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  • 1
    Electronic Resource
    Electronic Resource
    Effects of iron and chelation on Lake Kinneret bacteria (1993)
    Springer
    Microbial ecology 26 (1993), S. 1-8 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The response of natural populations of bacteria (prepared by passing Lake Kinneret water through 1 μm filters) to additions of Fe2+ and/or the chelator ethylenediaminetetraacetic acid (EDTA) was followed by measuring the incorporation of 3H-thymidine into 〉0.2 μm particulates, and also by determining the increments in cell numbers after 24 h. In most cases, a stimulation of 3H-thymidine incorporation was observed in supplemented samples relative to untreated controls after 3 and 24 h incubation. The increase in bacterial numbers was also enhanced by these supplements. Generally, EDTA alone evoked a greater stimulation than Fe2+; combined supplements gave no further increase. This response pattern appeared consistently throughout the year in samples taken from near-surface lake waters. These results suggest that the availability of iron or chelators may play an important role in regulating bacterial metabolism and growth even in aquatic ecosystems like Lake Kinneret where ambient concentrations of total Fe are relatively high.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166024
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  • 2
    Electronic Resource
    Electronic Resource
    Mutual interferences in the determination of Zn(II) and Cu(II) in seawater by anodic stripping voltammetry
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 125 (1981), S. 295-306 
    Details
    ISSN: 0368-1874
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0368-1874(81)87168-7
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  • 3
    Electronic Resource
    Electronic Resource
    Iron in the Dead Sea
    Amsterdam : Elsevier
    Earth and Planetary Science Letters 71 (1984), S. 405-414 
    Details
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0012-821X(84)90106-7
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  • 4
    Electronic Resource
    Electronic Resource
    The geochemistry of manganese in the Dead Sea
    Amsterdam : Elsevier
    Earth and Planetary Science Letters 71 (1984), S. 415-426 
    Details
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0012-821X(84)90107-9
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  • 5
    Electronic Resource
    Electronic Resource
    Mutual interferences in the determination of Zn(II) and Cu(II) in seawater by anodic stripping voltammetry
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 125 (1981), S. 295-306 
    Details
    ISSN: 0022-0728
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0022-0728(81)80348-8
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  • 6
    Electronic Resource
    Electronic Resource
    The response of the sedimentological regime in Lake Kinneret to lower lake levels (1996)
    Springer
    Hydrobiologia 339 (1996), S. 149-160 
    Details
    ISSN: 1573-5117
    Keywords: lake level ; Seiche ; sediment resuspension and focusing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The surface level of Lake Kinneret is regulated to remain between −209 m and −213 m msl. During the stratified period, soluble reactive phosphorus (SRP), ammonium (NH inf4 sup+ ) and dissolved sulphide (H2S) accumulate in the hypolimnion. The concentration of these solutes, which are direct and indirect products of the decomposition of organic matter, increase considerably in summers with lower lake levels. A numerical model describing depth-averaged hypolimnion and epilimnion current velocities for high and low lake levels was adapted for Lake Kinneret. Simulated hypolimnetic currents were shown to be stronger for low lake levels as a result of the fact that low lake levels are characterized by a thinner hypolimnion while the thickness of the epilimnion remains unchanged. We suggest that the stronger hypolimnetic currents have the following consequences: 1. turbulence is induced, 2. the enhanced turbulence results in higher resuspension, 3. because SO4= is available to bacteria on resuspended particles, mineralization rates are enhanced, and 4. focusing of fine sediments and associated organic matter to the pelagic zone is enhanced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008923
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  • 7
    Electronic Resource
    Electronic Resource
    Spatial Distributions of Biogeochemical Parameters in Surface Sediments (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 497-505 
    Details
    ISSN: 1573-2932
    Keywords: surface sediments ; spatial distribution ; Chl a & c ; C, N & P ; bacterial activity ; Lake Kinneret
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The spatial variability of several sedimentological, chemical and biological parameters in the uppermost layer of bed sediment (ULBS) in Lake Kinneret, was studied during the development of anoxic conditions in the hypolimnion (May, 1995). ULBS samples were taken along a transect from the littoral to the pelagic zones, during the crash of the Peridinium gatunense bloom, about 2 months after the onset of stratification and when oxygen in the hypolimnion was almost completely depleted. The 2-3mm of the ULBS, collected by SCUBA diver, contained relatively fresh material (as shown by high Chl c content) but differed from that of intact Peridinium cells. In the ULBS, the C:N atomic ratio averaged 8 and was similar all over the lake bottom and the average Chlorophyll a:c ratio was 4 (reaching a value of ~7 at 5m). These ratios in Peridinium cells were about 14.3 and 2, respectively. In addition, δ 13C in the organic matter from the ULBS was lighter than that of Peridinium. This data suggests that substantial degredation of the organic matter already occurs in the water column. Grain size distribution suggests the occurance of intense focussing processes in Lake Kinneret. Chemical and biological parameters in the ULBS exhibited clear depth dependent patterns, suggesting changes in physical and chemical processes occur. Three different zones can be distinguished in Lake Kinneret bottom sediments. a. The littoral oxic photic zone (down to 5-7m), which is influenced by intensive biodegredation and high turbulence. b. Transition zone (7-20m), with an oxic-photic gradient and developed focussing processes. c. Profundal, anoxic zone (〉20m), where all fine, settled, organic rich material concentrates and undergoes anaerobic decomposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018303826012
