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Definition of “Niche Complementarity”

What does "Niche Complementarity" means? On this website they define "Niche Complementarity" as: The tendency for coexisting species which occupy a similar position along one niche dimension ...
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Standardized Selection Ratio (SSR)

In this article the athors used the Standardized Selection Ratio (SSR) in order to infer what is the preferred host (anemone) of anemonefish. Here is a quotation coming from their methods: ...
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Index of ecological niche overlap

For this question I am interested in the Pianka's Index of ecological niche overlap. What is the Pianka's Index? How does it work? How can one calculate this index? How often is it used? In what ...