The study looked at how having more species in an ecosystem affects how stable the amount of plant or algae growth is over time. They analyzed 27 experiments and found that in grasslands, having more species makes the total amount of plant growth more stable, but individual plant populations less stable. In algae communities, having more species doesn't really change how stable the total growth is. When different species grow together, their growth patterns are less synchronized compared to when they grow alone. Surprisingly, how well a species does in different environments on its own doesn't predict how much diversity helps stabilize the ecosystem. Overall, having more species can make an ecosystem's total growth more stable.