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NEETBotanyBiodiversity and its Conservation

What is the main goal of a stable community?

Options

  1. ATo show variation in productivity
  2. BTo be resistant to disturbances and invasions by alien species
  3. CTo have a high species richness
  4. DTo understand the link between species richness and ecosystem health

Correct answer

B. To be resistant to disturbances and invasions by alien species

Step-by-step solution

A stable community should not show too much variation in productivity from year to year; it must be either resistant or resilient to occasional disturbances (natural or man-made), and it must also be resistant to invasions by alien species. We don’t know how these attributes are linked to species richness in a community, but David Tilman’s long-term ecosystem experiments using outdoor plots provide some tentative answers. Tilman found that plots with more species showed less year-to-year variation in total biomass.

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