Grazing by a resident macrozooplankton community and non-resident Daphnia carinata king

A preliminary in situ incubation study

T. Kobayashi*, A. Church, S. Hardiman, L. Gallagher

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A 24 h incubation study was conducted in situ in Manly Dam reservoir, Sydney, Australia. The study aimed to evaluate the relative effectiveness of grazing on phytoplankton by a resident macrozooplankton community, dominated by the cladoceran Ceriodaphnia and some copepods, in comparison with grazing by added, non-resident Daphnia carinata in the absence of the resident macrozooplankton community. Although there was some variability in the measured grazing rates among incubation bottles (volume: 1.28 L), D. carinata with a mean body size of 30.8 μg dry weight were more efficient grazers than the reservoir macrozooplankton community with a mean body size of 2.5 μg dry weight. The weight-specific clearance rate of D. carinata was 2-65 times higher than that of the resident reservoir community for five taxa of reservoir phytoplankton examined. In comparing the evidence from the literature on the limited ability of D. carinata to graze on cyanobacteria, a management strategy using D. carinata for the reduction of phytoplankton biomass may need to be considered separately from one designed to specifically control undesirable taxa, such as the cyanobacteria Microcystis and Anabaena.

Original languageEnglish
Pages (from-to)193-203
Number of pages11
JournalLakes and Reservoirs: Research and Management
Volume3
Issue number3-4
DOIs
Publication statusPublished - Sep 1998
Externally publishedYes

Keywords

  • Australian reservoir
  • Biomanipulation
  • Daphnia
  • Macrozooplankton grazing
  • Weight-specific clearance rate

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