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  • 8
    Electronic Resource
    Electronic Resource
    Spatial distributions of biogeochemical parameters in surface sediments (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 497-505 
    Details
    ISSN: 1573-2932
    Keywords: surface sediments ; spatial distribution ; Chla &c ; C, N & P ; bacterial activity ; Lake Kinneret
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The spatial variability of several sedimentological, chemical and biological parameters in the uppermost layer of bed sediment (ULBS) in Lake Kinneret, was studied during the development of anoxic conditions in the hypolimnion (May, 1995). ULBS samples were taken along a transect from the littoral to the pelagic zones, during tile crash of thePeridmium gatunense bloom, about 2 months after the onset of stratification and when oxygen in the hypolimnion was almost completely depleted. The 2–3mm of the ULBS, collected by SCUBA diver, contained relatively fresh material (as shown by high Chl c content) but differed from that of intactPeridinium cells. In the ULBS, the C:N atomic ratio averaged 8 and was similar all over the lake bottom and the average Chlorophyll a c ratio was 4 (reaching a value of ∼7 at 5m). These ratios inPeridinium cells were about 14 3 and 2, respectively. In addition, δ12C in the organic matter from the ULBS was lighter than that ofPeridinium. This data suggests that substantial degredation of the organic matter already occurs in the water column. Grain size distribution suggests the occurance of intense focussing processes in Lake Kinneret. Chemical and biological parameters in the ULBS exhibited clear depth dependant patterns, suggesting changes in physical and chemical processes occur. Three different zones can be distinguished in Lake Kinneret bottom sediments a. The littoral oxic pholic zone (down to 5–7m), which is influenced by intensive biodegradation and high turbulence. b Transition zone (7–20m), with anoxic-photic gradient and developed focussing processes c. Profundal, anoxic zone (〉20m), where all line, settled, organic rich material concentrates and undergoes anaerobic decomposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02406889
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  • 9
    Electronic Resource
    Electronic Resource
    Factors Regulating the Flux of Phosphate at the Sediment - Water Interface of a Subtropical Calcareous Lake: a Simulation Study with Intact Sediment Cores (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 401-409 
    Details
    ISSN: 1573-2932
    Keywords: phosphorus ; P flux ; microbial activity ; redox ; simulation ; Lake Kinneret ; sediment ; accumulative P release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Different factors which interactively control the flux of soluble reactive phosphorus (SRP) at the sediment-water interface (SWI) of Lake Kinneret were studied seasonally. The influence of pH, Eh and microbial activity on SRP flux at the SWI was investigated by manipulating the conditions in the overlying water of intact sediment cores. The calculated diffusive SRP flux out of the sediment was lower in cores sampled during winter and spring than during the period of amixis. Potential SRP release, as measured in the absence of microbial activity, was strongly enhanced upon the transition from oxic to anoxic conditions indicating P release from iron(III)-bound phosphorus. In spring and summer cores, an enhanced SRP flux from sediments at pH 7 in comparison to pH 8 indicated P release from carbonate-bound P which sedimented previously as result of high pH values during the algal spring bloom. Microbial uptake at the SWI was the most important sink for SRP and no net-flux occured under oxic conditions. The higher net-flux of P under anoxic conditions was linked to carbon limitation of the bacteria at the SWI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018335305539
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  • 10
    Electronic Resource
    Electronic Resource
    Factors regulating the flux of phosphate at the sediment — water interface of a subtropical calcareous lake: A simulation study with intact sediment cores (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 401-409 
    Details
    ISSN: 1573-2932
    Keywords: phosphorus ; P flux ; microbial activity ; redox ; simulation ; Lake Kinneret ; sediment ; accumulative P release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Different factors which interactively control the flux of soluble reactive phosphorus (SRP) at the sediment water irterface (SWI) of Lake Kinneret were studied seasonally. The influence of pH, Eh and microbial activity on SRP flux at the SWI was investigated by manipulating the conditions in the overlying water of intact sediment cores. The calculated diffusive SRP flux out of the sediment was lower in cores sampled during winter and spring than during the period of amixis. Potential SRP release, as measured in the absence of microbial activity, was strongly enhanced upon the transition from oxic to anoxic conditions indicating P release from iron(III)-bound phosphorus. In spring and summer cores, an enhanced SRP flux from sediments at pH 7 in comparison to pH 8 indicated P release from carbonate-bound P which sedimented previously as result of high pH values during the algal spring bloom. Microbial uptake at the SWI was the most important sink for SRP and no net-flux occured under oxic conditions. The higher net-flux of P under anoxic conditions was linked to carbon limitation ofthe bacteria at the SWI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02406880
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