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  • 1
    Book
    Book
    Intermediate disturbance hypothesis in phytoplankton ecology : proceedings of the 8th workshop of the International Association of Phytoplankton Taxonomy and Ecology held in Baja (Hungary), 5 - 15 July 1991 (1993)
    Dordrecht [u.a.] : Kluwer Academic Publishers
    Details Availability
    Keywords: Phytoplankton Congresses Ecology ; Phytoplankton ; Ökologie ; Konferenzschrift
    In: Hydrobiologia ; 249 (1993)
    Type of Medium: Book
    Pages: X, 199 S , Ill., graph. Darst , 27 cm
    ISBN: 0792320972
    Series Statement: Developments in hydrobiology 81
    URL: http://www.loc.gov/catdir/enhancements/fy0822/92041133-d.html
    URL: http://www.loc.gov/catdir/enhancements/fy0822/92041133-t.html
    URL: http://www.gbv.de/dms/bowker/toc/9780792320975.pdf
    DDC: 589.4
    Language: English
    Note: Literaturangaben
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  • 2
    Book
    Book
    Planktologie (1994)
    Berlin : Springer
    Details Availability
    Keywords: Lehrbuch ; Plankton
    Description / Table of Contents: Plankton ist die Summe der im Wasser (Meer- und Süßwasser) schwebenden Organismen pflanzlicher oder tierischer Herkunft. Da etwa 70 % der Erde mit Wasser bedeckt sind, bildet es die größte Lebensgemeinschaft der Erde. Hier ein Hochschullehrbuch vor allem über die allgemeinen Fragen (Physikalische und chemische Umwelt, Einfluß auf die Fischerei, Bedeutung für saubere Luft und Wasser, Geochemie, Populationen und ihre Vernetzungen, Grundformen der Planktonorganismen). Der Autor ist Professor am bekannten Kieler Institut für Meereskunde. Eine biologisch gut sortierte Bibliothek braucht das Buch. (3) (LK/KI: Bock)
    Type of Medium: Book
    Pages: XII, 274 S. , Ill., graph. Darst., Kt. , 24 cm
    ISBN: 9783540576761 , 3540576762
    URL: https://swbplus.bsz-bw.de/bsz041144422inh.htm
    DDC: 574.92
    RVK:
    WI 4750
    RVK:
    WI 4730
    RVK:
    WI 4440
    RVK:
    WI 4460
    RVK:
    AR 22200
    RVK:
    RZ 10525
    RVK:
    WI 4400
    RVK:
    WI 4470
    Language: German
    Note: Literaturverz. S. [259] - 265
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  • 3
    Electronic Resource
    Electronic Resource
    Convergent succession of phytoplankton in microcosms with different inoculum species composition (1991)
    Springer
    Oecologia 87 (1991), S. 171-179 
    Details
    ISSN: 1432-1939
    Keywords: Phytoplankton ; Zooplankton ; Microcosm Succession ; Competition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Different initial mixtures of phyto-and zooplankton from different lakes were grown under identical chemical and physical conditions in medium size (8-and 12–1) laboratory microcosm cultures until convergence of phytoplankton species composition was attained. Five such experiments with four (four experiments) or three (one experiment) microcosm cultures were run. Three experiments were performed with weak stirring which permitted sedimentary elimination of the diatoms. Two experiments were conducted with stronger stirring to prevent sedimentation. In the three “sedimentation intensive” experiments, the final phytoplankton community was composed of the filamentous chlorophyte Mougeotia thylespora together with a smaller biomass of nanoplanktic algae. In the two “sedimentation free” experiments the final phytoplankton community consisted of pennate diatoms. Both dissolved nutrient concentrations and the chemical composition of biomass suggested strong nutrient limitation of algal growth rates in the final phase of the experiments. The zooplankton communities at the end of the experiments were composed of species that were apparently unable to ingest the large, dominant algae and that presumably fed on the nanoplanktic “undergrowth” and the bacteria. There was a distinct sequence of events in all experiments: first, the large zooplankton species (Daphnia and Copepoda) were replaced by smaller ones (Chydorus, Bosmina, rotifers); second, all cultures within one experiment developed the same nutritional status (limitation by the same nutrient); and third, the taxonomic composition of phytoplankton of the different cultures within one experiment converged. The last took 7–9 weeks, with is about 2–3 times as long as the time needed in a phytoplankton competition experiment to reach the final outcome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325254
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  • 4
    Electronic Resource
    Electronic Resource
    The first decade of oligotrophication of Lake Constance (1993)
    Springer
    Oecologia 93 (1993), S. 276-284 
    Details
    ISSN: 1432-1939
