Distribution and production ofChironomusin eutrophic Lake Ngapouri

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Abstract
The fauna of Lake Ngapouri, North Island, New Zealand, was dominated by two chi‐ronomid species — Chironomus zealandicus in the profundal zone and Chironomus sp. a in the littoral zone. Their distribution and production was most influenced by seasonal changes in water temperature and dissolved oxygen concentration. C. zealandicus was more tolerant of low oxygen conditions, hence its dominance in deeper water. C. zealandicus produced three generations and Chironomus sp. a two generations annually. Annual production of C. zealandicus (120.7 g DWm‐2) was 4 times that of Chironomus sp. a (30.7 g DW m‐2) but pro‐ductionrbiomass ratios of the two species were similar and comparable with those obtained from most other studies of Chironomus.