Which of the following is not a feature of a stable ecosystem?

A stable community does not show too much variation in productivity from year to year. Communities with more species, generally, tend to be more stable than those with fewer species. A stable community must be either resistant or resilient to occasional disturbances, and it must also be resistant to invasions by alien species. A food web with more linkages increases the stability of the ecosystem as it provides alternate pathways for energy flow.