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Levels of Biodiversity

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Genetic diversity - definition

  • Genetic diversity within a population refers to the number of different alleles (the alternate forms of genes) of all genes and the frequency with which they appear.

Species diversity - definition

  • Species diversity refers to the variety of species within a region.

Ecological diversity - definition

  • Ecosystem diversity refers to the variety of ecosystems in a given place.

Importance of species diversity to ecosystem - definition

  • Ecologists believe that communities with more species tend to be more stable than those with less species.
Attributes of a stable community-
1. It shall not show too much of variations in the year-to-year productivity.
2. It must be either resistant or resilient to seasonal disturbances.
3. It must be resistant also to alien species.
Feature of David Tilmans ecology experiments-
1. The plots with more species showed less year-to-year variation in the total biomass.
2. Plots with increased diversity showed higher productivity.

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