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#facilitation model

2 public questions tagged with this topic.

ECOLOGICAL SUCCESSION

The model where early colonizers have no effect on later species is:

In the tolerance model, early colonists have little direct effect on recruitment of later species. Different species may enter the site, but those able to tolerate progressively lower resources or altered conditions survive and eventually dominate; replacement does not require facilitation by pioneers. Classical succession terminology divides community development into site exposure, arrival, establishment, interaction, environmental reaction, and relative stabilization. Modern ecology treats these as useful descriptions rather than a rigid deterministic program. Local resource conditions, dis

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 20

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SUCCESSION

What’s true about facilitation model of succession?

The facilitation model proposes that early colonists make an initially harsh environment more suitable for species that arrive later. Pioneers may stabilize substrate, weather rock, add organic matter or nitrogen, retain water, moderate temperature, reduce wind, or provide shade. These changes allow successors to germinate and survive where they previously could not. Later species may then outcompete, overtop, or otherwise replace the pioneers, so helping successors does not imply that early species persist indefinitely. This differs from tolerance, in which later species can establish without

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 20

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