Differential predation rates have been inferred as agents driving possible tertiary sex ratio changes. An example is the strong female-biased sex ratio in populations of the polygynous great-tailed grackle (Quiscalus mexicanus), which seems to be the result ofheavier predation pressure on the larger, more showy male. Similar consumer-driven sex ratios exist even in plant populations: possible sex-related differences in herbivory rate have been reported for a desert shrub (Atriplex canescens) where females were more common than males in fenced compared to grazed areas.
See also: Mating Systems.
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