18 Questions
What is the value of the Shannon Diversity Index for Community 2?
0.71
What is the formula for the Shannon Diversity Index?
H = - (pA ln pA + pB ln pB + pC ln pC +…)
Which of the following is a measure of the number of different species in a community?
Species richness
What is the importance of biodiversity in community ecology?
It acts as a biological cover against potential disruptions caused by environmental changes
What is the value of the species richness for Community 2?
5
Which of the following is a measure of how evenly the individuals are distributed among the species in a community?
Species evenness
What is the unit of measurement for the relative abundance of a species in a community?
Decimal
What is the primary function of the natural logarithm (ln) in the Shannon diversity index formula?
To simplify the calculation of the diversity index
Which community has a higher species diversity according to the Shannon diversity index?
Community 1 with a diversity index of 1.39
What is the term for the variety of species in a community?
Species richness
What is the term for the distribution of individuals among species in a community?
Species evenness
What is the term for the degree to which one species dominates a community?
Species dominance
What is the species richness of Community 1?
4 species
Which community has a more even distribution of species?
Community 1
What is the dominant species in Community 2?
Species A
What is the purpose of the Shannon diversity index (H)?
To calculate the diversity based on species richness and relative abundance
What is the formula for the Shannon diversity index (H)?
H = - (pA ln pA + pB ln pB + pC ln pC + …)
What level of biodiversity is being discussed in the passage?
Species diversity
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.
Assess your understanding of species richness, evenness, and dominance in a community. This quiz covers the formulas and calculations involved in measuring biodiversity.
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