Abstract
Three types of double crosses were carried out to investigate sperm competition in the grasshopper Eyprepocnemis plorans. Maximum likelihood estimation of paternity probability showed a high degree of second male sperm precedence (P2 = 90%). The results also showed that: (i) a single copulation may be enough for an efficient paternity displacement; (ii) males do not use sperm plugs, but they mate for a prolonged period of time to resist further copulation; and (iii) successive paternity displacements may be seen in the same female. The mechanisms controlling sperm competition in E. plorans, and the evolutionary implications of this phenomenon are discussed
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