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In a study comparing different plant communities (A to D) across a landscape, the following data were obtained:

Community	A	B	C	D
No. of species in the community	12	25	11	19
No. of species common to both communities
Community	A	B	C	D
A		9	8	10
B			6	14
C				7
D

Which of the following options represents the pair of communities with the highest similarity value when Sorenson’s coefficient is used?

Correct option is A

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Step 3: Determining the Highest Similarity Value

• A and C: 0.695(Highest)
• A and D: 0.645
• B and C: 0.444
• B and D: 0.636

Information Booster:

1. Sorenson’s Coefficient measures community similarity, giving higher weight to shared species.
2. It ranges between 0 (no similarity) and 1 (complete similarity).
3. More shared species = Higher similarity index.
4. Lower species richness with high overlap results in higher SSC values.
5. Used in ecological studies to compare biodiversity across different habitats.