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JOURNAL OF PLANKTON RESEARCH | VOLUME 1 | NUMBER 4 | PAGES 301-311 | 1979
© Oxford University Press

research-article

Food ingestion and digestive transit time in the euphausiid Meganyctiphanes norvegica as a function of animal size

M. Heyraud

International Laboratory of Marine Radioactivity Musée Ocianographique, Monaco

Received on January 1, 1979; revised on August 1, 1979; accepted on November 1, 1979 Laboratory experiments with Meganyctiphanes norvegica of different sizes (7 to 70 mg dry) fed on Artemia salina show that the daily specific ingestion rate varies with animal weight according to a power law with a negative exponent of -0.58. This relation is used to calculate the production rate of faeces which is higher in the smaller individuals when expressed as a percentage of animal weight; a comparison of the M. norvegica data with published data for Calanus helgolandicus indicates that this rate is higher for the smaller species. Under the experimental conditions used the digestive transit time of food in M. norvegica is appreciably shorter in smaller animals (15 minutes versus 30 minutes). The data, combined with other data previously obtained for the same ipecies, show that the metabolism of active, well-fed individuals is about three times higher than the standard metabolism.


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