New Zealand Journal of Marine and Freshwater Research abstracts

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Distribution and production of Chironomus in eutrophic Lake Ngapouri

D. J. FORSYTH

Taupo Research Laboratory
Division of Marine and Freshwater Science
Department of Scientific and Industrial Research
P. O. Box 415, Taupo
New Zealand

Abstract The fauna of Lake Ngapouri, North Island, New Zealand, was dominated by two chi-ronomid species - Chironomus zealandkus 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. zealandkus was more tolerant of low oxygen conditions, hence its dominance in deeper water. C. zealandkus produced three generations and Chironomus sp. a two generations annually. Annual production of C. zealandkus (120.7 g DW irr²) was 4 times that of Chironomus sp. a (30.7 g DW irr²) but pro-duction:biomass ratios of the two species were similar and comparable with those obtained from most other studies of Chironomus.

Keywords Chironomus; Chironomidae; population dynamics; production; larval migration; Lake Ngapouri; temperature; dissolved oxygen; biomass; distribution

New Zealand Journal of Marine and Freshwater Research, 1986, Vol. 20 : 47-54 Received 4 April 1985; accepted 1 July 1985

PDF file of entire paper: medium quality (542K); (scanned from paper original: notes about this process)

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