Phosphate uptake capacity of summer phytoplankton of the Loosdrecht Lakes in relation to phosphorus loading and irradiance

Sweerts, Jean-Pierre R. A.; Gons, Herman J.; Rijkeboer, Machteld

doi:10.1007/bf02291155

Cited by 10 publications

(3 citation statements)

References 18 publications

(8 reference statements)

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“…Although in 1984 chlorophyll concentration was lower than in 1983 ( VAN LI ERE etaL, 1986), there was no improvement in water transparency, and total P concentrations increased (BOERS and VAN LIERE, 1985). Preliminary results for 1985 are similar to those for theprevious year; moreover, contrary to conclusions reached for 1983 (RIEGMAN, 1985), studies indicated that in summer 1985 the phytoplankton was not phosphorus-but light-limited (SWEERTS et al, 1986).…”

Section: Introductioncontrasting

confidence: 48%

The eutrophic Loosdrecht Lakes: Current ecological research and restoration perspectives

Gons¹,

Gulati²,

Liere³

1986

Hydrobiological Bulletin

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Features of the Loosdrecht Lakes, with emphasis on the main lake, are discussed with reference to restoration.Characteristics of the present situation are : (1) very low water transparency -Secchi-disc readings around 0.3 m occur in all seasons; (2) relatively small seasonal changes in sestonic matter; (3) important input of resuspended particles into the seston; (4) predominance of filamentous blue-green algae for most of the year; (5) relative scarcity of crustacean zooplankton, while rotifers are abundant; (6) poor development of littoral communities, and absence of benthic producers. The blue-green algae maintain high population density at very low growth rates : rates of loss are low. The zooplankton grazing rate is low due to inefficient filtering, but predation of larger crustaceans by fish may also be important. Studies on epipelon indicated that loss by deposition may be largely compensated by resuspension.Starting in 1984, the external phosphorus loading was markedly reduced. Results for 1984 and 1985 indicate that complementary measures are needed in order to improve water quality. Action should be directed towards increasing the phytoplankton turnover rates. Accelerated specific growth rate can be expected to accompany lower biomass, more successful competition by other algal groups, and enhancement of grazing pressure.Considering the shallowness of the system, promotion of littoral development and return of submerged vegetation may be important in establishing a new equilibrium of the system.

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Section: Introductioncontrasting

confidence: 48%

The eutrophic Loosdrecht Lakes: Current ecological research and restoration perspectives

Gons¹,

Gulati²,

Liere³

1986

Hydrobiological Bulletin

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“…For 1985 and 1986 it now seems indubitable that light had been growth-limiting, even more so since laboratory results demonstrated that phosphate supply had no effect on the dynamics of chlorophyll a (Sweerts et al, 1986 ;Van Liere, 1986b) .…”

Section: Resultsmentioning

confidence: 99%

“…It was surmised that light had been growth-limiting (Sweerts et al ., 1986 ;Van Liere, 1986b). It was surmised that light had been growth-limiting (Sweerts et al ., 1986 ;Van Liere, 1986b).…”

Section: Introductionmentioning

confidence: 99%

Algal growth and loss rates in Lake Loosdrecht: first evaluation of the roles of light and wind on a basis of steady state kinetics

Gons¹,

Rijkeboer²

1990

Hydrobiologia

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Lake Loosdrecht (The Netherlands) is shallow, highly eutrophic and subject to frequent wind-induced resuspension of settled algae and detritus . The summer phytoplankton consists of filamentous prokaryotic species . Chlorophyll a levels are rather stable over the summer at a concentration of ca. 160 mg m -3 ;losses due to grazing and sinking are small . Epipelic chlorophyll a concentrations range from 0 to 250, but ca . 50 mg m -2 is typical . In situ rates of change of chlorophyll a in the water column were related to specific growth rates predicted by a model for light-limited growth . In the model, incident light is partitioned among algae, tripton and background colour, to determine the light available for algal growth and cell maintenance . Model coefficients were derived primarily from laboratory studies of the growth of Prochlorothrix hollandica, an abundant species in the lake in summer . Presuming constant rates of loss due to grazing and sinking, for summers 1985 and 1986 some 56% of the variation in the chlorophyll a in the lake water was explained by change in light conditions alone and 77% by light and wind-driven resuspension of epipelic chlorophyll a together . These factors had little influence on the phytoplankton biomass in 1983 and 1984 ; other environmental conditions, e .g. phosphorus availability, may have been important . Also, the laboratory-derived growth kinetics of P. hollandica may not have been equally suitable for modelling in the four summers . Fig. 2 . Daily insolation (kJ m -' day'), resuspension frequency (% lake area day -' ), and concentrations of sestonic dry weight (g m -3 ), sestonic chlorophyll a (mg m -3 ) and epipelic chlorophyll a (mg m -2 ) of L. Loosdrecht during summers 1983-1986 .

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Light-limited algal growth in Lake Loosdrecht: steady state studies in laboratory scale enclosures

Rijkeboer¹,

Gons²

1990

Trophic Relationships in Inland Waters

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Phosphate uptake capacity of summer phytoplankton of the Loosdrecht Lakes in relation to phosphorus loading and irradiance

Cited by 10 publications

References 18 publications

The eutrophic Loosdrecht Lakes: Current ecological research and restoration perspectives

The eutrophic Loosdrecht Lakes: Current ecological research and restoration perspectives

Algal growth and loss rates in Lake Loosdrecht: first evaluation of the roles of light and wind on a basis of steady state kinetics

Light-limited algal growth in Lake Loosdrecht: steady state studies in laboratory scale enclosures

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