Unit 3: Biodiversity. 2

What is species richness?

• A measure of the number of different species in a particular area

• A measure of the relative abundance of different species

• A measure of the total number of individuals in an ecosystem

• The probability that a species will be found within a single quadrat

What does species evenness measure?

• The probability of finding a species in a quadrat

• The total number of individuals in an ecosystem

• The relative abundance of different species

• The number of different species in an ecosystem

How is relative species abundance calculated?

• By determining the frequency of a species in a quadrat

• By estimating the percentage cover of a species

• By counting the number of different species in an area

• By dividing the total number of individuals of a species by the total number of individuals of all species

What is percentage cover used for?

• To estimate the abundance of plant species

• To measure the number of different species in an ecosystem

• To estimate the abundance of animal species

• To calculate the relative abundance of species

What does percentage frequency indicate?

• The number of different species in an ecosystem

• The relative abundance of different species

• The probability that a species will be found within a single quadrat

• The total number of individuals in an ecosystem

Which measure can help determine species evenness?

• Simpson’s diversity index

• Percentage frequency

• Percentage cover

• Species richness

What is the formula for calculating percentage frequency?

• (total number of individuals of a species/total number of quadrats) x 100

• (number of different species/total number of species) x 100

• (total number of individuals of a species/total number of individuals of all species) x 100

• (number of quadrats in which the species is found/total number of quadrats) x 100

Which of the following is NOT a measure used to determine species diversity?

• Species richness

• Species evenness

• Species density

• Percentage cover

What does a high species evenness indicate?

• A community dominated by one or two species

• A high number of different species

• A community with several different species having similar abundance

• A low number of different species

Which of the following is true about species richness?

• It measures the total number of individuals in an ecosystem

• It gives equal weight to all species regardless of their abundance

• It takes into account the abundance of species

• It gives more weight to species with higher abundance