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Excretion of ammonia by zooplankton and its potential contribution to nitrogen requirements for primary production in the Catalan Sea (NW Mediterranean)

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Abstract

Excretion of ammonia by mesozooplankton (>200 μm zooplankton) and its potential contribution to the nitrogen requirement for phytoplankton growth has been estimated for different hydrographical situations along a transect across the Catalan Sea (Northwestern Mediterranean). The nitrogen excreted as ammonia was estimated from mesozooplankton biomass and specific excretion rates. Nitrogen requirements of phytoplankton were estimated by means of carbon fixation rates and C:N ratios of <200 μm particulate organic matter. Minimum C:N ratios and maximum primary production, zooplankton biomass, phytoplankton nitrogen requirements, and nitrogen excretion of zooplankton occurred near the Catalan density front. On average, the nitrogen regenerated by the mesozooplankton accounted for 43% of the nitrogen requirements of the phytoplankton. The specific excretion rates of ammonia and the percentage of phytoplanktonnitrogen requirements supplied by excreted nitrogen were higher at coastal stations. In some coastal and frontal stations, the ammonia excreted exceeded the phytoplanktonnitrogen demand. Bacteria competing for nutrient supply and the possible uncoupling between rate processes and standing stocks of phyto- and zooplankton could explain the apparent excess of regenerated ammonia.

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Authors and Affiliations

  1. Institut de Ciències del Mar (CSIC), Ps. Joan de Borbó S/N, E-08039, Barcelona, Spain

    M. Alcaraz, E. Saiz & M. Estrada

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  1. M. Alcaraz
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  2. E. Saiz
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  3. M. Estrada
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Communicated by J. M. Pérès, Marseille

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Alcaraz, M., Saiz, E. & Estrada, M. Excretion of ammonia by zooplankton and its potential contribution to nitrogen requirements for primary production in the Catalan Sea (NW Mediterranean). Marine Biology 119, 69–76 (1994). https://doi.org/10.1007/BF00350108

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  • DOI: https://doi.org/10.1007/BF00350108

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