New Zealand Journal of Marine and Freshwater Research | VOL. 27
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Flow preferences of larval Chironomidae (Diptera) in Tongariro River, New Zealand

Publication Date Jun 1, 1993

Abstract

Abstract Flow preferences of five major chironomid taxa (Cricotopus, Orthocladiinae sp. a, Eukiefferiella, Tanytarsus vespertinus, and Maoridiamesa) were investigated in December 1990 at three sites in Tongariro River, central North Island, New Zealand. Exponential polynomial preference curves indicated that most taxa were found predominantly in water ≤ 0.5 m deep when data from all sites were combined (range of conditions sampled = 0.1–1.5 m). Cricotopus and Orthocladiinae sp. a appeared to have broad velocity preferences over the range sampled (0.1–1.8 m s−1 ). In contrast, T. vespertinus had a velocity optimum of 0.1 m s−1, and Maoridiamesa had an optimum > 1.0 m s−1 at all sites. Abundances of Eukiefferiella were greatest over an intermediate range of velocity conditions (0.7–1.5 m s−1 ). Mechanisms leading to differences in velocity optima amongst chironomid taxa may include differential oxygen requirements, and changes in food supply. When determining optimal minimum flows for benthic chironomid com...

Concepts

Tongariro River Central North Island Chironomid Taxa Benthic Com Food Supply Differential Requirements Optimal Flows Exponential Curves Range Of Velocity Conditions Benthic Chironomid

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