Which is NOT a type of natural disturbance event that might result in succession of new communities?

Question

BlackTom AI · Accepted Answer

Natural disturbances are events caused by natural processes that remove or alter organisms and create opportunities for ecological succession (the sequential change in species composition over time).

1) Relevant knowledge points and concepts
- Natural disturbance: an event of natural origin (e.g., storms, floods, volcanic eruptions, wildfires started by lightning) that alters ecosystems and triggers succession.
- Succession: primary succession occurs on newly formed substrates (e.g., lava flows), secondary succession follows removal of a community but where soil remains (e.g., after fire or flood).
- Anthropogenic disturbance: human-caused events (e.g., logging, land clearing) that also cause succession but are not classified as natural disturbances.

2) Step-by-step reasoning
- Examine each answer option and determine whether it is natural or human-caused, and whether it commonly triggers succession.
  a) windstorms or tornado — atmospheric events of natural origin; can uproot trees and open patches for secondary succession.
  b) severe flooding — natural hydrological event; can remove vegetation and alter soils, leading to succession.
  c) logging — deliberate human removal of trees for timber; an anthropogenic disturbance, not natural.
  d) volcanic eruption — geologic natural event; can create new rock surfaces for primary succession.
  e) wildfire — often a natural disturbance (e.g., started by lightning) that removes vegetation and initiates secondary succession.

3) Intermediate steps / evidence
- For volcanic eruption: removal of soil and exposure of bare rock → pioneer species colonize (lichens, mosses).
- For wildfire/windstorm/flood: soil often remains → grasses, shrubs, then trees reestablish via secondary succession.
- For logging: although succession can occur after logging, the cause is human activity, not a natural event.

4) Why the correct answer is correct
- Logging is the only option that is primarily an anthropogenic activity; therefore it is NOT a type of natural disturbance event. The question specifically asks for what is NOT a natural disturbance that might result in succession.

5) Why the other options are incorrect
- Windstorms/tornadoes, severe flooding, volcanic eruptions, and wildfires are all natural phenomena that can disturb ecosystems and trigger either primary or secondary succession.

6) Conclusion
- The correct answer is logging, which matches the provided answer.

Which is NOT a type of natural disturbance event that might result in succession of new communities?Single choice

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