New Zealand Journal of Marine and Freshwater Research abstracts
Life history of Kaniwhaniwhanus chapmani Boothroyd (Chironomidae:
Orthocladiinae): population dynamics, emergence, and drift
I. K. G. BOOTHROYD*
Department of Biological Sciences
University of Waikato
Private Bag 3105
Hamilton, New Zealand
*Present address: National Institute of Water & Atmospheric
Research Ltd, P. O. Box 11 115, Hamilton, New Zealand. email:
i.boothroyd@niwa.cri.nz
Abstract The life history of Kaniwhaniwhanus chapmani
Boothroyd is described through examination of larval population dynamics,
larval drift, and adult emergence. Development of larvae occurred all year but
peak larval densities occurred in February, July, and November and indicated
several generations with longest generation times in the autumn. Emergence
occurred all year and a bimodal diel emergence pattern was apparent at certain
times. K. chapmani larvae were present in the stream drift at all times
but not in high densities, and generally only during daylight hours with an
early morning/late afternoon drift pattern. K. chapmani exhibits a
generally non-seasonal life history but rapid growth tends to occur when
conditions of temperature and food quality are likely to be optimal resulting
in shorter generation times and peaks in larval populations.
Keywords Chironomidae; Orthocladiinae; Diptera; life history;
drift; emergence; population dynamics; Kaniwhaniwhanus; streams;
benthos; macroinvertebrates
M98018
Received 5 May 1998; accepted 30 October 1998
PDF file of entire paper: medium quality (636K); (scanned from paper original: notes about this process)
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