A species of louse (an external parasite) infests salmon. Researchers have found that the lice have difficulty finding a mate when there are only a few lice on an individual fish. The lice find mates more easily and produce more offspring when there are many lice on an individual fish. This is an example of

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This is an example of positive density-dependent population regulation because the lice find mates more easily and produce more offspring when there are many lice on an individual fish. As the density of the lice population increases, their reproductive success also increases, resulting in a positive relationship between population density and population growth rates.

A Species of Louse (An External Parasite) Infests Salmon