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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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The best answer so far I found is this one (see Baum and Larson 1991):

The criterion of historical genesis is applied using the concept of "selective regime," the aggregation of organismal and environmental factors that combine to determine the expected action of natural selection on actual and potential character variation.

Baum, D. A., and A. Larson. 1991. Adaptation reviewed: a phylogenetic methodology for studying character macroevolution. Systematic biology 40:1.

In this article you can find this example:

For example, the hypothesis that a given floral trait is an adaptation enhancing the efficiency of bird-pollination would be tested by scoring subject taxa as having either the selective regime "bird-pollinated" or an alternative one (e.g., "insect-pollinated").

Then, you would be able to determine part of the selective regime of the floral trait. I say part of it because it's almost impossible to know all the abiotic and biotic factors that can trigger a change in a trait variation.

Hope that helps.

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