New Zealand Journal of Marine and Freshwater Research abstracts

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Changes in the faunal composition of two thermal streams near Taupo, New Zealand

M. JAMES

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

Abstract The distributions of macroinverte-brates in two thermal streams near Taupo were examined and compared with observations made in 1966. The cooling of the streams associated with ion has altered the species composition. Odonata and Trichoptera were recorded for the first time in the lower reaches of the Waipahihi Stream whereas Ephydridae and Hydrophilidae were restricted to the upper reaches at temperatures above 33.5°C. Molluscs dominated the fauna at sites with temperatures below 33.5°C in the Waipahihi and Waipuwerawera Streams. Potamopyrgus anti-podarum was present at sites with temperatures below 28°C.

Keywords thermal streams; freshwater ecology; macroinvertebrates; Hydrophilidae; Ephydridae; Mollusca; fish; abstraction

New Zealand Journal of Marine and Freshwater Research, 1985, Vol. 19: 439-443 Received 22 February 1985; accepted 28 March 1985

PDF file of entire paper: medium quality (381K); (scanned from paper original: notes about this process)

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