New Zealand Journal of Marine and Freshwater Research abstracts

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Mechanisms of co-existence and exclusion of zooplankton by cyanobacteria in Lake Rotongaio

*CAROLYN W. BURNS¹

DONAL J. FORSYTH²

JAMES F. HANEY³

MARK R. JAMES²

WINFRIED LAMPERT⁴

RICK D. PRIDMORE⁵

¹Department of Zoology University of Otago Dunedin, New Zealand

²Taupo Research Laboratory Department of Scientific and Industrial Research P. O. Box 415, Taupo, New Zealand

³Department of Zoology University of New Hampshire Durham, New Hampshire, U.S.A.

⁴Department of Physiological Ecology Max Planck Institute of Limnology Plon, West Germany

⁵Water Quality Centre Ministry of Works and Development Hamilton, New Zealand

Abstract Plankton in Lake Rotongaio in February-March 1987 was dominated by high densities of the cyanobacterium Anabaena sp., yet also contained moderately dense populations of the herbivorous crustacean grazers Boeckella propinqua, Bosmina meridionalis, and Ceriodaphnia dubia. Lacking from the lake was the large cladoceran Daphnia carinata, that occurs in some other lakes in the region. We conducted field and laboratory studies to address the following questions:

(1)    Is Anabaena detrimental to the zooplankton in Lake Rotongaio, and if so, by what means do they co-exist?

(2)    Could the absence of Daphnia in Lake Rotongaio be attributed to the presence of Anabaena?

New Zealand Journal of Marine and Freshwater Research, 1987, Vol. 21: 537-538 0028-8330/87/2103-0537$2.50/0 © Crown copyright 1987 Received 21 April 1987; accepted 29 May 1987

PDF file of entire paper: medium quality (158K); (scanned from paper original: notes about this process)

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