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Changes of the concentrations of chlorophyll and phaeopigment in grazing experiments
Helling, G.R.; Baars, M.A. (1985). Changes of the concentrations of chlorophyll and phaeopigment in grazing experiments. Hydrobiol. Bull. 19(1): 41-48
In: Hydrobiological Bulletin. Netherlands Hydrobiological Society: Amsterdam. ISSN 0165-1404, more
Peer reviewed article  

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Keywords
    Chlorophylls; Fluorimeters; Grazing; Particle counters; Phytoplankton; Pigments; Zooplankton; Calanus finmarchicus (Gunnerus, 1770) [WoRMS]; Marine

Authors  Top 
  • Helling, G.R.
  • Baars, M.A.

Abstract
    In grazing experiments, the changes in fluorometric determined concentrations of chlorophyll a and phaeopigment are probably less bothered by the interference of other chlorophyll pigments than in analysis of single seawater samples. Theoretically, phaeopigment recovery will be ca 100%, regardless the eventual presence of chlorophyll b. In shipboard experiments in the northern North Sea in May 1983 the chlorophyll consumption by zooplankton was compared with phaeophorbide egestion. Phaeophorbide recovery amounted on average to 67%, comparable with a previous estimate in laboratory experiments by Shuman & Lorenzen (1975). Because phaeophorbide concentrations are expressed in chlorophyll equivalents, one third of the chlorophyll consumed is apparently degraded further than phaeophorbide into non-fluorescent material. In grazing experiments with Calanus finmarchicus stages CIV, CV and CVI female filtering rates were determined both with the chlorophyll method and with a particle counter.

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