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How would you define Regime of selection (or Selection regime)?

In addition to a accurate definition, a developped example would be very welcome!

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I'll kick this off with an attempt at a definition: a selection regime is

the set of selective pressures on a population

As in, "alteration of selection regime resulting from harvest" (Mooney & McGraw 2007)

or "Human-induced nutrient input can change the selection regime and lead to the loss of biodiversity. For example, eutrophication caused speciation reversal in polymorphic whitefish populations through a flattening of littoral–pelagic selection gradients." (Hirsch et al 2013)

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