Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Chapter 21, Problem 12CTQ
Describe the mechanisms by which human population growth and
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If the human species were to suffer a population crash, list three species that might move in to occupy part of our ecological niche. List and explain three species that would likely decline as a result.
Environments with low frequency and intensity of disturbance tend to have ________ species diversity because ______.
Group of answer choices
A) low; the best competitors exclude any other species
B) high; disturbances kill off a large number of individuals
C) low; there are fewer late-successional species than early-successional species
D) high; more species can colonize over a longer period of time
Question:
Answer choice selection is either: Burkina Faso or Italy for all three answer choices
BLANK between species with BLANK ecological niches means they are les likely to occur sympatrically
A) Competition; similar
B) Predation; similar
C) Competition; dissimilar
D) Predation; dissimilar
E) None of the above
Chapter 21 Solutions
Concepts of Biology
Ch. 21 - Figure 21.6 The Svalbard seed vault is located on...Ch. 21 - The number of currently described species on the...Ch. 21 - A secondary plant compound might be used for which...Ch. 21 - Pollination is an example of ________. a. a...Ch. 21 - Converting a prairie to a farm field is an example...Ch. 21 - Which two extinction risks may be a direct result...Ch. 21 - What kind of ecosystem are exotic species...Ch. 21 - Certain species of parrot cannot be brought to the...Ch. 21 - What is the name of the first international...Ch. 21 - Explain how biodiversity loss can impact crop...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- List five characteristics of organisms that show a convex survivorship curvearrow_forwardWhich of the following is true of a population approaching its carrying capacity? a) The population’s emigration is greater than its immigration. b) The population has access to unlimited resources. c) Intraspecific competition decreases. d) The population’s rate of increase approaches zero.arrow_forwardList and describe the four main human-induced threats to species.arrow_forward
- 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.arrow_forwardThe principle of competitve exclusion states thata) Competition between two species always causes extinction or emigration of one species.b) Two species will stop reproducing until one species leaves the habitat.c) Two species cannot coexist in the same habitat. d) Two species that have exactly the same niche cannot coexist in a community.arrow_forwardWhich curve on the graph represents a species that produces high numbers of offspring with little paternal care? a) Graph 1 b) Graph 2 c) Graph 3 d) Graph 4arrow_forward
- Two alien species compete for resources on a planet far far away. Their initial populations are 100 and 1000 and their specific growth rate is 0.02263/year and 0.02/year and their yield coefficient is 0.95 and 0.85 respectively. When the first species begins to consume more than 50% of the resources the other population will be inevitably be annihilated. How many years does it take for this to occur? Answer:arrow_forwardThe per capita growth rate of a population where dispersal is not a factor is expressed as (a) i + e (b) b d (c) dN/dt (d) rN(K N) (e) (K N) Karrow_forwardDescribe what happens to an ecosystem when a keystone species is removed.arrow_forward
- Environmental scientists David Pimentel, Rodolfo Zuniga, and Doug Morrison of Cornell University reviewed scientific estimates for the economic and ecological costs imposed by introduced and invasive species in the United States. They found that, as of 2005, approximately 50,000 species had been introduced in the United States and that these accountedfor over $120 billion in economic costs each year. These costs include direct losses and damage, as well as costs required to control the species. (The researchers did not quantify monetary estimates for losses of biodiversity, ecosystem services, and aesthetics, which they said would drive total costs several times higher.) Calculate values missing from the table to determine the number of introduced species of each type of organism and the annual cost that each imposes on our economy. Of the 50,000 species introduced into the UnitedStates, half are plants. Describe two ways in whichnon-native plants might be brought to a new location.How…arrow_forwardPredators that are keystone species can maintain species diversity in a community if theya) reduce the number of disruptions in the community.b) prey only on the least abundant species in the community.c) prey on the community's dominant species.d) competively exclude other predatorsarrow_forwardQuestion 3 Which of the following does not directly affect the intensity of competition? Question 3 options: A) Niche overlap. B) Niche breadth. C) The density of competitors. D) The presence of similar species. Question 4 When disturbance is frequent, competition is often less intense. Question 4 options: A) True B) Falsearrow_forward
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