The role of amino acids in the nitrogen cycle of Lake Mendota1

Gardner, Wayne S.; Lee, G. Fred

doi:10.4319/lo.1975.20.3.0379

Cited by 46 publications

(27 citation statements)

References 15 publications

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“…2). Except for a few samples from Lake Almind, the DFAA pools measured in the lakes fall within concentrations typically reported from both lake water (Burnison and Morita 1974;Gardner and Lee 1975;Jorgensen et al 1983) and coastal seawater (Billen et al 1980;Macko and Green 1982).…”

Section: Discussionmentioning

confidence: 90%

“…Free amino acids actually have been produced during bacterial degradation of phytoplankton proteins (Amano et al 1982). Observations of natural waters also indicate that increased levels of DFAA follow periods of a high phytoplankton production (Bohling 1970;Gardner and Lee 1975;Riley and Segar 1970;de Haan and de Boer 1979). The presence of DAPA in some samples demonstrates that degradation of bacteria correspondingly contributes free amino acids to the ambient DFAA pools.…”

Section: Discussionmentioning

confidence: 99%

“…These amino acids previously have been found abundant not only in lakes (Gardner and Lee 1975;Jorgensen 1986), but also in coastal seawater (Dawson and Gocke 1978;Billen et al 1980). Since serine, glycine, and alanine are common, but not dominant, protein amino acids of pelagic organisms like phyto-and zooplankton (Cowey and Corner 1966;Parsons et al 1977), and since ornithine is a nonprotein amino acid, processes other than protein hydrolysis must have been involved in the production of the DFAA.…”

Section: Discussionmentioning

confidence: 99%

“…High concentrations of DFAA have been reported to coincide with declining or senescent phytoplankton blooms in the sea (Bohling 1970;Riley and Segar 1970) and in eutrophic lakes (Gardner and Lee 1975;de Haan and de Boer 1979), as well as during the late exponential growth phase of a marine diatom (Poulet and Martin-Jezequel 1983). Diel concentration increases in the sea have been related to zooplankton "sloppy" feeding (Mopper and Lindroth 1982).…”

mentioning

confidence: 99%

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Free amino acids in lakes: Concentrations and assimilation rates in relation to phytoplankton and bacterial production1

Jørgensen

1987

Limnology & Oceanography

112

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Diel changes of concentrations and assimilation rates of dissolved free amino acids (DFAA) were followed every third day during periods of 3-5 weeks in eutrophic Frederiksborg Slotsss and Lake Hylke and oligotrophic Lake Almind. Concentrations of DFAA varied from 78 to 3,672 nM, but most concentrations were between 200 and 1,600 nM. Diel variations of DFAA ranged from < lo%, but were occasionally 500%. In Fr. Slotsso, concentrations were maximal in the morning and minimal at noon. The high morning concentrations coincided with the diel minimum bacterial production. In Lake Hylke mean concentrations were measured at noon, but in Lake Almind no diel trends were obvious. Statistical analyses demonstrate that long-term changes of the DFAA pools in the lakes were negatively correlated with both primary production (except Lake Almind) and bacterial production.In Fr. Slotsso and Lake Hylke, assimilation of DFAA (based on assimilation of five abundant DFAA) did not demonstrate diel trends, but within the study periods, the mean diel assimilation rates correlated negatively with primary production. In Lake Almind, no tendencies in the DFAA assimilation rates were observed. Carbon flux of DFAA assimilation in the lakes on the average made up from 6.9 to 11.3% of the primary production, and from 28.5 to 93.1% of the bacterial production, determined with the [3H]thymidine incorporation procedure. Data from the two eutrophic lakes suggest that degradation of phytoplankton can be a major source of DFAA in lakes.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Free amino acids in lakes: Concentrations and assimilation rates in relation to phytoplankton and bacterial production1

Jørgensen

1987

Limnology & Oceanography

112

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“…Stewart, f969 (A) (Jones and Stewarct, 1969 (B); Gardner and Lee, 1975) (Schindler, unpublished. data of the E.L.A. In order to sinplify the analysis, no attenpt was rn¿de to assess the effects of sediment feedback of nutrients upon the N:P loading ratios.…”

Section: Project)mentioning

confidence: 99%

Nitrogen Fixation in Canadian Precambrian Shield Lakes

Flett¹,

Schindler²,

Hamilton³

et al. 1980

Can. J. Fish. Aquat. Sci.

135

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The role of internal nitrogen loading in supportingnon‐N‐fixing harmful cyanobacterial blooms in the water column of a large eutrophic lake

Hoffman

McCarthy

Boedecker

et al. 2022

Limnology & Oceanography

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Western Lake Erie cyanobacterial harmful algal blooms (cyanoHABs) occur every summer as a result of anthropogenic nutrient loading. Although the physiological importance of nitrogen (N) in supporting bloom biomass and toxin production is established, the role of internal N recycling in the water column to support bloom maintenance is not as well understood. Over three field seasons (2015-2017), we collected water from western Lake Erie and employed bottle incubations with 15 N-ammonium (NH þ 4 ) enrichments to determine NH þ 4 regeneration and potential uptake rates in the water column. Potential NH þ 4 uptake rates followed spatial and seasonal patterns, with greatest rates measured nearest the Maumee River inflow and during peak bloom months (August and September). Regeneration followed a similar spatial pattern but was greatest in early summer (June and July) and supported $ 20-60% of potential NH þ 4 demand during the height of the bloom. Basinwide internal NH þ 4 regeneration during the April-October period could supply NH þ 4 at 60-200% of annual external N loading to the western basin. These results help explain how non-N-fixing cyanoHABs in Lake Erie and other large, eutrophic lakes continue producing biomass and N-rich toxins long after spring nutrient loads are exhausted or transported to other areas. Internal N loads are ultimately driven by external N loads; in low precipitation years, external nutrient loads result in smaller blooms, producing less substrate for subsequent internal N loads. Overall, these findings, along with others, confirm that both internal and external N loading must be considered when evaluating cyanoHAB management strategies.

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The role of amino acids in the nitrogen cycle of Lake Mendota1

Abstract: Concentrations of most dissolved free amino acids (DFAA)

Cited by 46 publications

References 15 publications

Free amino acids in lakes: Concentrations and assimilation rates in relation to phytoplankton and bacterial production1

Free amino acids in lakes: Concentrations and assimilation rates in relation to phytoplankton and bacterial production1

Nitrogen Fixation in Canadian Precambrian Shield Lakes

The role of internal nitrogen loading in supportingnon‐N‐fixing harmful cyanobacterial blooms in the water column of a large eutrophic lake

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