Nitrate and ammonium uptake by plankton in an Amazon River floodplain lake

Fisher, Thomas; Morrissey, Kevin M.; Carlson, Paul R.; Alves, Luiz Fernando; Mélack, John M.

doi:10.1093/plankt/10.1.7

Cited by 20 publications

(12 citation statements)

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“…However, in the stratified waters of the Strait of Georgia, Price et al (1985) found that VD:VL for NO: and urea demonstrated both diel and diurnal variability. Diurnal (daytime) variability in the VD:VL of NHZ uptake by freshwater phytoplankton assemblages of Lake Calado (Fisher et al 1988) and the South River estuary (Fisher et al 1982) has also been observed. In the present study, all the experiments were conducted at approximately the same time of day, thereby compensating for any diurnal variability in N uptake (either independent of or dependent on the daily light cycle) and thus permitting comparisons between stations.…”

Section: Dark Nitrogen Uptakementioning

confidence: 85%

Effects of irradiance on nitrogen uptake by phytoplankton: comparison of frontal and stratified communities

Cochlan¹,

Price²,

Harrison³

1991

Mar. Ecol. Prog. Ser.

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Section: Dark Nitrogen Uptakementioning

confidence: 85%

Effects of irradiance on nitrogen uptake by phytoplankton: comparison of frontal and stratified communities

Cochlan¹,

Price²,

Harrison³

1991

Mar. Ecol. Prog. Ser.

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“…The results of these studies show generally that, given the uncertainties in both nutrient demand and zooplankton supply, the supply by regeneration is essentially in balance with the demand by phytoplankton (e.g. Barlow and Bishop 1965;Fisher et Changing views of P dynamics in the epilimnion of Mirror Lake. 1 -Prior to the direct estimate of new production our view was that P inputs to surface waters were low in summer and that algal P demand was almost entirely met by recycling.…”

Section: Discussionmentioning

confidence: 99%

New and recycled primary production in an oligotrophic lake: Insights for summer phosphorus dynamics

Caraco

Cole

Likens

1992

Limnology & Oceanography

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Primary production that is supported by new inputs of nutrients from outside the system is distinct from production that is supported by remineralization of nutrients within the system. We applied the concept of new production to Mirror Lake, New Hampshire, and our view of P dynamics in this lake was altered dramatically. New production during midsummer put a large demand on P in surface waters, removing 37 µmol P m−2 d−1. Without new inputs of P, the P content of surface waters would drop to zero in < 1 month. There is, however, a slight increase, not a decrease, in P content of surface waters during summer stratification. Inputs to surface waters during summer months must, therefore, be large. We now believe that higher than average P loading to the lake occurs in summer, despite low runoff inputs.

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“…Low concentration of dissolved inorganic nitrogen (DIN) is a necessary but insufficient condition for the diagnosis of N limitation, since half-saturation constants for DIN uptake by some algal species and phytoplankton communities can be as low as 2 mg m-3 (Murphy 1980;Halterman and Toetz 1984;Fisher et al 1988). Low DIN can be particularly misleading in the case of shallow and turbid tropicalsubtropical floodplain lakes where warm temperatures and high ratios of sediment surface to lake volume promote high denitrification rates.…”

mentioning

confidence: 99%

Recognition of nutrient and light limitation in turbid mixed layers: Three approaches compared in the Parani floodplain (Argentina)

Carignan

Planas

1994

Limnol. Oceanogr.

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The potential difficulties of testing for nutrient limitation in turbid mixed layers are illustrated by comparing the outcome of three different approaches (in vitro bioassays, limnocorrals, and whole-lake fertilization)in the subtropical ParanL floodplain. Bioassays of the planktonic communities consistently suggested acute N limitation, no limitation, or P limitation, depending on the time at which we chose to terminate the experiment. Enclosures (17 m*) deployed in one lake indicated N limitation but increased sedimentation and water transparency in the enclosures. Although short-term bioassays consistently indicated limitation by N, whole-lake fertilization produced only a small and transient increase in chlorophyll a and primary production or no response at all. Some lakes are mildly limited by N during summer; others appear to be limited by light. In the latter, bioassays and whole-lake fertilization lead to inconsistent conclusions. A steady state model of phytoplankton biomass (as Chl a) under excess nutrient concentrations is proposed to facilitate the diagnosis of light limitation in shallow and turbid water bodies. Model predictions are consistent with mean column critical irradiance (PAR) of 1.6 MJ m-2 d-l (7.36 Einst m-2 d-l) previously reported for net phytoplankton growth in marine and freshwater systems.

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Nitrate and ammonium uptake by plankton in an Amazon River floodplain lake

Cited by 20 publications

References 0 publications

Effects of irradiance on nitrogen uptake by phytoplankton: comparison of frontal and stratified communities

Effects of irradiance on nitrogen uptake by phytoplankton: comparison of frontal and stratified communities

New and recycled primary production in an oligotrophic lake: Insights for summer phosphorus dynamics

Recognition of nutrient and light limitation in turbid mixed layers: Three approaches compared in the Parani floodplain (Argentina)

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