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  • 1
    Electronic Resource
    Electronic Resource
    Benthic–pelagic coupling in the population dynamics of the harmful cyanobacterium Microcystis (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 50 (2005), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. In eutrophic lakes, large amounts of the cyanobacterium Microcystis may overwinter in the sediment and re-inoculate the water column in spring.2. We monitored changes in pelagic and benthic populations of Microcystis in Lake Volkerak, The Netherlands. In addition, sedimentation rates and the rate of recruitment from the sediment were measured using traps. These data were used to model the coupling between the benthic and pelagic populations and to calculate the contribution of overwintering benthic and pelagic populations to the magnitude of the pelagic summer bloom.3. Changes in the benthic Microcystis population showed a time lag of 3–14 weeks compared with the pelagic population. This time lag increased with lake depth. The largest amount of benthic Microcystis was found in the deepest parts of the lake. These observations suggest horizontal transport of sedimented Microcystis from shallow to deep parts of the lake.4. Recruitment from and sedimentation to the sediment occurred throughout the year, with highest recruitment and sedimentation rates during summer. Model simulations indicate that the absence of benthic recruitment would reduce the summer bloom by 50%.5. In spring, the total pelagic population was three to six times smaller than the total benthic population. Yet, model simulations predict that the absence of this small overwintering pelagic population would reduce the summer bloom by more than 64%.6. Reduction of the overwintering pelagic populations, for instance by flushing, may be a useful management strategy to suppress or at least delay summer blooms of Microcystis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.2005.01368.x
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  • 2
    Electronic Resource
    Electronic Resource
    Diurnal buoyancy changes of Microcystis in an artificially mixed storage reservoir (1996)
    Springer
    Hydrobiologia 331 (1996), S. 131-141 
    Details
    ISSN: 1573-5117
    Keywords: buoyancy ; artificial mixing ; aeration ; Microcystis ; cyanobacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In a storage reservoir, which is artificially mixed in order to reduce algal and especially cyanobacterial growth, the cyanobacterium Microcystis is still present. The aim of the research was to investigate why Microcystis was able to grow in the artificially mixed reservoir. From the results it could be concluded that the large shallow area in the reservoir allows this growth. The loss of buoyancy during the day was much higher in this shallow part than in the deep part. Assuming that the loss of buoyancy was the result of a higher carbohydrate content, a higher growth rate in the shallow part may be expected. A higher received light dose by the phytoplankton in the shallow mixed part of the reservoir than in the deep mixed part explains the difference in buoyancy loss. A significant correlation between the received light dose (calculated for homogeneously mixed phytoplankton) and the buoyancy loss was found. Apparently, the Microcystis colonies were entrained in the turbulent flow in both the shallow and the deep part of the reservoir. With a little higher stability on one sampling day, due to the late start of the artificial mixing, the loss of buoyancy at the deep site was higher than on the other days and almost comparable to the loss at the shallow site. Although the vertical biomass distribution and the temperature profiles showed homogeneous mixing, the colonies in the upper layers apparently received a higher light dose than those deeper in the water column. Determination of the buoyancy state of cyanobacteria appeared to be a valuable method to investigate the light history and hence their entrainment in the turbulent flow in the water column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025414
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of dynamic light regimes on Chlorella II. Minimum quantum requirement and photosynthesis-irradiance parameters (1992)
    Springer
    Hydrobiologia 238 (1992), S. 79-88 
    Details
    ISSN: 1573-5117
