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  • Articles: DFG German National Licenses  (4)
  • acidic mining lakes  (2)
  • Cyanobacteria  (1)
  • cyanobacteria  (1)
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  • Articles: DFG German National Licenses  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Chrysophytes and chlamydomonads: pioneer colonists in extremely acidic mining lakes (pH 〈3) in Lusatia (Germany) (1998)
    Springer
    Hydrobiologia 369-370 (1998), S. 315-327 
    Details
    ISSN: 1573-5117
    Keywords: acidic mining lakes ; phytoplankton ; Chlamydomonas ; Ochromonas ; water chemistry ; limiting factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Twenty-three extremely acidic (pH between 2.5 and 3.5) mining lakes in Lusatia (Germany) were analysed in order to classify their hydrochemistries and to assist the understanding of phytoplankton colonization of these extreme environments. Neither morphometric nor physical parameters influence phytoplankton composition but determine the extent to which the nutrient supply supports the mass development of Chrysophyceae and Chlorophyceae in certain layers of the water (hypo- or epilimnetic chlorophyll maxima and short mass developments). Conventional trophic classification is not readily applicable to these lakes but a chemical classification on the basis of hydrogen, total iron and acidity is proposed. Species of Ochromonas and Chlamydomonas dominate the phytoplankton in fourteen of the most acid lakes; dinoflagellates occurre additionally in four; a more diverse algal assemblage with diatoms and cryptophytes is found in lakes with moderately acidic (pH 5.7–7.0) or alkaline conditions (pH 7.0–9.4). The lake chemistry is the main determinant for the planktonic composition of the water bodies whereas the trophic state mainly determines the level of algal biomass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017010229136
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Why ’very shallow‘ lakes are more successful opposing reduced nutrient loads (1997)
    Springer
    Hydrobiologia 342-343 (1997), S. 269-284 
    Details
    ISSN: 1573-5117
    Keywords: shallow lakes ; eu-hypertroph ; Cyanobacteria ; morphometry ; mixing ; euphotic depth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract There are different approaches for classifying deep andshallowwaters using physically and ecologically derived parameters.Nevertheless, transition states make it difficult to definebordercrossing points between the two types of limnetic ecosystemsand todistinguish more precisely between different types of shallow,especially highly eutrophicated lakes. We contribute adetailedanalysis of different characteristics of shallow waters fromlakesin the Berlin/Brandenburg-region. In the catchment area of theriver Dahme in Eastern Brandenburg (Scharmützelsee-region)wefind mainly shallow and highly eutrophicated lakes, dominatedbyCyanobacteria. ’Very shallow‘ lakes of different morphometry andtopography are compared with ’medium shallow‘ or deeper lakesinthe region with similar loading characteristics for thefollowingproperties: morphometry, topography, theoretical retentiontime,mixing intensity, nutrient dynamics, external and internalloading,underwater light climate, zeu/zmix,phytoplankton development and oxygen budget. We found that’veryshallow‘ lakes in the region are more efficient in convertingtheavailable phosphorus into phytoplankton biomass because of theconstant and sufficient underwater light climate due to thefavourable relation of zeu and zmix. Weconclude that the regular mixing regime guarantees a stableandnear optimum light/dark rhythm as well as higher heterotrophicactivities, stimulating primary production up to the upperlimit ofalgal development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017012012099
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Phytoplankton of the extremely acidic mining lakes of Lusatia (Germany) with pH ≤3 (2000)
    Springer
    Hydrobiologia 433 (2000), S. 123-128 
    Details
    ISSN: 1573-5117
    Keywords: phytoplankton ; acidic mining lakes ; autecology ; nanoflagellates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Most of the flooded, open-cast lignite mining lakes of Lusatia (Germany) impacted by the oxidation of iron sulphides (pyrite and marcasite) are extremely acidic. Of 32 lakes regularly studied from 1995 to 1998, 14 have a pH 〈3 (median pH 2.3–2.9). These lakes are typically buffered by high concentrations of Fe (III) and have high conductivity (1000–5000 μS cm−1). Concentrations of dissolved inorganic carbon (DIC) and phosphorus are typically extremely low. These factors result in a very different environment for algae than found in neutral and acid-rain impacted lakes. The planktonic algal flora is generally dominated by flagellates belonging to genera of Chlorophyta (Chlamydomonas), Heterokontophyta of the class Chrysophyceae (Ochromonas, Chromulina), Cryptophyta (Cyathomonas) and Euglenophyta (Lepocinclis, Euglena mutabilis). Near-spherical non-motile Chlorophyta (Nanochlorum sp.), Heterokontophyta of the class Bacillariophyceae (Eunotia exigua, Nitzschia), Dinophyta (Gymnodinium, Peridinium umbonatum), other Chlorophyta (Scourfieldia cordiformis) and Cryptophyta (Rhodomonas minuta) are also found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004018722898
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On the occurrence of clear-water phases in relation to shallowness and trophic state: a comparative study (1999)
    Springer
    Hydrobiologia 408-409 (1999), S. 251-262 
    Details
    ISSN: 1573-5117
    Keywords: clear-water phase ; cyanobacteria ; Cladocera ; shallow lakes ; seasonal succession ; PEG model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present a comparative study on the occurrence of spring clear-water phases in six eutrophic lakes (two deep, four very shallow lakes dominated by plankton, TP: 0.06–0.13 mg l-1) in the Scharmützelsee region (Germany). Our aim was to analyse the occurrence and intensity of clear-water phases in relation to shallowness and trophic state. We defined a clear-water phase by a continuous increase of Secchi depth, a corresponding decrease in algal biomass and a shift in phytoplankton species composition during the growth phase of cladoceran zooplankton. For shallow lakes, we used the increase of the euphotic depth up to maximum depth as an additional criterion. Only in two of six lakes a clear-water phase occurred. In two lakes, no spring peak of cladocerans developed. In two other lakes, a high biomass of grazing resistant cyanobacteria was not affected by cladoceran maxima. Daphnia galeatawas an important component of the grazer community in lakes with a clear-water phase, whereas lakes without a clear-water phase were dominated by Bosmina longirostris. Top-down control of grazing by fish predation is discussed as the main factor determining biomass, composition and timing of the cladoceran spring peak. The assumed relative strength of fish predation between lakes corresponds to the response in algal biomass, dominance of cyanobacteria and is inversely related to the potential grazing pressure (ratio of cladoceran and algal biomass). Bottom-up effects (food quality) and additional factors (fungal infection, flushing rate) may also influence growth and timing of cladocerans. Our results support the view that a high biomass of grazing zooplankton is essential for the occurrence of a clear-water phase, but not sufficient to explain variability between lakes. High cladoceran maxima in hypertrophic lakes indicate that food quality seems not to limit grazer biomass. Decoupling of zooplankton and phytoplankton may be the result of early and fast growth of grazing resistant algae. We conclude that shallowness and trophy may indirectly reduce the extent and predictibility of a clear-water phase by enhanced growth of cyanobacteria and increasing predation pressure at least for lakes on this TP level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017088008761
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    Paper (German National Licenses)
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