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Perennial domination of phytoplankton by Botryococcus and Peridinium in a discontinuously polymictic reservoir (tropical Australia)

Townsend, SA (2001). Perennial domination of phytoplankton by Botryococcus and Peridinium in a discontinuously polymictic reservoir (tropical Australia). Archiv fur Hydrobiologie,151(4):529-548.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 9 times in Scopus Article | Citations
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Title Perennial domination of phytoplankton by Botryococcus and Peridinium in a discontinuously polymictic reservoir (tropical Australia)
Author Townsend, SA
Journal Name Archiv fur Hydrobiologie
Publication Date 2001
Volume Number 151
Issue Number 4
ISSN 0003-9136   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-0034945160
Start Page 529
End Page 548
Total Pages 20
Place of Publication Stuttgart, Germany
Publisher E. Schweizerbart'sche Verlagsbuchhandlung
HERDC Category C1 - Journal Article (DEST)
Abstract The effect of holomixis and wet season inflow on the phytoplankton composition of Darwin River Reservoir (DRR) is examined. Both phenomena constitute potential disturbances to the pelagic environment of this shallow (average depth 6 m) tropical reservoir and its phytoplankton community. Over the two year study period, the phytoplankton concentration of DRR remained much the same (0.48-2.4 mm(3)/L). At least half the biovolume comprised two species, Botryococcus braunii and Peridinium gutwinskii. These two taxa, together with other Peridinium species and desmids (predominantly Staurastrum and Cosmarium) constituted 68-98% of the reservoir's total phytoplankton biovolume. Potential disturbance by wet season inflow and 13 holomictic events had minimal affect on the domination of the Botryococcus-Peridinium-Desmidaceae assemblage, owing mainly to their short duration (4-5 days) and minor influence on light intensities in the mixed layer. Some holomictic events, however, favoured the growth of the diatom Aulacoseira granulata which reached a maximum of 17 % of the reservoir's total phytoplankton biovolume. Fast growing, small r-selected phytoplankton, which are favoured by nutrient rich waters, constituted a minor component (
Keywords disturbance
k-selected species
species composition
holomixis
succession
lake constance
retention time
succession
stratification
disturbance
periodicity
biomass
 
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