    Keywords: dynamic light regime ; photosynthesis ; respiration ; quantum requirement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Comparisons were made of photosynthesis in three light limited cyclostat cultures (LD = 8:16, dilution rate 0.7 d−1) of Chlorella pyrenoidosa, differing only in the dynamics of irradiance supply: as a constant rate, i.e. a block culture; as a sine function of the light period, i.e. a sinusoidal culture; as an 8 h sine function superimposed by an 1 h sine function, i.e. an oscillating culture. The sinusoidal culture had a constant minimum quantum requirement for oxygen evolution (QR) of 10.8 over the photoperiod. The OR of the oscillating culture increased from 24 to 37 during the photoperiod. From changes in α and P max we suggest that: (1) photosynthetic units (PSU) of the block and sinusoidal sulture increased in number; (2) increasingly fewer chlorophyll molecules participated in oxygenic photosynthesis with a decreasing turnover time of the PSU's during an oscillating photoperiod. Values of I k decreased slightly in the block culture, increased slightly in the sinusoidal culture and showed a twofold increase in the oscillating culture. From the ratio of in situ oxygen production (qO2) and P max we infer a balanced equilibrium between photosystem activity and electron transport capacity for the block and sinusoidal culture. We hypothesize that the qO2 values of the oscillating culture underestimated true oxygen production rates due to a nonlinear response at peak light intensities. The results show that a dynamical photoperiod provoked significantly different photosynthetic responses, even though the overall growth rate was unaffected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00048776
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  • 4
    Electronic Resource
    Electronic Resource
    Modelling vertical migration of the cyanobacterium Microcystis (1997)
    Springer
    Hydrobiologia 349 (1997), S. 99-109 
    Details
    ISSN: 1573-5117
    Keywords: Microcystis ; vertical migration ; buoyancy ; modelling ; fluctuating irradiance ; carbohydrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Computer models can be helpful tools to provide abetter understanding of the mechanisms responsible forthe complex movements of cyanobacteria resulting fromchanges in buoyancy and mixing of the water column ina lake. Kromkamp & Walsby (1990) developed a verticalmigration model for Oscillatoria, that wasbased on the experimentally determinedrelationship between the rates of density change andphoton irradiance in this cyanobacterium. To adaptthis model to Microcystis, we determinedrelated changes in carbohydrate content in cultures ofMicrocystis. Samples were incubated at variousconstant values of photon irradiance and then placedin the dark. The changes in carbohydrate content ofthe cells during these incubations were investigated.The relationship between the ratio of carbohydrate toprotein and cell density in Microcystis wasestablished to permit conversion of the rates ofcarbohydrate change to rates of density change. Byplotting the calculated rates of density changeagainst the values of photon irradiance experiencedduring the incubations, an irradiance-response curveof density change was established. The curve showed adistinct maximum at 278 µmol photons m-2s-1. At higher values of photon irradiance, therate of density change was strongly inhibited. Apositive linear correlation was found between celldensity and the rates of density decrease in the dark.The validity of the use of rate equations of densitychange, which are based on short-term incubations atconstant values of photon irradiance, to predictdensity changes in Microcystis in fluctuatinglight regimes was tested. This was accomplished bymeasuring the time course of change in carbohydratecontent of two continuous cultures of Microcystis, which were submitted to fluctuatinglight regimes, and comparing the results with thechanges in the carbohydrate contents of these culturespredicted by the rate equations of carbohydratechange. The results showed good agreement: the rateequations of density change were therefore introducedinto the model to simulate vertical migration of Microcystis. The model predicts that the maximummigration depth of Microcystis will increasewith colony size up to a maximum of 200 µm radius.The effect of colony size on the net increase in celldensity during the light period was also investigatedwith the model. It predicts that small colonies havea higher net increase in cell density than largecolonies, but are inhibited at high photon irradiancesat the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003001713560
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  • 5
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    Pigments concentration of Holocene sedimentary from Lake Uddelermeer (2023)
    PANGAEA
    Details
    Publication Date: 2024-04-17
