Influence of salinity on light conditions and phytoplankton growth in a turbid river

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Show simple item record Oliver, RL Mitrovic, SM Rees, C 2012-02-02T06:31:16Z 2010-09
dc.identifier.citation River Research and Applications, 2010, 26 (7), pp. 894 - 903
dc.identifier.issn 1535-1459
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract A turbid lowland river in Australia was studied to describe factors influencing the light conditions for phytoplankton growth. Vertical attenuation coefficients correlated with nepholometric turbidity enabling estimation of euphotic depths (z eu) from long term turbidity monitoring. Light conditions were assessed from the ratio of z eu to the maximum water depth (z m). Predominantly z eu/z m ratios were below 0.2, a value indicating the minimum light conditions required to support phytoplankton growth. A transitional state with z eu/z m between 0.2 and 0.35 occurred 15% of the time, while light sufficiency occurred for 30% of the time. Peaks in eukaryotic phytoplankton biomass developed when z eu/z m was at or above transitional values. Large increases in cyanobacterial numbers (Anabaena sp.) only occurred when z eu/z m exceeded 0.35. Turbidity increased quickly with elevated flows but did not decline substantially as flows reduced and light limiting conditions extended into low flow periods otherwise conducive to phytoplankton growth. However, during extended periods of reduced flows conductivity increased causing a substantial reduction in turbidity with concomitant improvements in light penetration. A turbidity of ca. 100 NTU marked the transition to light sufficiency at the study site and occurred at a conductivity of ca. 300μScm -1 demonstrating that small changes in salinity can have major effects on light penetration. These results show that flow, salinity and turbidity all play a part in determining the growth conditions for phytoplankton in turbid rivers. © 2009 John Wiley & Sons, Ltd.
dc.language eng
dc.relation.isbasedon 10.1002/rra.1309
dc.title Influence of salinity on light conditions and phytoplankton growth in a turbid river
dc.type Journal Article
dc.parent River Research and Applications
dc.journal.volume 7
dc.journal.volume 26
dc.journal.number 7 en_US
dc.publocation USA en_US
dc.identifier.startpage 894 en_US
dc.identifier.endpage 903 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.personcode 944240
dc.percentage 100 en_US Ecology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords Anabaena
dc.description.keywords Light limitation
dc.description.keywords Phytoplankton
dc.description.keywords Salinity
dc.description.keywords Turbidity
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 false
utslib.collection.history School of the Environment (ID: 344)
utslib.collection.history Closed (ID: 3)

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