Why there are so many definitions of fitness in models.

Abstract excerpt

Evolutionary "fitness" is operationalized in many different ways in models. Its role is to quantify that which is favored by natural selection. Generally, short-term ability to survive and reproduce (e.g. expected number of surviving offspring) is assigned to genotypes or phenotypes and used to non-trivially derive longer-term quantities (e.g. invasion rate or fixation probability) that provide insight as to...

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