Distribution and abundance of larval Coquillettidia perturbans in a Florida freshwater marsh.

All instars of larval Coquillettidia perturbans were found in the same habitats, but early instar larvae were more aggregated than later instars. Larvae were most numerous in areas dominated by arrow-arum (Peltandra virginica) and maidencane (Panicum hemitomon), less so in areas dominated by sedges (Carex spp.) and miscellaneous mixed vegetation, and least abundant in pickerelweed (Pontederia cordata) areas. Larvae were uncommon in open water or in areas dominated by small floating plants such as water fern (Salvinia rotundifolia), duckweekd (Lemna minor) and mosquito fern (Azolla caroliniana). Larval concentrations were greatest in water 35-70 cm deep. There was also a tendency for them to concentrate in areas beyond 25 m from shore. Larvae were log-normally distributed in favorable sites and became progressively more aggregated as sites became less favorable.