Biology : The Unity and Diversity of Life

Cecie Starr, Christine A. Evers; Lisa Starr

ISBN #9781337408332

15th Edition

734 Questions

4,261 Students Helped

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Summary

This section integrates core concepts of population ecology, from the estimation of population demographics using methods like plot sampling and mark–recapture to modeling population growth with exponential and logistic equations. It distinguishes between unlimited growth (exponential) and growth constrained by resources (logistic) and emphasizes the influence of biotic potential and carrying capacity. Life history traits and survivorship curves reveal evolutionary strategies (r-selection versus K-selection) while predation and human activities further shape population dynamics. Ultimately, understanding these concepts is vital for effective wildlife management, conservation, and addressing human impacts on global ecosystems.

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Example Problems

Example 1

The type of physical environment in which a species typically lives is its _________. a. niche c. community b. habitat d. population

Example 2

The type of physical environment in which a species typically lives is its a. niche b. habitat c. community d. population

Example 3

Most commonly, individuals of a population show $a$ _______ distribution within their habitat. a. clumped b. random c. nearly uniform d. none of the above

Example 4

The rate at which population size grows or declines depends on the rate of a. births b. deathss c. immigration d. emigration e. available resources f. all of the above

Example 5

Which cannot be a symbiosis? a. mutualism b. parasitism c. commensalism d. interspecific competition