    Keywords: Phytoplankton ; Recovery from eutrophication ; Species composition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In Lake Constance, after several decades of cutrophication, a decrease in phosphorus loading over the last decade has lead to a partial recovery from eutrophication. Here we analyse the shift in the taxonomic composition of phytoplankton during the first decade of oligotrophication in Lake Constance. During the 1980s, spring total P concentrations decreased from ca. 130 to less than 50 μ·l−1. This decrease was reflected by an approximately proportional decrease in summer phytoplankton biomass while spring phytoplankton biomass seemed unresponsive. Major taxonomic changes occured during both growth seasons. In spring, the proportion of diatoms, green algae and Chrysophyta increased while the proportion of Cryptophyta decreased. The summer trend was very different: the relative importance of diatoms decreased and Cryptophyta and Chrysophyta increased, while Chlorophyta reached their peak around 1985. These trends are also analysed at the genus level. Comparison with taxonomic trends during the eutrophication period shows the expected reversals in most cases. Comparison with other lakes shows general similarities, with the notable exception that Planktothrix rubescens has never been important in Lake Constance. The increase of diatoms during spring is attributed to their improved competitive performance with increasing Si:P ratios. Their decrease during summer is explained by the increasing silicate removal from the epilimnion by increasing spring populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317682
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  • 5
    Electronic Resource
    Electronic Resource
    Disturbance-diversity relationships in two lakes of similar nutrient chemistry but contrasting disturbance regimes (1993)
    Springer
    Hydrobiologia 249 (1993), S. 59-65 
    Details
    ISSN: 1573-5117
    Keywords: diversity ; disturbance ; phytoplankton ; carrying capacity ; competitive exclusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phytoplankton diversity was studied in two North German lakes of comparable nutrient chemistry but different exposure to winds. In both lakes, phytoplankton was primarily N-limited but diatoms were Si-limited. Plußsee had a very constant mixing depth during summer, while week-to-week changes of several meters were quite common in the more exposed Behler See. In Plußsee, phytoplankton biomass during summer came closer to the carrying capacity as defined by the available total N. In Plußsee there was a marked decline of diversity during the summer maximum of biomass, while this decline was less pronounced in Behler See. It is concluded that disturbances which prevented phytoplankton from reaching the carrying capacity also maintained a high level of diversity. A negative response of diversity to undisturbed conditions became apparent, after phytoplankton biomass had exceeded about 5% of the carrying capacity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008843
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  • 6
    Electronic Resource
    Electronic Resource
    Physical properties of β-N-acetyl-D-glucosaminidase and β-N-acetyl-D-hexosaminidase from Drosophila Kc-cells (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 18 (1991), S. 45-53 
    Details
    ISSN: 0739-4462
    Keywords: molecular mass ; pH and temperature optima ; thermal stability ; influence of ionic strength ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Kc-cells from Drosophila produce two different β-D-hexosaminidases, a β-N-acetyl-D-glucosaminidase (E.C.3.2.1.30) and a β-N-acetyl-D-hexosaminidase (E.C.3.2.1.52), which are also secreted into the medium. The Mr of both enzymes is about 126,000 ± 9,700; the S-values are 8.37 ± 0.44. Both enzymes have about the same pH optima at 5.5 and the same thermal stability. The temperature optima are identical (50°C) for both enzymes if p-nitrophenyl-N-acetylglucosaminide is used as a substrate. However, when p-nitrophenyl-N-acetylgalactoseaminide is used as the substrate the β-N-acetyl-D-hexosaminidase has a temperature optimum about 10°C higher. With higher salt concentrations, the activity of the β-N-acetyl-D-glucosaminidase increases, whereas β-N-acetyl-D-hexosaminidase is inhibited. Both enzymes also differ in their sensitivity to urea, the β-N-acetyl-D-hexosaminidase being less sensitive than the β-N-acetyl-D-glucosaminidase.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/arch.940180105
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  • 7
    Electronic Resource
    Electronic Resource
    Demonstration of β-N-acetyl-D-glucosaminidase and β-N-acetyl-D-hexosaminidase in Drosophila Kc-cells (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 17 (1991), S. 3-13 
    Details
    ISSN: 0739-4462
