Excretion of ammonia by zooplankton and its potential contribution to nitrogen requirements for primary production in the Catalan Sea (NW Mediterranean)
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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1994-04
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Subjects: | Biomass, Phytoplankton, Potential Contribution, Particulate Organic Matter, Carbon Fixation, |
Online Access: | http://hdl.handle.net/10261/256128 http://dx.doi.org/10.13039/501100007273 |
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dig-icm-es-10261-2561282021-12-16T08:33:03Z Excretion of ammonia by zooplankton and its potential contribution to nitrogen requirements for primary production in the Catalan Sea (NW Mediterranean) Alcaraz, Miquel Saiz, Enric Estrada, Marta Comisión Interministerial de Ciencia y Tecnología, CICYT (España) Biomass Phytoplankton Potential Contribution Particulate Organic Matter Carbon Fixation 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 This work was supported by CICYT Grants MAR88-0252 to M. Estrada and MAR-91-0359 to M. Alcaraz, and a Postdoctoral Fellowship PF91 46035640 to E. Saiz, We thank C. Marras6 and R. Margalef for their critical reading of the manuscript, and I. Casals and the Servei d'An~lisi de la Facultat de Biologia de l'Universitat de Barcelona for carbon and nitrogen analyses 2021-12-15T14:30:02Z 2021-12-15T14:30:02Z 1994-04 2021-12-15T14:30:02Z artículo http://purl.org/coar/resource_type/c_6501 issn: 0025-3162 e-issn: 1432-1793 Marine Biology 119: 69-76 (1994) http://hdl.handle.net/10261/256128 10.1007/BF00350108 http://dx.doi.org/10.13039/501100007273 https://doi.org/10.1007/BF00350108 Sí none Springer |
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Biomass Phytoplankton Potential Contribution Particulate Organic Matter Carbon Fixation Biomass Phytoplankton Potential Contribution Particulate Organic Matter Carbon Fixation |
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Biomass Phytoplankton Potential Contribution Particulate Organic Matter Carbon Fixation Biomass Phytoplankton Potential Contribution Particulate Organic Matter Carbon Fixation Alcaraz, Miquel Saiz, Enric Estrada, Marta 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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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 |
author2 |
Comisión Interministerial de Ciencia y Tecnología, CICYT (España) |
author_facet |
Comisión Interministerial de Ciencia y Tecnología, CICYT (España) Alcaraz, Miquel Saiz, Enric Estrada, Marta |
format |
artículo |
topic_facet |
Biomass Phytoplankton Potential Contribution Particulate Organic Matter Carbon Fixation |
author |
Alcaraz, Miquel Saiz, Enric Estrada, Marta |
author_sort |
Alcaraz, Miquel |
title |
Excretion of ammonia by zooplankton and its potential contribution to nitrogen requirements for primary production in the Catalan Sea (NW Mediterranean) |
title_short |
Excretion of ammonia by zooplankton and its potential contribution to nitrogen requirements for primary production in the Catalan Sea (NW Mediterranean) |
title_full |
Excretion of ammonia by zooplankton and its potential contribution to nitrogen requirements for primary production in the Catalan Sea (NW Mediterranean) |
title_fullStr |
Excretion of ammonia by zooplankton and its potential contribution to nitrogen requirements for primary production in the Catalan Sea (NW Mediterranean) |
title_full_unstemmed |
Excretion of ammonia by zooplankton and its potential contribution to nitrogen requirements for primary production in the Catalan Sea (NW Mediterranean) |
title_sort |
excretion of ammonia by zooplankton and its potential contribution to nitrogen requirements for primary production in the catalan sea (nw mediterranean) |
publisher |
Springer |
publishDate |
1994-04 |
url |
http://hdl.handle.net/10261/256128 http://dx.doi.org/10.13039/501100007273 |
work_keys_str_mv |
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