Changes in the faunal composition of two thermal streams near 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 abstraction 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. © Crown 1985.