Vertical disentrainment of Anabaena circinalis in the turbid, freshwater Darling River, Australia: Quantifying potential benefits from buoyancy

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Show simple item record Mitrovic, SM Bowling, LC Buckney, RT 2009-12-21T02:30:01Z 2001
dc.identifier.citation Journal of Plankton Research, 2001, 23 (1), pp. 47 - 55
dc.identifier.issn 0142-7873
dc.identifier.other C1 en_US
dc.description.abstract The migration patterns of phytoplankton through time and depth were measured in the Darling River at Trevallyn, New South Wales, Australia during a bloom of Anabaena circinalis. Anabaena circinalis was able to disentrain and maintain position within surface waters during the early morning, coinciding with the diel period of least wind speeds and a state of no detectable thermocline (0.1°C detection limit). Anabaena circinalis concentrations were up to 10 times higher in the surface waters than in the bottom waters during the morning sampling periods. Afternoon and midnight sampling periods revealed either a small amount of surface accumulation or none. All other phytoplankton were found to have a relatively even distribution throughout the water column at all time periods measured (except Aulacoseira on one occasion). These vertical distribution data were used to determine the potential benefit buoyant A.circinalis could gain over an evenly distributed population using a quantitative estimate of primary productivity. The buoyant population was found to have a daily integral of photosynthetic O2 production of 3.63 mol m-2 five times greater than that for the evenly distributed population. Losses due to respiration were greater for the evenly distributed population (29.5%) than the buoyant population (4.8%), probably due to the amount of time cells spent outside the euphotic zone. It is suggested that buoyancy may offer considerable advantage to A.circinalis in gaining dominance in turbid freshwater rivers. Further, buoyancy may offer some advantage even without strong thermal gradients.
dc.language eng
dc.title Vertical disentrainment of Anabaena circinalis in the turbid, freshwater Darling River, Australia: Quantifying potential benefits from buoyancy
dc.type Journal Article
dc.parent Journal of Plankton Research
dc.journal.volume 1
dc.journal.volume 23
dc.journal.number en_US
dc.publocation Oxford, England en_US
dc.identifier.startpage 47 en_US
dc.identifier.endpage 55 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 060204 Freshwater Ecology
dc.for 050206 Environmental Monitoring
dc.personcode 800142
dc.personcode 944240
dc.percentage 60 en_US Environmental Monitoring en_US
dc.classification.type FOR-08 en_US
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - Environmental Science
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history Closed (ID: 3)
utslib.collection.history School of the Environment (ID: 344)

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