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Biology Quiz: Species Richness and Diversity

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Questions and Answers

What is the value of the Shannon Diversity Index for Community 2?

0.71 (correct)
1.0
0.5
0.8

What is the formula for the Shannon Diversity Index?

H = pA ln pA + pB ln pB + pC ln pC +…
H = - (pA ln pA + pB ln pB + pC ln pC +…) (correct)
H = - (pA + pB + pC +…)
H = pA + pB + pC +…

Which of the following is a measure of the number of different species in a community?

Species dominance
Species evenness
Shannon Diversity Index
Species richness (correct)

What is the importance of biodiversity in community ecology?

It acts as a biological cover against potential disruptions caused by environmental changes (C) Signup and view all the answers

What is the value of the species richness for Community 2?

5 (C) Signup and view all the answers

Which of the following is a measure of how evenly the individuals are distributed among the species in a community?

Species evenness (A) Signup and view all the answers

What is the unit of measurement for the relative abundance of a species in a community?

Decimal (A) Signup and view all the answers

What is the primary function of the natural logarithm (ln) in the Shannon diversity index formula?

To simplify the calculation of the diversity index (A) Signup and view all the answers

Which community has a higher species diversity according to the Shannon diversity index?

Community 1 with a diversity index of 1.39 (C) Signup and view all the answers

What is the term for the variety of species in a community?

Species richness (C) Signup and view all the answers

What is the term for the distribution of individuals among species in a community?

Species evenness (C) Signup and view all the answers

What is the term for the degree to which one species dominates a community?

Species dominance (B) Signup and view all the answers

What is the species richness of Community 1?

4 species (A) Signup and view all the answers

Which community has a more even distribution of species?

Community 1 (D) Signup and view all the answers

What is the dominant species in Community 2?

Species A (A) Signup and view all the answers

What is the purpose of the Shannon diversity index (H)?

To calculate the diversity based on species richness and relative abundance (A) Signup and view all the answers

What is the formula for the Shannon diversity index (H)?

H = - (pA ln pA + pB ln pB + pC ln pC + …) (D) Signup and view all the answers

What level of biodiversity is being discussed in the passage?

Species diversity (B) Signup and view all the answers

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Study Notes

Species Diversity

Species diversity refers to the variety of species present in an ecosystem or community.
It is measured using the Shannon diversity index (H), which takes into account both species richness and relative abundance.

Shannon Diversity Index (H)

H = - (pA ln pA + pB ln pB + pC ln pC +…)
Where: p = relative abundance of each species, ln = natural logarithm

Community 1 and Community 2

Community 1: A: 25%, B: 25%, C: 25%, D: 25%
Community 2: A: 80%, B: 5%, C: 5%, D: 10%
Community 1 has a higher Shannon diversity index (H) indicating a more diverse community.

Species Richness, Evenness, and Dominance

Species richness: the number of different species present in a community.
Species evenness: the relative abundance of each species in a community.
Species dominance: the presence of a dominant species in a community.
Community 1: 4 species (A, B, C, D), even distribution, no dominant species.
Community 2: 4 species (A, B, C, D), uneven distribution, species A is dominant.

Importance of Biodiversity

Biodiversity acts as a biological cover against potential disruptions caused by environmental changes.

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