New Zealand Journal of Marine and Freshwater Research abstracts
Crustacean zooplankton communities in a New Zealand lake during four decades
of trophic change
M. A. CHAPMAN
J. D. GREEN
Biological Sciences
Waikato University
P. O. Box 3105
Hamilton, New Zealand
Abstract Lake Rotorua is a eutrophic polymictic lake in the
centre of the North Island, New Zealand. Three studies of its crustacean
zooplankton, in 1955-56, 1967-69, and 1994-95 have been made. Despite increased
eutrophication since the first study, species composition has not changed: the
calanoid copepod,
Calamoecia lucasi, dominates for much of the year and
Bosmina cf.
meridionalis and
Ceriodaphnia cf.
dubia
are the only limnetic cladocerans. Comparison of their annual cycles in
abundance between the studies show little regularity in the seasonal patterns,
suggesting that stochastic events, such as storms, may be the most important
controlling factors through their effects on food levels.
Keywords New Zealand; lakes; zooplankton; eutrophication;
Lake Rotorua; Calamoecia; Bosmina; Ceriodaphnia
M98033
Received 24 June 1998; accepted 1 April 1999
PDF file of entire paper: medium quality (752K); (scanned from paper original: notes about this process)
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