Abstract
Summary Males and females of two syntopic phytophagous fly species (0. nitens and O. ferruginea, Diptera: Richardiidae) compete over small ephemeral feeding territories. We assessed fight frequency of both sexes of two species in the wild, and the simultaneous effects of potential fight asymmetries, sex and species, on the outcome of territorial contests in relation with resident status. Our results showed that residents won most of the fights, although the proportion of fights won by the resident depended on the sex of the resident, the interaction between the sex of the resident and size, and the year. Furthermore, even though some combinations of species and sex categories could be found on the same tree more than expected by chance, this did not imply a significantly high fight frequency for such combinations.
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