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"Stability of a community depends on its...

"Stability of a community depends on its species richness." Write how did David Tilman show this experimentally.

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Ecologists believe that commnities with more species tend to be more stable than those with less species. This was confirmed by David Tilman experimentally who showed that :
(i) Productivity should not vary too much from year to year.
(ii) It should be resistant to occasional natural and man-made disturbances.
(iii) It should be resistant to invasions by alien species.
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