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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 10 | PAGES 1953-1961 | 1998
© Oxford University Press

research-article

Gut pigment destruction by the copepod Acartia clausi

V. Tirelli and P. Mayzaud

Oceéanographie Biochimique et Ecologie LOBEPM URA-CNRS 2077 Observatoire Oceéanologique BP 28, F06230 Villefranche sur Mer, France

Received on February 15, 1998; accepted on May 27, 1998 The extent of chlorophyll (Chi) a degradation into colorless products by the copepod Acartia clausi was determined by measuring gut fluorescence prior to fecal pellet production. The efficiency of pigment degradation of animals fed at different concentrations of Thalassiosira weiss-fiogii varied between 30.56 and 94.05%, and the quantity of pigments lost during gut passage was directly related to total ingestion. The role of feeding history in pigment destruction was tested. The fraction of ingested Chi a degraded by copepods acclimated to a high food concentration (15 ng Chl a ml–1) was greater than the fraction degraded by those acclimated to a low food concentration (1.5 ng Chl a ml–1). The percentage of ingested Chl a that A.clausi transformed into fluorometrically undetected compounds was not constant. At present, knowledge of the pigment destruction process indicates that Chi a and Chi --derived pigments are not considered useful quantitative tracers of the feeding activity of copepods. The results of this study suggest a reassessment of the application of the gut fluorescence method to evaluate grazing activity of the copepod A.clausi


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