Question:
The graph shows the rank-abundance relationships for species in three communities, \(P\), \(Q\), and \(R\).
\includegraphics[width=0.5\linewidth]{47.png}
Which one of the following statements is true with respect to the evenness of the three communities?
The graph shows the rank-abundance relationships for species in three communities, \(P\), \(Q\), and \(R\).
\includegraphics[width=0.5\linewidth]{47.png}
Which one of the following statements is true with respect to the evenness of the three communities?
Which one of the following statements is true with respect to the evenness of the three communities?
Show Hint
To interpret rank-abundance curves:
1. Shallow slopes indicate higher evenness.
2. Steep slopes suggest dominance by a few species, leading to lower evenness.
3. Compare slopes visually to rank communities by evenness.
2. Steep slopes suggest dominance by a few species, leading to lower evenness.
3. Compare slopes visually to rank communities by evenness.
Updated On: Jan 24, 2025
- \(P > Q > R\)
- \(Q > P > R\)
- \(R > Q > P\)
- \(R > P > Q\)
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The Correct Option is C
Solution and Explanation
Step 1: Understand rank-abundance relationships.
The slope of the rank-abundance curve indicates the evenness of a community:
A shallower slope represents greater evenness, as species abundances are more evenly distributed.
A steeper slope indicates lower evenness, as a few species dominate the community.
Step 2: Analyze the graph. Community \(P\): This has the steepest slope, indicating the least evenness. Community \(Q\): This has a moderate slope, indicating intermediate evenness. Community \(R\): This has the shallowest slope, indicating the highest evenness. Step 3: Compare evenness among the communities. The evenness order based on the slopes is: \[ R > Q > P \] Step 4: Evaluate the options. Option (A): Incorrect. It suggests \(P\) has the highest evenness, which contradicts the steep slope of its curve. Option (B): Incorrect. It suggests \(Q\) has the highest evenness, but \(R\) has a shallower slope. Option (C): Correct. This matches the observed order \(R > Q > P\). Option (D): Incorrect. It misplaces \(P\) as having higher evenness than \(Q\).
A steeper slope indicates lower evenness, as a few species dominate the community.
Step 2: Analyze the graph. Community \(P\): This has the steepest slope, indicating the least evenness. Community \(Q\): This has a moderate slope, indicating intermediate evenness. Community \(R\): This has the shallowest slope, indicating the highest evenness. Step 3: Compare evenness among the communities. The evenness order based on the slopes is: \[ R > Q > P \] Step 4: Evaluate the options. Option (A): Incorrect. It suggests \(P\) has the highest evenness, which contradicts the steep slope of its curve. Option (B): Incorrect. It suggests \(Q\) has the highest evenness, but \(R\) has a shallower slope. Option (C): Correct. This matches the observed order \(R > Q > P\). Option (D): Incorrect. It misplaces \(P\) as having higher evenness than \(Q\).
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