Correct Option
The correct option is 2 only
Explanation
1 only
stable biological community is characterized by its ability to maintain equilibrium despite environmental fluctuations. According to ecological principles, particularly those highlighted by David Tilman’s long-term ecosystem experiments, stability is linked to consistency in productivity, resilience to disturbances, and resistance to invasions.Statement-wise Analysis
- Statement 1 is Incorrect:
1 only
stable community should not show too much variation in productivity from year to year. Low inter-annual variation in biomass or productivity indicates that the ecosystem functions are consistent and reliable over time. - Statement 2 is Correct: Stability implies resilience.
1 only
stable community must be either resistant to occasional disturbances (natural or man-made) or resilient enough to recover after such disturbances. An inability to recover indicates instability. - Statement 3 is Incorrect:
1 only
stable community is characterized by its resistance to invasions by alien or exotic species. High susceptibility to such invasions suggests that the community lacks the robustness or niche occupation required to prevent new species from disrupting the existing balance.
Key Takeaway
Key Takeaway: The three main attributes of a stable biological community are constant productivity (low variation), resilience (recovery from disturbance), and resistance to invasive species.