Distinguish Species Richness from Evenness - Practice 1

Species richness counts distinct species present.

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Species richness counts distinct species present. Evenness describes how individuals are distributed among them. Equal richness does not imply equal composition or evenness, and neither alone is a complete ecosystem assessment. These communities are fictional.

Worked example

Counts A: 10, 10, 10 and B: 28, 1, 1 both represent three species; A has more even abundances.

Would you believe it?

At dynamic chemical equilibrium, forward and reverse reactions can keep happening at equal rates. No net change does not mean every molecule stops reacting.

Question 1 Fictional community A has species counts 4, 4, 4. Community B has 10, 1, 1 for the same three species. Which statement is correct? Richness is equal; A is more even. B has greater richness because one count is larger. The distributions are equally even.

Question 2 Fictional community A has species counts 5, 5, 5. Community B has 13, 1, 1 for the same three species. Which statement is correct? B has greater richness because one count is larger. The distributions are equally even. Richness is equal; A is more even.

Question 3 Fictional community A has species counts 6, 6, 6. Community B has 16, 1, 1 for the same three species. Which statement is correct? The distributions are equally even. Richness is equal; A is more even. B has greater richness because one count is larger.

Question 4 Fictional community A has species counts 7, 7, 7. Community B has 19, 1, 1 for the same three species. Which statement is correct? Richness is equal; A is more even. B has greater richness because one count is larger. The distributions are equally even.

Question 5 Fictional community A has species counts 8, 8, 8. Community B has 22, 1, 1 for the same three species. Which statement is correct? B has greater richness because one count is larger. The distributions are equally even. Richness is equal; A is more even.

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