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Optical changes associated with cyanobacterial bloom termination by viral lysis

Simis, S.G.H. and Tijdens, M. and Hoogveld, H.L. and Gons, H.J. (2005) Optical changes associated with cyanobacterial bloom termination by viral lysis. Journal of Plankton Research, 27, 937-949. ISSN 0142-7873.

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Optical changes that accompanied a collapse of the population of filamentous cyanobacteria from a shallow, eutrophic lake were studied in laboratory-scale enclosures (LSEs). The experimental conditions are known, from previous work on these systems, to cause a dramatic collapse of the dominant algal or cyanobacterial species, which in turn can be associated with viral activity. Within 2 weeks of continuous addition of nutrient-rich growth medium, near-complete collapse of the dominant population occurred over the span of a few days. The collapse was repeatedly and reproducibly observed and was primarily characterized by a marked increase in water transparency. Scattering of light decreased by 80%, absorption decreased by 20-80%. There was high similarity in optical changes between several experiments, carried out in different seasons. An increase of dissolved material and submicron-sized particles (SMP) that showed chlorophyll a (Chl a) absorption was observed during the collapse. The phycocyanin (PC): Chl a ratio and phaeopigment : Chl a ratio proved to be good indicators of the observed collapse. Reflectance spectra that were modelled using a constant volume-scattering function indicated that mass mortality of this magnitude can be detected in natural systems using current remote sensors.

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:11787
Deposited On:23 Nov 2011 01:00
Last Modified:31 Mar 2014 11:08

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