Multiple answer multiple choice, 4 pts. The population persistence niche concept is quantitative and multidimensional • focuses on what members of a population do in a given locality • is difficult to measure • was put forward by Chase and Leibold
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This concept is related to how populations survive and thrive in their environments, considering various factors that influence their persistence. Show more…
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Question 3: Part A: Which of the following studies demonstrated that migration can greatly influence the genetic structure of a population or deme (2 pts.)? A. Sanjak et al.'s (2018) study of puberty in English women B. Clark and Shepard's (1959) study of African swallowtail butterflies C. Haag et al.'s (2005) study of the Glanville fritillary D. Hubbell and Johnson's (1977) study of stingless bees E. Grant and Grant's (1992) study of Darwin's finches Part B: Loggerhead sea turtles are an endangered species. According to an analysis of their life tables and other studies mentioned in class, the following is TRUE about this species (2 pts.): A. Increasing egg/hatchling survivorship to 100% has almost no effect on r B. The estimated value of r for this species is greater than zero C. The life stage that has the largest effect on population growth is the mature adult stage D. After the federal government began requiring commercial fishing boats to use TEDs, the population of loggerhead turtles has shown signs of recovery E. All of the above are true Part C: Which of the following is an INCORRECT statement about genetic drift (2 pts.)? A. Relative to the mainland, island populations are more likely to exhibit drift effects. B. Genetic drift was demonstrated in the study of fruit flies by Peter Buri (1954) C. Endangered species are particularly sensitive to genetic drift. D. In small populations, genetic drift is expected to increase heterozygosity or allelic diversity. E. None of the above. All statements are correct. Part D: The study by Tansley in 1917 on the bedstraw Galium was of monumental significance to the field of ecology because it (2 pts.): A. demonstrated that competition is habitat dependent B. was the first experimental field study to document interspecific competition C. demonstrated that current species distributions may be due to competition in the past D. all of the above E. none of the above.
Sri K.
Madhur L.
1) Which of the following contributes to a realized niche? Select one or more: a. dispersal ability b. disease and parasitism susceptibility c. predation d. the fundamental niche characteristics e. competitive pressures 2) What is a niche envelope (fundamental niche)? a. the range of a species described by the overlapping regions that are within an optimal range of physical attributes for the species (like optimal temperature and water ranges) b. the temperature and water regions for a species c. the range of a species based on the competitive abilities relative to other species in that area. d. an area that the species is protected in e. something in which to mail a niche letter 3) Why is humidity important in the formation of a biome? Select one or more: a. humidity prevents desiccation b. water acts as a temperature buffer c. it can change the temperature in an ecosystem d. it can come from plant transpiration e. it can condense and precipitate as rainfall 4) Why are glaciers important in biome formation? Select one or more: a. They create mountain slopes and valleys which affect temperature and water movement. b. They distribute plants and animals long distances which means these organisms are dispersed further than normal. c. The valleys are U-shaped rather than V-shaped which looks really different d. They distribute minerals long distances which means that certain minerals are found far away from their source. e. They change the substrate and therefore the permeability of water into that substrate 5) What are the two factors that determine whether an organism is present or absent in a given region? Select one or more: a. the ability of that organism to disperse b. whether that organism is terrestrial or aquatic c. the ability of the organism to problem solve d. the fecundity of the organism e. the limitations of the organism to specific physical environments 6) Which of the following is considered part of an organisms "environment"? Select one or more: a. prey b. other members of the same species (conspecifics) c. predators d. bacteria, viruses, and parasites e. abiotic elements (rocks, substrate, water) 7) Which of the following is NOT true regarding sink populations? a. They are often maintained by source population replenishment b. There is usually an arrow pointing towards these patches but rarely away from these patches. c. They tend to show negative population growth (population decline) d. They are unaffected by changing environmental conditions e. They often go extinct.
Suman K.
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