Question

In a grassland (P), there are 8 plant species with a similar number of individuals of each species. In another grassland (Q), there are 12 species with uneven abundances. Which one of the following statements about the Shannon’s diversity index of P and Q is correct?

• A. The diversity index of P is greater than Q
• B. The diversity index of P is less than Q
• C. The diversity index of P is equal to Q
• D. There is not enough information to draw a conclusion

Hint:

For ecological studies, detailed data on species count and individual distribution is crucial for accurate biodiversity assessments.

Answer 1

The Correct Option is D

Step 1: Understand the Variables.
Shannon’s diversity index calculates biodiversity by considering both the richness (total number of different species) and evenness (how evenly the individuals are distributed among the species).

Step 2: Analyze Grassland P.
Grassland P has 8 species, all with a similar number of individuals, suggesting high evenness but lower species richness.

Step 3: Analyze Grassland Q.
Grassland Q has 12 species, suggesting higher richness. However, the individuals are unevenly distributed among these species, which could negatively impact the evenness component of the diversity index.

Step 4: Recognize Missing Data.
Without specific data on the number of individuals per species in Grassland Q, we cannot accurately compute and compare the diversity indices of P and Q.

Conclusion: A definitive comparison between the two grasslands’ diversity cannot be made without complete data on both richness and evenness for each site.