Which statement best defines disruption in an ecological context?

• A. A change in environmental conditions that temporarily improves ecosystems.
• B. A temporary or long-term change in environmental conditions causing severe impacts on ecosystems.
• C. A random climatic event with no long-term effects.
• D. A shift in soil composition due to liming.

Answer: (B)

Disruption in an ecosystem means a change in environmental conditions that can be temporary or long-lasting and that leads to significant effects on the living things and processes there. Such disturbances can come from natural events like wildfires, droughts, floods, storms, or volcanic eruptions, or from human actions like pollution or habitat destruction. Because these changes alter resources, habitats, or species interactions, they can shift which species are present, how energy and nutrients flow through the system, and how ecosystems recover. Some disruptions trigger ecological succession and may lead to a new stable state, while others may allow a quick return to the original conditions if the system is resilient. The important point is that disruption involves a notable change in conditions that has serious impacts, not a minor fluctuation or an improvement. Soil liming, for example, is a specific management practice, not a disturbance to the ecosystem.