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

Explanation

**Step-by-Step Solution:**

1. **Introduction to David Tilman**: David Tilman is a prominent ecologist known for his research on biodiversity and its impact on ecosystem functioning. He has extensively studied the relationship between species richness and community stability.

2. **Experimental Design**: Tilman conducted long-term ecological experiments in both algal and grassland ecosystems. He created controlled plots with varying levels of species richness. This allowed him to observe the effects of biodiversity on ecosystem stability and productivity.

3. **Observation of Biomass Variance**: In his experiments, Tilman found that plots with a higher number of species exhibited lower year-to-year variance in overall biomass. This means that communities with greater species richness were more stable over time, showing less fluctuation in biomass production.

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