Structuring of the cyanobacterial community by pelagic fish in subtropical reservoirs: Experimental evidence from Australia

Hunt, R. J., Matveev, V., Jones, G. J. and Warburton, K. (2003) Structuring of the cyanobacterial community by pelagic fish in subtropical reservoirs: Experimental evidence from Australia. Freshwater Biology, 48 8: 1482-1495. doi:10.1046/j.1365-2427.2003.01090.x


Author Hunt, R. J.
Matveev, V.
Jones, G. J.
Warburton, K.
Title Structuring of the cyanobacterial community by pelagic fish in subtropical reservoirs: Experimental evidence from Australia
Journal name Freshwater Biology   Check publisher's open access policy
ISSN 0046-5070
1365-2427
Publication date 2003-08-01
Sub-type Article (original research)
DOI 10.1046/j.1365-2427.2003.01090.x
Volume 48
Issue 8
Start page 1482
End page 1495
Total pages 14
Place of publication Oxford, U.K.
Publisher Blackwell Publishing
Collection year 2003
Language eng
Subject C1
270701 Freshwater Ecology
770402 Land and water management
0704 Fisheries Sciences
Formatted abstract
1. Subtropical reservoirs of Australia are commonly subject to summer blooms of cyanobacteria. The potential for food web manipulation to control cyanobacterial blooms was investigated in Lake Maroon, south east Queensland using enclosures in which the density of the Australian gudgeon Hypseleotris spp. was manipulated.

2. Zooplankton biomass and community structure were strongly affected by fish density. A size dependent predation effect of Hypseleotris on zooplankton was observed at ambient fish densities, and the community shifted towards a dominance of copepod juveniles and nauplii. Substantial increases in the populations of Ceriodaphnia and calanoid copepods were observed at low fish densities and in the absence of fish.

3. At ambient fish densities total phytoplankton and the proportion of cyanobacteria were maintained at levels similar to those prevailing at day 0. Total phytoplankton and the proportion of cyanobacteria decreased substantially at low fish densities and in the absence of fish. Chlorophytes became dominant in the 'no fish' treatment and the grazing-resistant species Oocystis and Dictyosphaerium were significantly higher than at ambient fish densities.

4. The experiment demonstrated a strong positive relationship between Hypseleotris density and cyanobacteria, and the results suggest that subtropical reservoirs may be suited to food web manipulation as a means of controlling summer cyanobacterial blooms.
© 2003 Blackwell Publishing Ltd
Keyword Marine & Freshwater Biology
Cyanobacteria
Food webs
Phytoplankton
Planktivorous fish
Zooplankton
Top-down control
Plankton community
Eutrophic lake
Food-web
Biomanipulation
Phosphorus
Blooms
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 05:15:29 EST