Ecological Niches & Species Competition
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Questions and Answers

Which of the following is an example of competitive exclusion?

  • The adaptation of gray squirrels to the environment
  • The growth of Paramecium aurelia and Paramecium caudatum individually
  • The replacement of red squirrels by gray squirrels in Britain (correct)
  • The coexistence of two species in the same niche

    • Which of the following is true about obligate aerobes?

  • They require continuous oxygen supply (correct)
  • They can live in either oxic or anoxic environments
  • They are inhibited or killed by oxygen
  • They can use oxygen if available

    • Which of the following is true about obligate anaerobes?

  • They can live in either oxic or anoxic environments
  • They can use oxygen if available
  • They are inhibited or killed by oxygen (correct)
  • They require continuous oxygen supply

    • Which of the following is true about facultative anaerobes?

    <p>They can use oxygen if available</p> Signup and view all the answers

    What is the term used to describe the process by which natural selection drives competing species into different patterns of resource use or different niches?

    <p>Spatial niche partitioning</p> Signup and view all the answers

    Which of the following best describes a fundamental niche?

    <p>The resources and habitat that the species could theoretically use</p> Signup and view all the answers

    Which of the following best describes a realized niche?

    <p>The resources and habitat that the species is actually able to use</p> Signup and view all the answers

    Why can only one species occupy a niche at a specific time?

    <p>Because of interspecific competition</p> Signup and view all the answers

    What is an advantage of occupying a very specific niche?

    <p>Encountering less interspecific competition</p> Signup and view all the answers

    Which of the following is an example of a specialist species?

    <p>Koalas</p> Signup and view all the answers

    Which species was identified as a keystone predator in Robert Paine's study at Mukkaw Bay?

    <p>Starfish</p> Signup and view all the answers

    What happened to the barnacle, Balanus glandula, after the removal of the starfish in Paine's study?

    <p>It was replaced by another barnacle species</p> Signup and view all the answers

    What effect did the removal of the starfish have on species diversity in the study area?

    <p>Species diversity significantly decreased</p> Signup and view all the answers

    What role do sea otters play in maintaining balance in the ecosystem?

    <p>They regulate sea urchin populations</p> Signup and view all the answers

    What is the term used for species that provide habitat for a variety of other species?

    <p>Keystone hosts</p> Signup and view all the answers

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