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The Development of Species: Evolution and Classification

Measuring biodiversity and genetic diversity

  • 3 things to know
  • Components 01, 02 and 03

Overview

Recall questions on genetic, species and ecosystem biodiversity, species richness and evenness, calculating and interpreting Simpson's Index of Diversity, D = 1 − Σ(n/N)², why diverse habitats are more stable, and the proportion of polymorphic gene loci as a measure of genetic diversity.

What you need to know

Answer each one before you reveal it.

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Key term

What is genetic biodiversity?

Key term

What is species biodiversity?

Key term

What is ecosystem biodiversity?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Define biodiversity.

    Model answer

    Biodiversity is the variety of living organisms in an area, and it can be considered at the genetic, the species and the ecosystem level.

  2. 2

    What is genetic biodiversity?

    Model answer

    Genetic biodiversity is the variety of different alleles present in the gene pool of a population or a species.

  3. 3

    What is species biodiversity?

    Model answer

    Species biodiversity is the number of different species present in a habitat together with the relative abundance of each of them.

  4. 4

    What is ecosystem biodiversity?

    Model answer

    Ecosystem biodiversity is the range of different habitats and ecosystems found within a region.

  5. 5

    Distinguish between species richness and species evenness.

    Model answer

    Species richness is the number of different species present, whereas species evenness is how equally the individuals are shared out between those species.

  6. 6

    Why is species richness on its own a poor measure of diversity?

    Model answer

    A community dominated by one abundant species can have the same richness as one in which all species are equally common, yet it is far less diverse and less stable.

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