Growth of a population can be hindered by either density-dependent or density-independent mechanisms. Define and contrast these two mechanisms. Offer examples of how growth of the human popula-tion might be curbed by either agent

Growth of a population can be hindered by either density-dependent or density-independent mechanisms. Define and contrast these two mechanisms. Offer examples of how growth of the human popula-tion might be curbed by either agent

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter19: Population And Community Ecology

Section: Chapter Questions

Problem 20CTQ: Give an example of how density-dependent and density-independent factors might interact.

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Communities and Ecosystems

Ecology contains two words: Eikos means dwelling, and logy means to study, so the combined meaning is studying habitat or living.

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Populations are unable to sustain exponential growth for very long because environments are not unlimited. Eventually growth rates are reduced by a shortage of food, space or some other factor. These factors constitute what is known as ‘environmental resistance’ and their effect upon growth may produce a logistic growth curve. The data shown in the Table below illustrate this pattern of growth for three species’ populations, each beginning with a population of 10 individuals. Table 1: Temporal changes in the numbers of individuals of three different species’ populations, observed in the wild. Time (units) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Population 1 10 15 20 28 39 48 57 66 81 88 93 107 108 108 108 108 119 Population 2 10 11 12 14 17 19 21 25 29 33 37 41 40 43 46 49 46 Population 3 10 17 27 39 52 64 67 69 70 78 83 86 88 80 84…
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