Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 54, Problem 12TYU
Summary Introduction
To propose: A hypothesis with the help of the principles of community ecology.
Concept introduction: The principle of “competitive exclusion” given by Gause states that “two species with same ecological niche cannot coexist”. In other words, the two species that utilize the same limited
Given data:
- Two identical plots with sagebrush plants and annual wildflowers.
- Fence.
- Kangaroo rats.
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An ecologist studying plants in the desert performed the following experiment. She staked out two identical plots, which included a few sagebrush plants and numerous small, annual wildflowers. She found the same five wildflower species in roughly equal numbers on both plots. She then enclosed one of the plots with a fence to keep out kangaroo rats, the most common grain-eaters of the area. After two years, to her surprise, four of the wildflower species were no longer present in the fenced plot, but one species had increased dramatically. The control plot had not changed. Using the principles of ecology, propose a hypothesis to explain her results. What additional evidence would support your hypothesis?
SCIENTIFIC INQUIRY An ecologist studying desert plantsperformed the following experiment. She staked out twoidentical plots, containing sagebrush plants and small annualwildflowers. She found the same five wildflower species inroughly equal numbers on both plots. She then enclosed oneplot with a fence to keep out kangaroo rats, the most commongrain-eaters of the area. After two years, four of the wildflowerspecies were no longer present in the fenced plot, but onespecies had become much more abundant. The control plothad not changed in species diversity. Using the principles ofcommunity ecology, propose a hypothesis to explain her results.What additional evidence would support your hypothesis?
Ernie's school has three greenhouses, located in three parts of the school. Ernie notices that the plants in one
greenhouses are smaller than the same species in the other greenhouses. Ernie's biology teacher says she has
been having a problem recently with growing plants in this particular greenhouse. Ernie's lab group decides to
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Chapter 54 Solutions
Campbell Biology
Ch. 54.1 - Explain how competition, predation, and mutualism...Ch. 54.1 - According to the principle of competitive...Ch. 54.1 - MAKE CONNECTIONS Figure 24.14 illustrates how a...Ch. 54.2 - What two components contribute to species...Ch. 54.2 - How is a food chain different from a food web?Ch. 54.2 - Prob. 3CCCh. 54.2 - Prob. 4CCCh. 54.3 - Why do high and low levels of disturbance usually...Ch. 54.3 - Prob. 2CCCh. 54.3 - WHAT IF? Most prairies experience regular fires,...
Ch. 54.4 - Describe two hypotheses that explain why species...Ch. 54.4 - Prob. 2CCCh. 54.4 - Prob. 3CCCh. 54.5 - What are pathogens?Ch. 54.5 - WHAT IF? Rabies, a viral disease in mammals, is...Ch. 54 - Interspecific interactions affect the survival and...Ch. 54 - Based on indexes such as Shannon diversity, is a...Ch. 54 - Is the disturbance pictured in figure 54.25 more...Ch. 54 - How have periods of glaciation influenced...Ch. 54 - Prob. 54.5CRCh. 54 - Prob. 1TYUCh. 54 - The principle of competitive exclusion states that...Ch. 54 - Based on the intermediate disturbance hypothesis,...Ch. 54 - According to the island equilibrium model, species...Ch. 54 - Prob. 5TYUCh. 54 - Prob. 6TYUCh. 54 - Prob. 7TYUCh. 54 - The most plausible hypothesis to explain why...Ch. 54 - Community 1 contains 100 individuals distributed...Ch. 54 - Prob. 10TYUCh. 54 - EVOLUTION CONNECTION Explain why adaptations of...Ch. 54 - Prob. 12TYUCh. 54 - WRITE ABOUT A THEME: INTERACTIONS In Batesian...Ch. 54 - Prob. 14TYU
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