Stability and change of phytoplankton communities in a highly dynamic environment—the case of large, shallow Lake Balaton (Hungary)

Honti, Márk; Istvánovics, Vera; Osztoics, András

doi:10.1007/s10750-006-0508-2

Cited by 26 publications

(8 citation statements)

References 26 publications

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“…However, biomass values were lower than those reported for shallow, eutrophic, subtropical lakes (Rücker et al, 1997;Honti et al, 2007) and other shallow tropical reservoirs with the same trophic state Crossetti and Bicudo, 2008).…”

Section: Discussioncontrasting

confidence: 69%

Dynamics of phytoplankton associations in three reservoirs in northeastern Brazil assessed using Reynolds’ theory

Dantas

Bittencourt‐Oliveira

2012

Limnologica

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a b s t r a c tThe aim of the present study was to evaluate the influence of seasonality on the behavior of phytoplankton associations in eutrophic reservoirs with different depths in northeastern Brazil. Five collections were carried out at each of the reservoirs at two depths (0.1 m and near the sediment) at three-month intervals in each season (dry and rainy). The phytoplankton samples were preserved in Lugol's solution and quantified under an inverted microscope for the determination of density values, which were subsequently converted to biomass values based on cellular biovolume and classified in phytoplankton associations. The following abiotic variables were analyzed: water temperature, dissolved oxygen, pH, turbidity, water transparency, total phosphorus, total dissolved phosphorus, orthophosphate and total nitrogen. The data were investigated using canonical correspondence analysis. The influence of seasonality on the dynamics of the phytoplankton community was lesser in the deeper reservoirs. Depth affected the behavior of the algal associations. Variation in light availability was a determinant of changes in the phytoplankton structure. Urosolenia and Anabaena associations were more abundant in shallow ecosystems with a larger eutrophic zone, whereas the Microcystis association was more related to deep ecosystems with adequate availability of nutrients. The distribution of Cyclotella, Geitlerinema, Planktothrix, Pseudanabaena and Cylindrospermopsis associations was different from that seen in subtropical regions and the substitution of these associations was related to a reduction in the eutrophic zone rather than the mixture zone.Published by Elsevier GmbH.

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Section: Discussioncontrasting

confidence: 69%

Dynamics of phytoplankton associations in three reservoirs in northeastern Brazil assessed using Reynolds’ theory

Dantas

Bittencourt‐Oliveira

2012

Limnologica

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“…The interannual stability of weekly NPP between late spring and late July (Fig. c, Week 15–30) was consistent with the observation of Honti et al () that in the lack of a sufficiently long‐lasting unidirectional selective pressure, phytoplankton were in a “ground state” characterized by low biomass and hectic compositional changes. In contrast, variability of weekly NPP from late July reflected year‐to‐year variability of growth conditions in blooming sub‐spaces of phytoplankton identified by Honti et al ().…”

Section: Discussionsupporting

confidence: 89%

Coupled simulation of high‐frequency dynamics of dissolved oxygen and chlorophyll widens the scope of lake metabolism studies

Istvánovics

Honti

2017

Limnology & Oceanography

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High frequency time series of dissolved oxygen (DO), delayed chlorophyll fluorescence (Chl) and relevant background variables were recorded on nearly 900 d during 7 yr in large, shallow, meso-eutrophic Lake Balaton (Hungary). Novel models were developed for coupled simulation of diel dynamics of DO and Chl using sequential learning and uncertainty assessment in a Bayesian framework. Despite the generally good model fit for both variables, the uncertainty of the metabolic estimates was high, due primarily to the identification problem of individual metabolic processes. Deviations between observed and simulated DO concentrations suggested that neglect of transient stratification might be responsible for the bulk of the systematic model errors. Net ecosystem production (NEP) was uncertain. Unless air-water oxygen exchange can be estimated from direct measurements, the free-water DO method cannot reliably estimate NEP. Gross primary production (GPP) could satisfactorily be hindcasted assuming non-linear multiplicative dependence on Chl, water temperature and light. Hindcast of community respiration (CR) was less successful, possibly due to the impact of local benthic respiration. Results suggested a major shift in lake metabolism at about 168C. Below and above this temperature, 70% and 90% of net primary production could be utilized by heterotrophs within a day, respectively. Indirect evidence suggested that biomass-specific net primary production was determined by phosphorus. The large difference between reproductive rates and net growth rates estimated from GPP and Chl and from daily change in Chl, respectively indicated that loss rates of phytoplankton were as important determinants of algal dynamics as reproductive rates.

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“…This fine resolution information allowed for selection of sampling depths that were truly representative for the subsurface chlorophyll maximum. Recently, a similar technique based on delayed fluorescence excitation spectroscopy was applied to follow dynamics of different phytoplankton groups in shallow Lake Balaton, Hungary (Istvµnovics et al, 2005;Honti et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

The effect of extreme rainfall on summer succession and vertical distribution of phytoplankton in a lacustrine part of a eutrophic reservoir

Znachor

Zapomělová²,

Řeháková

et al. 2008

Aquat. Sci.

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During the summer of 2006, phytoplankton succession and vertical distribution were studied in the eutrophic Ř ímov Reservoir (Czech Republic). Disturbances in the form of dramatic summer storms had a crucial effect on phytoplankton succession and its vertical distribution. Two extreme rainfalls substantially increased flushing rate, yielding a fairly short retention time within the reservoir that disrupted established thermal stratification. The first storm initiated the development of summer phytoplankton, while the second storm reversed the phytoplankton succession to an earlier stage. The measurement of vertical profiles of chlorophyll a showed that the phytoplankton were heterogeneously distributed in the water column and formed subsurface diatom maxima (SDM) over most of the summer. Biogenic silica deposition studied by PDMPO (2-(4-pyridyl)-5{[4-dimethylaminoethyl-aminocarbamyl)-methoxy] phenyl}oxazole) was measured to compare diatom growth rates over the season and between surface and depth of SDM. Diatoms deposited 20 times more silica at the surface than at the SDM depth, although only a half of diatom population was involved in the silica deposition. Maximum rates of silica deposition were measured in samples just after both summer storms events. When diatoms dominated the phytoplankton, the amounts of available Si and P in water were significantly correlated (r 2 = 0.81, p < 0.001, df = 42). Outliers from the linear relationship were found only during a period when substantial picocyanobacterial population developed in the reservoir. Due to their lack of Si requirements, ambient Si concentration markedly increased while P was depleted to growth limiting levels. Temporal variations in Si:P ratio therefore illustrate the importance of resource competition in phytoplankton seasonal succession.

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Stability and change of phytoplankton communities in a highly dynamic environment—the case of large, shallow Lake Balaton (Hungary)

Cited by 26 publications

References 26 publications

Dynamics of phytoplankton associations in three reservoirs in northeastern Brazil assessed using Reynolds’ theory

Dynamics of phytoplankton associations in three reservoirs in northeastern Brazil assessed using Reynolds’ theory

Coupled simulation of high‐frequency dynamics of dissolved oxygen and chlorophyll widens the scope of lake metabolism studies

The effect of extreme rainfall on summer succession and vertical distribution of phytoplankton in a lacustrine part of a eutrophic reservoir

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