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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Official URL: http://dx.doi.org/10.1093/plankt/fbi068
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.
|Institutes:||Nederlands Instituut voor Ecologie (NIOO)|
|Deposited On:||23 Nov 2011 01:00|
|Last Modified:||24 Apr 2012 16:32|
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