The figure shows three species of beetles (A, B, C) that live on an island together. Which of the following descriptions of the beetle populations is most likely given the data? VARIATION IN POPULATION DENSITY OF BEETLES 40T 35 30 - Species A - Species B Species C 25 20 15 10 5+ 1964 1974 1984 Year 1994 2004 O a. Species A and B are in direct competition with each other O b. Species C is outcompeted by species B by 2004 O c. Species A and C both invaded the island in 1964 O d. Species B is outcompeted by species C by 2004 Population Density (beetles/m)

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Chapter54: Community Ecology
Section: Chapter Questions
Problem 4TYU: The tendency for two similar species to differ from each other more markedly in areas where they...
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The figure shows three species of beetles (A, B, C) that live on an island together. Which of the following descriptions of the beetle
populations is most likely given the data?
VARIATION IN POPULATION DENSITY OF BEETLES
40
35
30
- Species A
Species B
Species C
15
10
1964 1974
1984
Year
1994
2004
a. Species A and B are in direct competition with each other
O b. Species C is outcompeted by species B by 2004
O c. Species A and C both invaded the island in 1964
O d. Species B is outcompeted by species C by 2004
Population Density
Transcribed Image Text:The figure shows three species of beetles (A, B, C) that live on an island together. Which of the following descriptions of the beetle populations is most likely given the data? VARIATION IN POPULATION DENSITY OF BEETLES 40 35 30 - Species A Species B Species C 15 10 1964 1974 1984 Year 1994 2004 a. Species A and B are in direct competition with each other O b. Species C is outcompeted by species B by 2004 O c. Species A and C both invaded the island in 1964 O d. Species B is outcompeted by species C by 2004 Population Density
Two barnacle species, Chthamalus and Balanus, live in intertidal habitat. Two distributions are shown, (A) is shown by dashed lines and (B) is
shown with solid lines. Which of the following statements is correct?
High tide
Chthamalus
Balanus
B.
O a
The distributions shown by the solid lines (B) indicate where Chthamalus and Balanus exist in the absence of competition
O b
The distributions shown by the dashed lines (A) indicates where Chthamalus and Balanus exist in the presence of competition
Balanus has a smaller distribution in the presence of competition because it is a poorer competitor in the high intertidal zone
O d
Chthamalus has a smaller distribution in the presence of competition because it is a poorer competitor in the low intertidal zone
Transcribed Image Text:Two barnacle species, Chthamalus and Balanus, live in intertidal habitat. Two distributions are shown, (A) is shown by dashed lines and (B) is shown with solid lines. Which of the following statements is correct? High tide Chthamalus Balanus B. O a The distributions shown by the solid lines (B) indicate where Chthamalus and Balanus exist in the absence of competition O b The distributions shown by the dashed lines (A) indicates where Chthamalus and Balanus exist in the presence of competition Balanus has a smaller distribution in the presence of competition because it is a poorer competitor in the high intertidal zone O d Chthamalus has a smaller distribution in the presence of competition because it is a poorer competitor in the low intertidal zone
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