Precopulatory mate guarding in crustaceans is a common male mating strategy when female receptivity for copulation is short. The decision to start guarding is not made by only males, however; it is commonly found that females resist the guarding attempts of males. Furthermore, experimental data show that males aimfor longerguarding durations thanfemales allow. Shorter guarding durations may befavored females by because of a number ofpotential costs ofguarding. Precopulatory guarding therefore presents a model case of intersexual conflict where the fitness- maximizing strategies of males andfemales differ. When the interests of the sexes are in conflict, the actual guarding duration may be a compromise between male and female optima, resulting from the adjustment of contest behavior to thefitness gains of winning and to thefzghting abilities of the parties. Intersexual conflicts are also likely to generate sexual selection on male andfemale traits related to the outcome of the contests.
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