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Samples in periodicals archive:
in natural populations of western mosquitofish, the operational sex ratio commonly ranges from 1:1 to 1:6 (Krumholz, 1948).
Male, Female, therefore, reads quite a bit differently from some of the more well-known works of evolutionary psychology which stress ultimate mechanisms, sometimes to the virtual exclusion of serious considerations of proximate mechanisms--including emotion and motivation, hormonal fluctuation, cultural differences, sex roles and ideology, and historical/demographic factors such as the operational sex ratio.