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- W2334209957 abstract "-The mating system of the freshwater amphipod Hyalella azteca consists of precopulatory mate guarding, in which males compete for the possession of females by guarding them before copulation. Although males in the field population are on average significantly heavier than females, males in precopula are not proportionately heavier than the females they carry, indicating that precopulatory mate guarding takes place in a nonsize assortative manner. In the laboratory, the guarding pattern and pairing success are dependent upon the operational sex ratio (OSR). When the OSR is female-biased, males are more successful at obtaining females due to the active male mate choice, but when OSR is malebiased, females are less frequently taken into precopula because of intensified male-male interference. At female/male OSR values of 1:2 or 2:1, males demonstrate a preference for large prospective mates. However, at the OSR values of 1:3 or 3:1, pairs are randomly formed with no size-dependent responses. This flexibility of guarding behavior is explained by time and energy investment tactics in mate selection by both sexes." @default.
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- W2334209957 date "1993-01-01" @default.
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- W2334209957 title "Sexual Dimorphism and Mate Choice in Hyalella azteca (Amphipoda)" @default.
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- W2334209957 doi "https://doi.org/10.2307/2426444" @default.
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