The Seasonal Variation of the Free and Combined Dissolved Amino Acids in the Irish Sea

Riley, J.P.; Segar, Douglas A.

doi:10.1017/s0025315400004975

Cited by 82 publications

(41 citation statements)

References 17 publications

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“…In shallow estuaries, their occurrence is only partly reflected in chlorophyll a concentrations and in phytoplankton cell density, whereas macrophyte and sediment surface appeared as the major sources (Jerrgensen, 1982;Macko and Green, 1982). In open waters, the situation differs and increases of DFAA concentrations during, or following, periods of high primary production are sometimes reported (Wood, 1966;Riley and Segar, 1970;Crawford et al, 1974). Excretion of nitrogen compounds by various organisms, including zooplankton crustaceans, may also contribute to the addition of non-algal amino acids (Webb and Johannes, 1967;Lampert, 1978).…”

Section: Resultsmentioning

confidence: 99%

Distribution of dissolved free amino acids in the Ushant front region

Poulet¹,

Martin‐Jézéquel²,

Head³

1984

Mar. Ecol. Prog. Ser.

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Measurements of dissolved free amino acids (DFAA) combined to phytoplankton and particulate matter parameters of water samples are described with reference to spring and summer hydrological conditions offshore the coast of Brittany in the Ushant front region. DFAA were found to exhibit vertical, lateral, diel and seasonal variations. Major differences were due to variations of a limited number of amino acids: aspartic acid, serine, histidine, threonine, glycine, alanine, leucine and ornithine. They were found to be enriched at the boundaries of the halothermoclines and the frontal region. Spectra of amino a c~d s and total DFAA concentrations were rather similar in samples representative of mixed and stratified waters at a given season. There were no significant correlations between total DFAA concentration and phytoplankton pigments. The magnitude of seasonal and diel variations of amino acids suggest that their turnover may be related to a variety of biological, physiological and biochemical processes prevailing in the pelagic ecosystem.

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Section: Resultsmentioning

confidence: 99%

Distribution of dissolved free amino acids in the Ushant front region

Poulet¹,

Martin‐Jézéquel²,

Head³

1984

Mar. Ecol. Prog. Ser.

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“…(4) Several studies of amino acid abundance in seawater showed that the composition of the amino acid pool is relatively constant and glutamic acid represents 5 to 13% of the total pool (Siegel and Degens, 1966;Riley and Segar, 1970;Clark, 1972;Daumas, 1976;Williams eta[., 1976;Billens et ak, 1980;Dawson and Gocke, 1980). Using these assumptions and estimates of heterotrophic activity, the maximum estimated contribution of bacteria to NH4 regeneration was 25% with an average 16% for spring and summer (Table 3 C).…”

Section: Discussionmentioning

confidence: 99%

Ammonium regeneration: its contribution to phytoplankton nitrogen requirements in a eutrophic environment

LaRoche

1983

Mar. Biol.

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Ammonium regeneration, nutrient uptake, bacterial activity and primary production were measured from March to August 1980 in Bedford Basin, Nova Scotia, Canada, a eutrophic environment. Rates of regeneration and nutrient uptake were determined using 15N isotope dilution and tracer methodology. Although primary production, nutrient uptake and ammonium regeneration were significantly intercorrelated, no relationship was detected between these parameters and heterotrophic activity. The average contribution of ammonium to total nitrogen (ammonium + nitrate) uptake was similar in the spring and in the summer (approximately 60%). On a seasonal average basis, 36% of the phytoplankton ammonium uptake could be supplied by rapid remineralization processes. In spite of the high average contribution of NH4 regeneration to phytoplankton ammonia uptake, there is indirect evidence suggesting that other NH4 sources may occasionally be important.

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“…This hydrocarbon may be produced from an abundant phytoplankton that DOC increased during the spring phytoplankton bloom. Other workers have monitored specific organic compounds such as amino acids (Riley and Segar, 1970) and hydrocarbons and fatty acids (Schultz and Quinn, 1977) in coastal regions and also noted the coincidence of specific compound level increases with phytoplankton blooms. Consequently, it would be expected that certain volatiles would increase in concentration during local spring (and fall) algal blooms (Fish, 19l1;Lillick, 1937;Yentsch and Ryther, 1959).…”

Section: Sumrymentioning

confidence: 97%

Volatile organic compounds in seawater

Gschwend¹

1979

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The Seasonal Variation of the Free and Combined Dissolved Amino Acids in the Irish Sea

Cited by 82 publications

References 17 publications

Distribution of dissolved free amino acids in the Ushant front region

Distribution of dissolved free amino acids in the Ushant front region

Ammonium regeneration: its contribution to phytoplankton nitrogen requirements in a eutrophic environment

Volatile organic compounds in seawater

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