Succession · Botany

Which of the following represents an abiotic factor that could trigger allogenic succession?

  1. Gradual buildup of leaf litter on the forest floor
  2. Shading of the forest understory by canopy trees
  3. A shift in river course with new sediment deposits
  4. Nitrogen fixation carried out by root-nodule legumes
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Correct answer: A shift in river course with new sediment deposits

Allogenic succession is caused by external physical or chemical changes in the environment. Sediment deposition by a river is a geological/physical process independent of the local biological community.

Difficulty: Medium Question 16 of 20

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