Dispersal is notoriously difficult to measure, so its potential population consequences are often un- known. If dispersal is density-dependent, it can act in population regulation. Adult damselflies Enallagma bor- eale (Zygoptera: Coenagrionidae) raised as larvae under a range of competitive regimes were individually mea- sured and marked. Individuals that survived to repro- ductive maturity were either recovered at the natal pond or had dispersed to nearby water bodies. Dispersing indi- viduals were heavier at emergence than those returning to the natal pond to breed. Therefore, an increased prob- ability of dispersal does not appear to be a response to poor conditions in this species.
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