Potential Causes of Vacant Niches
Vacant niches could potentially have several causes.
• Radical disturbances in a habitat: For example, droughts or forest fires can destroy a flora and fauna partially or completely. However, in such cases species suitable for the habitat usually survive in the neighbourhood and colonize the vacated niches, leading to a relatively fast re-establishment of the original conditions.
• Radical and long-lasting changes in the environment: such as ice ages.
• Evolutionary contingencies: suitable species did not evolve for usually unknown reasons, or niche segregation between pre-existing species created a novel niche vacancy.
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