    Keywords: intra- and extracellular enzymes ; kinetic properties ; inhibition ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Kc-cells from Drosophila melanogaster, grown under serum-free conditions, produce two β-hexosaminidases and secrete these enzymes into the medium. The two enzymes were separated by DEAE-exchange chromatography. According to their substrate specificities one enzyme is a β-N-acetyl-D-glucosaminidase (E.C.3.2.1.30), the other one a β-N-acetyl-D-hexosaminidase (E.C.3.2.1.52). The β-N-acetyl-D-glucosaminidase is predominant in the medium, the β-N-acetyl-D-hexosaminidase within the cells. The Km values for the substrates pNP-GlcNAc, pNP-GalNAc, and (GlcNAc)2 are 0.8, 16.73, and 1.67 mM for the β-N-acetyl-D-glucosaminidase and 0.24, 0.44, and 0.2 mM for the β-N-acetyl-D-hexosaminidase. Both enzymes are inhibited by the products and the β-N-acetyl-D-glucosaminidase is also inhibited stereospecifically by the substrates pNP-GlcNAc and (GlcNAc)2. Both enzymes are inhibited in a partial competitive way by acetamidolactones, the Kis being as low as 0.1 μM.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/arch.940170103
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  • 8
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    The impact of light intensity and daylength on silicate and nitrate competition among marine phytoplankton (1994)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 39 (7). pp. 1680-1688.
    Details
    Publication Date: 2018-06-25
    Description: I tested the extent to which differences in light supply could influence the outcome of nutrient (Si and N) competition between marine phytoplankton. Competition experiments were performed with 11 species of marine phytoplankton at Si: N ratios from 16 to 124 : 1, light intensities from 28 to 225 µmol quanta m−2 s−1, and three different daylengths. Thus, light supply was the composite result of two components: photoperiod and intensity. Diatoms were dominant competitors at higher Si: N ratios, nonsiliceous flagellates at lower ones. Light had no impact on the transition from flagellate to diatom dominance along the Si: N gradient. However, species within those groups were separated along the light gradient. Contrary to theoretical expectations, changes in light intensity and changes in daylength led to similar shifts in species dominance. Therefore, it was possible to describe the light climate by the integral parameter “daily light dose.”
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.4319/lo.1994.39.7.1680
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  • 9
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    Phytoplankton competition in Plußsee: a field test of the resource-ratio hypothesis (1993)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 38 (4). pp. 838-845.
    Details
    Publication Date: 2018-06-25
    Description: During a 10-month study in Plusssee Si, N, and light were found as potentially limiting resources for phytoplankton growth rates. Therefore, three ratios of essential resources (Si : N, Si : light, N : light) and one ratio of substitutable resources (nitrate: ammonium) were compared to changes in species composition to test the hypothesis that the seasonal change of phytoplankton species composition was a response to changing resource ratios. The relationship was analyzed by a rank correlation analysis between the relative contribution of individual species to total biomass and resource ratios. Allowance was made for time lags between changes in resource ratios and changes in relative biomass. Of 16 species, 14 showed a significant response to at least one resource ratio. Time lags ranged from 0 to 6 weeks. Most species seemed to be favored either by minimal or maximal ratios; optimal ratios in the middle of the range were rare.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.4319/lo.1993.38.4.0838
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  • 10
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    A Comparison of the Droop and the Monod Models of Nutrient Limited Growth Applied to Natural Populations of Phytoplankton (1991)
    British Ecological Society
    In:  Functional Ecology, 5 (4). p. 535.
    Details
    Publication Date: 2017-01-16
    Description: The extent of nutrient limitation of phytoplankton in eutrophic Pluβsee was studied by enrichment bioassays and by analysing the cellular stoichiometry of monospecific fractions obtained by size fractionation and density-gradient separation. In this lake silicate and nitrogen, but not phosphorus, at times limit the reproductive rates of phytoplankton. The dependence of nutrient-limited reproductive rates on the cellular content of the limiting nutrient (cell quota) could well be described by the Droop model. Biomass specific minimal cell quotas of nitrogen ranged from 0.014 to 0.061 mol N mol-1 C, minimal cell quotas of silicon ranged from 0.055 to 0.127 mol Si mol-1 C. The cell quotas of the non-limiting nutrients usually increased with the cell quotas of the limiting nutrient. In contrast to the Droop model, the Monod model which relies on ambient concentrations of limiting nutrients was a much poorer predictor of growth rates.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.2307/2389636
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