1 SEM CARDLESS ACC W/RAVEN TEXT
12th Edition
ISBN: 9781265321062
Author: Raven
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 58, Problem 5S
Summary Introduction
To discuss:
The small population size causes extinction or some other factors lead to the extinction of small population.
Introduction:
The term extinction in biology refers to the death of the last individual of the species. After extinction, the species gets terminated forever. The
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The Earth is currently experiencing the sixth mass extinction event. Conservation efforts attempt to identify and focus on the
species most at risk of going extinct.
Which characteristics make species more vulnerable to extinction?
species that have a generalized diet
species that have a small population size
species that are not negatively affected by introduced species
species that are used by humans for food and clothing
species that have a long life span
You are watching a documentary on television about grizzly bears in North America. The narrator is speaking over a clip of two cubs and their mother walking along a riverbank in a heavily wooded forest. She says that grizzly bear populations are rising for the first time in several decades even though deforestation is still a growing problem in North America.
Which of the following could be a possible factor for the increase in the grizzly population?
Loss of habitat
Reduction of resources
Increased industrialization
Higher birth rate over death rate
Extinction is the elimination of all the individuals of a particular kind.
Select one:
True
False
Chapter 58 Solutions
1 SEM CARDLESS ACC W/RAVEN TEXT
Ch. 58.1 - Describe the history of extinction through time.Ch. 58.1 - Prob. 2LOCh. 58.2 - Prob. 1LOCh. 58.2 - Prob. 2LOCh. 58.3 - Prob. 1LOCh. 58.3 - Explain how these causes can interact to bring...Ch. 58.4 - Prob. 1LOCh. 58.4 - Describe the potential roles of natural selection...Ch. 58.4 - Prob. 3LOCh. 58.5 - Prob. 1LO
Ch. 58.5 - Prob. 2LOCh. 58.5 - Prob. 3LOCh. 58 - If we assume that population density is a good...Ch. 58 - Prob. 2DACh. 58 - Would the extinction rate increase if an area were...Ch. 58 - Prob. 4DACh. 58 - Why do population density and growth rates differ...Ch. 58 - Why might whale populations fail to recover once...Ch. 58 - Why do small populations lose genetic variation?Ch. 58 - Prob. 1UCh. 58 - The economic value of indirect ecosystem services...Ch. 58 - The amphibian decline is best described as a....Ch. 58 - Prob. 4UCh. 58 - When populations are drastically reduced in size,...Ch. 58 - A captive-breeding program followed by release to...Ch. 58 - Historically, island species have tended to become...Ch. 58 - Ninety-nine percent of all the species that ever...Ch. 58 - To effectively address the biodiversity crisis,...Ch. 58 - The introduction of a nonnative predator to an...Ch. 58 - If 99% of the species that ever existed are now...Ch. 58 - Prob. 2SCh. 58 - Prob. 3SCh. 58 - Prob. 4SCh. 58 - Prob. 5S
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- How does extirpation differ from extinction? Group of answer choices Extinction and extirpation are the same thing. Extirpation is the loss of a single population, while extinction is the loss of an entire species. Extinction only happens during a mass extinction. Extinction is the loss of a single population, while extirpation is the loss of an entire species.arrow_forwardEastern loggerhead shrike is a critically endangered species of bird in Canada. Its population has been declining since the 1960s, and it has been speculated that habitat loss, pesticide usage combined, and climate change have affected the shrike population size. In 2004, there were approximately 70 loggerhead shrikes breeding in Canada. Over the next five years, 111 new shrikes were born, 57 died, and 15 left the area. Calculate the change in the population of eastern loggerhead shrike between 2004 and 2009. Express your answer rounded to the nearest whole number. Answerarrow_forwardIf 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.arrow_forward
- Can you please explain when the population size gets unaffected, smaller, and larger than expected?arrow_forwardA population of 1,492 finches is introduced to a rainforest. Over the next year, the finches show a death rate of 0.395 while the population drops to 1,134. What's the birth rate for this population? Is this proving to be a suitable habitat? (Two answers) * O Yes, this is a suitable habitat. The birth rate is higher than the death rate. No, this is not a suitable habitat. The birth rate is much lower thn the death rate. 589 D 358 O 0.155 O 0.845 Which of the following is true of a population approaching its carrying capacity? O The population's rate of increase approaches zero, O O O O OCarrow_forwardIn your region, what species are threatened with extinction? Why are they vulnerable? Suggest steps that could be taken to increase their populations.arrow_forward
- What is an example of how migration causes changes in gene frequencies? Genetic material can become lost over time due to lack of reproduction when animals migrate. When animals migrate, their genes mutate on their own, changing the frequency that a gene allele shows up. When animals migrate, the mating becomes less random, causing inbreeding and, therefore, shifts in the proportion of alleles. Seeds of plants are carried to different locations and introduced to a new population, adding their own genetic material and, therefore, changing gene frequencies.arrow_forwardA population of 1,492 finches is introduced to a rainforest. Over the next year, the finches show a death rate of 0.395 while the population drops to 1,134. What's the birth rate for this population? Is this proving to be a suitable habitat? (Two answers) * Yes, this is a suitable habitat. The birth rate is higher than the death rate. No, this is not a suitable habitat. The birth rate is much lower then the death rate. 589 -358 0.155 0.845 Which of the following is true of a population approaching its carrying capacity? The population's rate of increase approaches zero. ロロロ□arrow_forwardDescribe the mechanisms by which human population growth and resource use causes increased extinction rates.arrow_forward
- As we saw last week, population size is important. Ideally, this means you started with a lot of genetically diverse founders, but of course that isn’t always the case. In the case of the Española Galapagos tortoises it was 12 females and 2 males. So, often you have to grow your population to stabilize it and ensure there isn’t an unacceptable loss of genetic diversity over time, even if that genetic diversity is low. If you think back to the math from last week and do a little not so fancy algebra, you can see that genetic deterioration occurs at a rate that is the inverse of genetic retention, which you probably remember is 1- (1/2Ne) Assume that the Española Galapagos tortoise captive population started with an Ne/N ratio of 0.7. Calculate their rate of loss of genetic diversity given their original population size of 14 tortoises (N=14). You will first need to solve for Ne, then plug Ne into the rate of loss of genetic diversity formula. Now let’s work on growing the population.…arrow_forwardWhat forces can cause populations to decline?arrow_forwardIn 1995, a population of 31 gray wolves was introduced into Yellowstone National Park. The population of the gray wolves fluctuated in the 20-year period after introduction. In 2019 an estimated 80-110 wolves are present in the park. Wolves, elk, and bison are native to Yellowstone, but the wolves disappeared in the 1920s due to excessive hunting. Wolves are primarily carnivores, and elk and bison are primarily herbivores. A team of scientists monitored the population of wolves in Yellowstone for the first 20 years after their release. Number of Individuals 200 180 160 140 120 100 80 60 40 20 0 Number of Individuals Figure 1. Number of Wolves in Yellowstone After Release The scientists also monitored the populations of elk and bison in Yellowstone for the first 20 years after the wolves' release. Figure 2. Number of Elk and Bison in Yellowstone After Wolf Release 16,000 14,000 12,000 10,000 8,000 6,000 4,000 2,000 0 Number of Elk Calves per 100 Adult Females 40 30 2 4 6 8 10 12 14 16…arrow_forward
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