Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 41.3, Problem 1CC
Why do high and low levels of disturbance usually reduce species diversity? Why does an intermediate level of disturbance promote species diversity?
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Habitats with moderate levels of disturbance have higher species diversity.
A) True
B) False
Based on the intermediate disturbance hypothesis, a community's species diversity is increased bya) frequent immigrations of new speciesb) moderate levels of disturbancec) intensive disturbance by humansd) stable conditions with no disturbance
Why do moderate levels of disturbance result in an increase in community diversity?a) The resulting uniform habitat supports stability, which in turn supports diversity.b) Less-competitive species evolve strategies to compete with dominant species.c) Habitats are opened up for less competitive speciesd) Competively dominant species infrequently exclude less competitive species after a moderate disturbance.
Chapter 41 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 41.1 - Explain how interspecific competition, predation,...Ch. 41.1 - According to the principle of competitive...Ch. 41.1 - MAKE CONNECTIONS Figure 22.13 illustrates how a...Ch. 41.2 - What two components contribute to species...Ch. 41.2 - How is a food chain different from a food web?Ch. 41.2 - WHAT IF? Consider a grassland with five trophic...Ch. 41.2 - MAKE CONNECTIONS Rising atmospheric CO2 levels...Ch. 41.3 - Why do high and low levels of disturbance usually...Ch. 41.3 - During succession, how might the early species...Ch. 41.3 - WHAT IF? Most prairies experience regular fires,...
Ch. 41.4 - Describe two hypotheses that explain why species...Ch. 41.4 - Describe how an islands size and distance from the...Ch. 41.4 - WHAT IF? Based on MacArthur and Wilsons island...Ch. 41.5 - What are pathogens?Ch. 41.5 - Prob. 2CCCh. 41 - The feeding relationships among the species in a...Ch. 41 - Prob. 2TYUCh. 41 - Prob. 3TYUCh. 41 - Community 1 contains 100 individuals distributed...Ch. 41 - Prob. 5TYUCh. 41 - SCIENTIFIC INQUIRY An ecologist studying plants in...Ch. 41 - FOCUS ON EVOLUTION Explain why adaptations of...Ch. 41 - FOCUS ON INFORMATION In Bateslan mimicry, a...Ch. 41 - SYNTHESIZE YOUR KNOWLEDGE Describe two types of...
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- What is the greatest cause for threatened species?arrow_forwardWhich of the following statements is/are consistent with the Intermediate disturbance hypothesis? Species diversity is maximized in areas that experience high levels of disturbance Areas with low levels of disturbance will be dominated by K selected species Decades of suppression in California has likely increased diversity in our national forests Areas with intermediate levels of disturbance will have the lowest levels of diversityarrow_forwardThe graph above is from a paper by Dave Tilman published in 1994. Which of the following statements is consistent with the graph? A) The results contradicts the intermediate disturbance hypothesis B) Increasing diversity increases community stability C) The results support the intermediate disturbance hypothesis.arrow_forward
- Based on the intermediate disturbance hypothesis,a community’s species diversity is increased by(A) frequent massive disturbance.(B) stable conditions with no disturbance.(C) moderate levels of disturbance.(D) human intervention to eliminate disturbance.arrow_forwardWhat is one way in which temporal changes in community species composition negatively impact delivery of an ecosystem service?arrow_forwardWhy do some species tend to grow exponentially while others tend to follow a logistic growth model?arrow_forward
- What is the impact of invasive aquatic species to the genetic diversity of wild species?arrow_forwardWhy do high and low levels of disturbance usually reducespecies diversity? Why does an intermediate level ofdisturbance promote species diversity?arrow_forwardWhat is a keystone species? How can a keystone species within a community be identified?arrow_forward
- What are the variables for sustainability for species diversity?arrow_forwardHabitats with moderate levels of disturbance have higher species diversity. Question 2 options: A) True B) Falsearrow_forwardWhat roles do competitive exclusion and character displacement play in community structure? Successional sequences are altered by consumers of pioneer species. What ecological features of the pioneer species contribute to this phenomenon? Describe the two key elements of community stability.arrow_forward
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