OPTIMUM N:P RATIOS AND COEXISTENCE OF PLANKTONIC ALGAE<sup>1</sup>

Rhee, G‐Yull; Gotham, Ivan J.

doi:10.1111/j.1529-8817.1980.tb03065.x

Cited by 299 publications

(163 citation statements)

References 18 publications

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“…The unequal distribution is quite likely to be caused by different storage capacities for nitrogen and phosphorus. It is known that storage capacity relative to subsistence cell quotas is much greater for phosphorus than for nitrogen (Goldman & Peavey 1979;Rhee & Gotham 1980). The data in the present study suggest a storage capacity for phosphorus of c. X5 the subsistence level, and that for nitrogen may be only c. X0.5, values which are much lower than have been reported to occur in continuous cultures (Goldman & McCarthy 1978).…”

Section: Discussioncontrasting

confidence: 50%

Nutrient demand and availability among planktonic communities — an attempt to assess nutrient limitation to plant growth in 12 central volcanic plateau lakes

White

Law

Payne

et al. 1985

New Zealand Journal of Marine and Freshwater Research

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Four assays of nitrogen demand and 3 for phosphorus were employed in 12 lakes at 4 seasons in an attempt to identify the nutrients limiting plankton growth. Orthophosphate turnover times, chlorophyll, and a range of analyses for nitrogen and phosphorus were made in support of the bioassays. Consideration was given to both statistical and biological interpretation of the assays. It was not possible to identify with certainty the limiting nutrients from this information, but criteria were developed which allowed conclusions to be drawn about plankton nutrient sufficiency. Differential storage capacity relative to subsistence cell quota for the 2 nutrients needs to be considered when interpreting the bioassays.

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Section: Discussioncontrasting

confidence: 50%

Nutrient demand and availability among planktonic communities — an attempt to assess nutrient limitation to plant growth in 12 central volcanic plateau lakes

White

Law

Payne

et al. 1985

New Zealand Journal of Marine and Freshwater Research

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“…In the case of N : P ratios there are wide interspecific variations from as low as 3 in Melosira to as high as 20 in Scenedesmus sp. (Rhee & Gotham 1980). Among the cyanobacteria there is also a wide range (Table 2).…”

Section: Laboratory Experiments and Theoretical Considerationsmentioning

confidence: 99%

The role of macronutrients (C, N, P) in controlling cyanobacterial dominance in temperate lakes

Pick

Lean²

1987

New Zealand Journal of Marine and Freshwater Research

120

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Cyanobacteria are the only group of phytoplankton to show a clear increase both in biomass and relative contribution to total phytoplankton biomass as temperate lakes become eutrophic. Correlative studies indicate that this increase begins at total phytoplankton biomass levels of 3-5 mg fresh weight l -1 or spring total phosphorus (TP) concentrations of 25-30 μg l -1 . Above TN : TP ratios of 30, cyanobacteria tend to become rare, but below this value they may or may not dominate. Better predictions may be possible by attempting to remove the influence of the refractory dissolved organic nitrogen and phosphorus fractions by using the TN-DON : TP-DOP ratio. While experimental manipulation of N : P ratios in enclosures or entire lakes may often stimulate or suppress relative cyanobacterial biomass, laboratory studies do not clearly link low N : P ratios with cyanobacteria. Evidence from correlative studies, long-term records of individual lakes, and experimental manipulations of nutrient loads suggest that other factors such as temperature, mixing regimes, transparency, and iron or carbon availability may influence cyanobacterial dominance in lakes.

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“…Water depth at the station was 100 m and the temperature was 5.6"C at the surface and uniform at 5.2" below 20 m. Typical nutrient concentrations for this location and time of year are 0.06 PM SRP, 0.10 PM TDP, 18.5 PM reactive Si, 2 1.3 PM N03-, and 0.3 1 PM NH3 (Eadie et al 1977;Rockwell et al 1980). Molar ratios of nutrient supply (Si:P = 155, N:P = 152 from lake water plus medium) were indicative of P limitation (Rhee and Gotham 1980;Tilman and Kilham 1976;Tilman 198 1).…”

Section: Semicontinuousmentioning

confidence: 99%

Small‐scale nutrient patchiness: Some consequences and a new encounter mechanism1

Scavia

Fahnenstiel

Davis

et al. 1984

Limnology & Oceanography

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Semicontinuous cultures of Lake Michigan algal assemblages were run at O.l5*day-' dilution rates under P limitation for 41 days. In control cultures, nutrients were supplied to the entire culture once per day. In patch cultures, 10% of the cultures received a high concentration IO-min pulse each day. Patch and control cultures received equal nutrient flux and achieved equal biomass levels; however, their species composition was different. Patch cultures were dominated by the filamentous blue-green alga Schizothrix calcicola and control cultures were dominated equally by S. calcicolu, Nitzschia aciculuris, and a group of phytoflagellates. These results, as well as shifts in subdominants, demonstrate the effect of small-scale, short term nutrient patches on species composition. Similar patch and control unialgal cultures revealed lower cell nutrient quotas for patchy cultures.Microvideographic observations of Daphnia magna suspended in three concentrations of Chlamydomonas sp. allowed quantification of rates at which algal cells were collected, swept close by, and released via bolus rejection or outwashing of unpacked cells. Outwashing release rates of presumably unharmed cells increased from 3 1 to 7 1% of the collection rate as food concentration increased. It appears that algal outwashing is a significant mechanism for eliminating excess food. An important implication is the potential algal nutritional consequence of this very close nondestructive encounter.

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OPTIMUM N:P RATIOS AND COEXISTENCE OF PLANKTONIC ALGAE¹

Cited by 299 publications

References 18 publications

Nutrient demand and availability among planktonic communities — an attempt to assess nutrient limitation to plant growth in 12 central volcanic plateau lakes

Nutrient demand and availability among planktonic communities — an attempt to assess nutrient limitation to plant growth in 12 central volcanic plateau lakes

The role of macronutrients (C, N, P) in controlling cyanobacterial dominance in temperate lakes

Small‐scale nutrient patchiness: Some consequences and a new encounter mechanism1

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OPTIMUM N:P RATIOS AND COEXISTENCE OF PLANKTONIC ALGAE1

Cited by 299 publications

References 18 publications

Nutrient demand and availability among planktonic communities — an attempt to assess nutrient limitation to plant growth in 12 central volcanic plateau lakes

Nutrient demand and availability among planktonic communities — an attempt to assess nutrient limitation to plant growth in 12 central volcanic plateau lakes

The role of macronutrients (C, N, P) in controlling cyanobacterial dominance in temperate lakes

Small‐scale nutrient patchiness: Some consequences and a new encounter mechanism1

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OPTIMUM N:P RATIOS AND COEXISTENCE OF PLANKTONIC ALGAE¹