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Differences have been demonstrated in body size and reproductive periods of sympatric and allopatric populations of the isopods Sphaeroma hookeri Leach and S. rugicauda Leach. S. mgicauda is bigger and S. hookeri smaller in sympatry than in allopatry. This results partly from a divergent displacement of the life cycles of these annual isopods, and partly from a divergent displacement of the size of the molt stages. Special attention has been given to the borders between allopatr~c and sympatric populations, where isopod size IS intermed.iate between that of the neigboring populatjons.

Character Displacement in Sphaeroma spp. (Isopoda: Crustacea). I. Field Evidence