    Keywords: AGE; Alloxanthin, per unit mass total organic carbon; Chlorophyll a, per unit mass total organic carbon; Chlorophyll b, per unit mass total organic carbon; DEPTH, sediment/rock; Diatoxanthin, per unit mass total organic carbon; High Performance Liquid Chromatography (HPLC); Holocene; Lake sediment; Lutein, per unit mass total organic carbon; Netherlands; PCUWI; pigments; Piston corer, UWITEC; stanols; sterols; UDD-E; Uddelermeer, Netherlands
    Type: Dataset
    Format: text/tab-separated-values, 552 data points
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  • 6
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    Holocene sedimentary sterol and stanol concentrations from Lake Uddelermeer (2023)
    PANGAEA
    Details
    Publication Date: 2024-04-17
    Keywords: 24-ethyl-5b-Cholestan-3a-ol, per unit mass total organic carbon; 24-Ethylcoprostanol, per unit mass total organic carbon; 5a-Campestanol, per unit mass total organic carbon; 5a-Stigmastanol, per unit mass total organic carbon; 5beta-Campestanol, per unit mass total organic carbon; 5beta-Stigmastanol, per unit mass total organic carbon; AGE; beta-Sitosterol, per unit mass total organic carbon; Carbon, organic, total; Cholestanol, per unit mass total organic carbon; Cholesterol, per unit mass total organic carbon; Coprosterol, per unit mass total organic carbon; DEPTH, sediment/rock; Epi-coprostanol, per unit mass total organic carbon; Gas chromatography - Mass spectrometry (GC-MS); Holocene; Lake sediment; Netherlands; PCUWI; pigments; Piston corer, UWITEC; stanols; sterols; Stigmasterol, per unit mass total organic carbon; UDD-E; Uddelermeer, Netherlands
    Type: Dataset
    Format: text/tab-separated-values, 390 data points
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  • 7
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    Elemental (C, N) measurements of Holocene sedimentary from Lake Uddelermeer (2023)
    PANGAEA
    Details
    Publication Date: 2024-04-17
    Keywords: AGE; Calculated; Carbon; DEPTH, sediment/rock; Holocene; Lake sediment; Netherlands; Nitrogen; PCUWI; pigments; Piston corer, UWITEC; stanols; sterols; UDD-E; Uddelermeer, Netherlands
    Type: Dataset
    Format: text/tab-separated-values, 184 data points
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  • 8
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    Sedimentary pigment, sterol and stanol data for the Holocene record of Lake Uddelermeer (The Netherlands) (2023)
    PANGAEA
    Details
    Publication Date: 2024-04-17
    Description: This dataset provides geochemistry data for the Holocene sediment sequence retrieved from Lake Uddelermeer (The Netherlands) in 2012. Concentrations of sedimentary pigments, fossil sterols and stanols as well as elemental (C, N) measurements are presented against both depth (cm) and age (cal yr. BP). A total of 92 samples were analysed for C, N and sedimentary pigment content; a subset of 30 samples was analysed for sterol and stanol compounds. The data provides an insight in the natural variability of the lake ecosystem and has been used to identify the anthropogenic drivers of the change to the turbid conditions that currently characterize this lake. Cores were retrieved from the centre of the lake using a 3-m long handheld piston corer deployed from a floating coring platform during field work in April and May 2012. Samples were obtained from splits of the core and processed in the laboratory of the University of Amsterdam (the Netherlands) using standard protocols, including the use of high performance liquid chromatography (HPLC) to determine sedimentary pigment concentrations and full scan as well as selective ion monitoring (SIM) gas chromatography-mass spectrometry (GC–MS) analysis to determine sterol and stanol concentrations. Name of the Campaign: UDD Event Label: UDD-E Method: Uwitec piston corer Latitude: 52.24652778 Longitude: 5.76097222 Elevation: 24m asl Date/Time of event: 2012-05-01T14:00:00 Further information about event: Lake sediment sequence retrieved using a 60 mm piston corer deployed from a floating platform.
    Keywords: Holocene; Lake sediment; Netherlands; pigments; stanols; sterols
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 9
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    Artificial mixing to control cyanobacterial blooms: a review (2015)
    Springer
    Details
    Publication Date: 2015-08-19
    Print ISSN: 1386-2588
    Electronic ISSN: 1573-5125
    Topics: Biology
    Published by Springer
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  • 10
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    Cyanobacterial blooms. Ecology, prevention, mitigation and control: Editorial to a CYANOCOST Special Issue (2016)
    Springer
    Details
    Publication Date: 2016-08-25
    Print ISSN: 1386-2588
    Electronic ISSN: 1573-5125
    Topics: Biology
    Published by Springer
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