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Relationship between the zooplankton, phytoplankton, particulate matter and dissolved free amino acids in the Celtic Sea Williams, R.; Poulet, S.A. (1986). Relationship between the zooplankton, phytoplankton, particulate matter and dissolved free amino acids in the Celtic Sea. Mar. Biol. (Berl.) 90(2): 279-284. https://dx.doi.org/10.1007/BF00569139 In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793

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Beschikbaar in	Auteurs
VLIZ: Non-open access 354423 [ aanvragen ]

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Trefwoorden

Acids > Organic compounds > Organic acids > Amino acids ANE, Celtic Sea Aquatic communities > Plankton > Phytoplankton Aquatic communities > Plankton > Zooplankton Distribution > Geographical distribution > Vertical distribution Environmental factors Organic matter > Dissolved organic matter Particulates > Suspended particulate matter Temporal variations > Periodic variations > Diurnal variations Celtic Sea [Marine Regions] Marien/Kust

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Auteurs		Top
Williams, R. Poulet, S.A.

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Abstract

Estimates of the biomass of zooplankton, phytoplankton and particulate matter collected in the Celtic Sea during mixed-water conditions (on 8 and 9 April 1983) were compared to the concentration and diversity of sixteen dissolved free amino acids (DFAA) measured in seawater and in particles. During a day profile, variations of dissolved amino acids with depth reflected the feeding activity of copepods. The relationship was not apparent in a night profile and other processes, such as heterotrophic utilization of dissolved nitrogen by microorganisms, were thought to be involved. The ratios of total DFAA concentration (nM litre-1) in the particulate phase over the concentration in seawater ranged from 1 to 200 within the water column. Of the sixteen amino acids measured, ornithine, a decomposition product of arginine, was responsible for more than 70% of the total concentration of DFAA in seawater. In the particles, phenylalanine ranged from 30 to 88% of total DFAA. In seawater this amino acid occurred in the 20 to 40 m depths (1.3 to 9.9% of total DFAA) in the day profile and at 5 m (12.4%) and 80 m (6.4%) in the night profile. Previously it has only been found in very low concentrations (<5%) in seawater, and its presence is considered to be the result of zooplankton feeding.

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