In a certain species of salmon, some adult males are extremely large whereas other adult males are very small, compared to the females. There are no intermediate-sized adult males in the population. This is probably the result of

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Disruptive selection favors individuals at both extremes of a trait, in this case, size among adult males, leading to the presence of both very large and very small males, with no intermediates.

In a Certain Species of Salmon, Some Adult Males Are