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Which Diets Are the Most Similar?

Complete the table below using the Sorenson’s index formula. Two of the calculations have already been done for you. Refer to the Venn diagram to complete the other calculations.

Sorenson’s index values for pairs of herbivores
Grevy's zebra Cape Buffalo Impala Dik-dik
Grevy's zebra
Cape Buffalo .42
Impala
Calculation Error
 .37
Dik-dik
Calculation Error
Calculation Error
Calculation Error

Sorenson's index formula 2 × number (no.) of shared plant species 2 × no. of shared species + no. species for animal 1 only + no. species for animal 2 only

Below is the full Venn diagram to complete the table. Alternatively, open the page with the Venn diagram data in table format

Venn Diagram showing all the plant species found in dung samples from the four herbivores. You can remove the check mark next to an animal’s name to remove the plant species unique to that animal’s diet. (Plant species in green and marked with an asterisk (*) are grasses and those shown in black are browse.) Show data in table view