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Vertical distribution of zooplankton biomass during summer stratification in the western Mediterranean
Alcaraz, M. (1985). Vertical distribution of zooplankton biomass during summer stratification in the western Mediterranean, in: Gibbs, P.E. (Ed.) Proceedings of the 19th European Marine Biology Symposium, Plymouth, Devon, UK, 16-21 September 1984. pp. 135-143
In: Gibbs, P.E. (Ed.) (1985). Proceedings of the 19th European Marine Biology Symposium, Plymouth, Devon, UK, 16-21 September 1984. Cambridge University Press: Cambridge. ISBN 0-521-30294-3. 541 pp., more

Available in  Author 
    VLIZ: Proceedings [16835]
Document type: Conference paper

Keyword
    Marine

Author  Top 
  • Alcaraz, M.

Abstract
    The vertical distribution of zooplankton biomass, expressed as the organic nitrogen content of the mesoplankton ( > 200 µm fraction), was studied at a series of stations located along a transect from Barcelona to the channel between the islands of Mallorca and Menorca during July 1982. Sampling depths between 5 and 200 m were selected according to the vertical distribution of chlorophyll. Vertical profiles of mesoplankton N during the day showed the existence of a zooplankton maximum at a depth ranging from 60 to 90 m. Its position coincided with the chlorophyll maximum. On some occasions, 60% of the total zooplankton biomass was concentrated in a layer 10 m thick. At night, due to the vertical migration of zooplankton, the biomass maximum was displaced upwards to an average depth of 25m. This observation has interesting ecological implications: if zooplankton feed during the daylight hours in the deep phytoplankton layer and migrate to the surface waters (and excrete there) at night, the downward transport of nutrients, could be retarded.

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