN (1-N/K)arrow_forward
- Describe the stages of a typical population growth curve.arrow_forwardgive natural examples of density-independent Population regulation (e.g. aquatic weed in South America etc.)arrow_forwardIn the logistic growth equation the highest instantaneous population growth rate (dN/dt) is reached When the population is smallest, because then intraspecific competion and thereby resource limitation is weakest When the population is near K, because the largest population still growing has the highest growth rate, as it has the highest number of reproducing adults When the population is in the middle between zero and K (N = K/2) because then the trade-off between still having modest negative effects of intraspecific competition on growth rate but having a relatively high population size of individuals that could be reproducing is optimalarrow_forward
- In the logistic model of population growth, per capita growth rates are highest at __ densities and population growth rates are highest at ___ density (NOTE: assume ‘high’ refers to at or near K). A) low, intermediate B) low, low C) low, high D) None of the above are truearrow_forwardDefine exponential growth and logistic growth.arrow_forwardWhere is the growth rate the fastest on a logistic growth curve? at the inflection point in the very beginning when the population is small right before it reaches the carrying capacityarrow_forward
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