BEHAVIORAL-DIFFERENCES BETWEEN ENALLAGMA SPECIES (ODONATA) INFLUENCING DIFFERENTIAL VULNERABILITY TO PREDATORS

Enallagma species from fishless lakes walked in rapid bursts of 2-3 s and frequently performed a conspicuous behavioral display, while Enallagma species from lakes containing fish walked very slowly for durations of 20-30 s and almost never performed the conspicuous display. Species from lakes containing fish also swam for longer durations and remained motionless longer following swims. Species from fishless lakes also greatly reduced their movement and responsiveness toward prey and increased the duration of motionless periods in the presence of dragonflies, but only reduced the number and duration of the conspicuous display in the presence of fish. Species from lakes containing fish reduced their movement and responsiveness towards prey and increased the duration of motionless periods in the presence of both fish and dragonflies. -from Author