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JOURNAL OF PLANKTON RESEARCH | VOLUME 14 | NUMBER 3 | PAGES 329-342 | 1992
© Oxford University Press

research-article

The seasonal population changes and carbon budget of the calanoid copepod Boeckella minuta Sars in a newly formed sub-tropical reservoir

C.R. King and J.G. Greenwood1

School of Life Science, Queensland University of Technology Brisbane Q4001 1Department of Zoology, University of Queensland St Lucia Qld 4072, Australia

Received on November 15, 1990; accepted on July 29, 1991 The population carbon budget and seasonality of Boeckella minuta in a newly formed subtropical reservoir were examined 3 years after the reservoir filled. Average daily biomass was 26.4 mg C m–3 and the annual population carbon budget was: consumption 2470, egestion 1482, assimilation 988, production 493 and respiration 495, mg C m–3 year–1, and the average P/B and P/A ratios were 0.08 and 0.5 respectively. Clutch size and reproductive effort (egg production/assimilation) were low, and the proportion of males decreased throughout the population cycle. The seasonal abundance pattern changed from perennial (pre-filling years) to a 7 month cycle. It is suggested that eutrophication and the spring bloom of cyanobacteria may have accentuated a seasonal decrease in reproductive effort and survival, leading to an absence of planktonic stages during summer, and that resting eggs facilitated population survival during the summer period of stratification.


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