Concept explainers
To review:
The given blank space in the statement, “a species may be at higher risk of extinction if its geographic range includes a ______ area, or if its food or habitat requirements are _______. The leading direct cause of extinction is _______.”
Introduction:
New species are formed by the long and gradual process of evolution. This results in the introduction of genetically diversified genes into the organism. This phenomenon allows the organism to thrive into an environment where they are able to carry out their daily
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BIOLOGY:LIFE ON EARTH-W/ACCESS
- What specific traits would decrease a species' risk of extinction? Provide examples and explanations.arrow_forwardYou are part of a restoration ecology program that is attempting to reintroduce an endangeredbird to a new habitat in Michigan, where they have been locally extinct for decades. The species went through an extreme bottleneck after they were almost wiped-out due to insecticide use in the 1960s. Maintaining what limited genetic diversity remains is an important priority, especially because disease spread from other bird speciesrepresents a major threat to the struggling populations of these birds. Captive-bred warblersdestined for this site have been genotyped at a neutral marker locus “D” with two alleles, D95and D135. The genotype counts in the captive animals are as follows:D135/D135 = 12, D135/D95 = 20, and D95/D95 = 48 2a. If all the species are used to start the new population, what is the probability that thepopulation eventually becomes fixed for allele D95 through drift?2b. Let’s assume the population stays the same size (as the number of introduced individuals) inthe new…arrow_forwardA recent United Nations analysis report gathered data on declines in biodiversity across the world. Using the graphs provided, which statement shows an area of concern and is an alternative to the general hypothesis "Humans are responsible for a significant increase in the extinction rate among species in the world today as a result of damage caused to the environment"? A. Fertilizer use in developing countries should be encouraged to decrease the extinction rate B. Decreasing air pollution in the least developed countries would decrease species survival rate C. Protection of key biodiversity areas should be a priority for developed countries to lower the extinction rate D. Assisting developing countries with more sustainable methods of extraction of living biomass would increase species survival ratesarrow_forward
- If human activities allow an invasive species to thrive, its speciation and population growth rates may be higher at the same time that it depresses speciation and growth rates of other species. True Falsearrow_forwardWhy are species that live at the tops of mountains at increased risk of extinction due to climate change? a. The colder temperatures at the tops of mountains gradually increase, and the species at the tops of the mountains are displaced by species at lower elevations moving up. b. The species at the tops of the mountains are adapted to moving up and down the mountains and species at lower elevations are displacing them as they move down the mountains. c. The species at the tops of the mountains are adapted to lower oxygen and climate change increases oxygen content in the air. d. Species at the tops of mountains do not have the genetic diversity for adaptation that lower-elevational species do. Therefore species at the tops of the mountains are more likely to go extinct.arrow_forwardBob Davison describes the Endangered Species Act (ESA) as an effective tool for conserving biological diversity. What is his rationale for the value of focusing on individual species? The public is not concerned about the economic costs of individual species recovery. A focus on individual species is cheaper than protecting entire ecosystems. Establishing public empathy for charismatic species provides an opportunity to educate people about lesser-known species. The public tends to value intact ecosystems over particular plant and animal species.arrow_forward
- 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_forwardThe brown tree snake is native in areas such as Australia and eastern Indonesia. In those ecosystems, the brown tree snake is not causing the decline of bird or tree populations. So what makes this same species damaging in Guam? Identify some characteristics a species may possess that would fuel its ability to cause ecological damage, as the brown tree snake has in Guam. Provide some reasoning for why you chose these characteristics.arrow_forwardIdentify 4 characteristics of a species that cause them to be vulnerable to extinction. Just the characteristic is acceptable.arrow_forward
- We (humans) do not have any ethical burden to worry about other species because extinction is a natural process. True or False?arrow_forwardHow does protecting the biodiversity of an area increases the survival of a species’ population? Use the principles of threats to biodiversity (e.g. overexploitation, habitat loss, invasive species, etc.), species dominance or evenness, and genetics of the species (e.g. inbreeding, mutations, founder effect bottlenecks, etc.). Use a Philippine endemic species as an example in your answer.arrow_forwardWhat is the importance of endemic hotspots to biodiversity conservation? A. Endemic hotspots contain many species found nowhere else, so the conservation of a small amount of area will protect many species. B. Endemic hotspots have the highest species diversity, so their conservation will protect the most species. C. Endemic hotspots are those that contain species vital to human existence, ssuch as medicinal species, and therefore humans rely on these areas the most. D. Endemic hotspots are where speciation rates are thegreatest, so the conservation of those areas will likely lead to the formation of many species in the future. E. Endemic hotspots have very low ecosystem stability, therefore require more protections to avoid extiction.arrow_forward
- Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning