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Biodiversity

Biodiversity. Jigsaw activity – share your info. Species Diversity. The variety of species per unit area. This includes both the number of species present and their relative abundance. Genetic Diversity. The range of genetic material present in a gene pool or population of a species.

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Biodiversity

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  1. Biodiversity

  2. Jigsaw activity – share your info

  3. Species Diversity • The variety of species per unit area. This includes both the number of species present and their relative abundance.

  4. Genetic Diversity • The range of genetic material present in a gene pool or population of a species.

  5. Habitat Diversity • The range of different habitats or number of ecological niches per unit area in an ecosystem, community or biome.

  6. Check understanding • Are species with a high or a low genetic diversity more prone to extinction and why? Think about what would happen if the environment changes. • How could we increase the genetic diversity of an area? • How could we increase habitat diversity? • How could we increase species diversity? • As an environmentalist, which of the three methods of increasing biodiversity will be the most successful and why? • How could we measure biodiversity in any given area?

  7. Measuring diversity? Which ones… • Quadrat • Lincoln • Simpson’s - how does it work? PAIRS

  8. Communities with individuals evenly distributed between different species are said to have high evenness and have high diversity. This is because many species can co-exist in the many available niches within a complex ecosystem. • Communities with one dominant species have a low diversity which shows a poorer ecosystem not able to support as many types of organism. • Measures of diversity in communities with few species can be unreliable as relative abundance between species can misrepresent true patterns.

  9. 4.1.1 Define the terms biodiversity, genetic diversity, species diversity and habitat diversity.

  10. So, why conserve species?

  11. 1a) Identify, giving reasons, two actions which will promote species diversity. (2) 1b) Explain why species diversity is considered to be an advantage to an ecosystem. (3)

  12. IB questions: 1. Distinguish between the term biodiversity and abundance. 2. How can species diversity in an area be measured? 3. Discuss the characteristics of an ecosystem that would allow it to support high biodiversity and explain what the threats are to this ecosystem.

  13. Are humans still evolving?

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