The distribution of the percentage of the body of male guppies Poecilia reticulata covered with orange coloration influenced alternative mating tactics. At 15% mean coverage, male guppies interfered with other courting males more and engaged in courtship activities longer than males with 10% mean coverage. When males were tested in a situation with a wide variety of male types, males switched among females less frequently than when the variance among males was low.2000 The Fisheries Society of the British Isles
The opportunity for sexual selection was greater when the operational sex ratio (OSR) in guppies Poecilia reticulata was biased towards males. This could be due to an increase in both male-male competition and female mate choice under male-biased OSR. 2000 The Fisheries Society of the British Isles
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