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  • Other Sources  (7)
  • Articles (OceanRep)  (7)
  • ASLO (Association for the Sciences of Limnology and Oceanography)  (7)
  • American Meteorological Society
  • Springer Nature
  • 1985-1989  (7)
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  • Other Sources  (7)
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  • Articles (OceanRep)  (7)
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Year
  • 1
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    Phytoplankton natural community experiments: A reinterpretation (1985)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 30 . pp. 436-440.
    Details
    Publication Date: 2018-05-29
    Type: Article , PeerReviewed
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  • 2
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    Maximal growth rates of Antarctic phytoplankton: Only weak dependence on cell size (1989)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 34 (6). pp. 1109-1112.
    Details
    Publication Date: 2018-06-25
    Description: Maximal growth rates of 15 Antarctic phytoplankton species at 0 degree C ranged from 0.32 to 0.72/d, showing only a weak dependence on cell size. Comparisons were made with two models for size dependence of temperature-corrected rates of maximal growth. Schlesinger's general phytoplankton model predicts a strong size dependence of growth rates and grossly underestimates the maximal growth rates of the larger species, but gives reasonable estimates for the smallest ones. Banse's marine diatom model assumes a weak size dependence of growth rates and gives generally better predictions.
    Type: Article , PeerReviewed
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  • 3
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    Long range vertical migration of Volvox in tropical Lake Cahora Bassa (Mozambique) (1986)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 31 . pp. 650-653.
    Details
    Publication Date: 2018-06-25
    Type: Article , PeerReviewed
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  • 4
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    Analyses of the in-situ growth rates of Cryptophyceae by use of the mitotic index technique (1985)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 30 . pp. 893-897.
    Details
    Publication Date: 2018-06-06
    Description: Growth rates of Rhodomonas minuta v. nannoplanctica and Cryptomonas ovata were estimated by determining the fraction of cells undergoing cell division during 24 h. Acetocarmine was very useful for identifying stages of division (especially double nuclei). Division stages of R. minuta were found in Lake Constance during the night over a period of 16 or 17 h, of C. ovata over almost the entire 24-h cycle. A comparison of potential growth rates with observed changes in population density indicates that the higher temporal variability of loss rates is more influential for changes in population size
    Type: Article , PeerReviewed
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  • 5
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    Comparison between steady state and non-steady state competition: experiments with natural phytoplankton (1985)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 30 . pp. 335-346.
    Details
    Publication Date: 2018-06-06
    Description: Chemostat competition experiments with natural phytoplankton communities are compared to experiments in which either one (phosphorus) or two (phosphorus and silicon) key nutrients were added discontinuously at l-week intervals. In all types of experiments wide ranges of Si:P ratios were tested. Deviation from steady state was found not only to increase the number of coexisting species, but also to shift the regions of dominance of species and of higher taxa along the gradient of Si:P ratios. Pulsed nutrient addition was mainly to the advantage of green algae and to the disadvantage of diatoms.
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  • 6
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    Nutrient status and nutrient competition of phytoplankton in a shallow, hypertrophic lake (1989)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 34 (7). pp. 1162-1173.
    Details
    Publication Date: 2018-06-25
    Description: The nutritional status of phytoplankton in a shallow, hypertrophic lake was analyzed by stoichiometry of seston and by enrichment bioassays during a 6-month period. Both methods suggested moderate and temporally interrupted nutrient limitation of reproductive rates. Nitrogen was the most frequently limiting nutrient, phosphorus was next, and silicate limitation of three diatom species occurred only once. The nutritional status of the most abundant individual species could be described by the Monod equation. The nutritional status of the entire phytoplankton assemblage could be described by a modified version of the Droop equation. In accordance with competition theory, phytoplankton species were arrayed along resource ratio gradients. These results are consistent with ecophysiological models derived from culture experiments.
    Type: Article , PeerReviewed
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  • 7
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    Phytoplankton succession in microcosm experiments under simultaneous grazing pressure and resource limitation (1988)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 33 (5). pp. 1037-1054.
    Details
    Publication Date: 2018-06-25
    Description: The influence of grazing pressure on the occurrence and outcome of nutrient competition among planktonic algae was studied in two-chamber microcosms where there was a flow in both directions between a light reactor without out zooplankton and a dark reactor with zooplankton (Daphnia longispina and Daphnia magna). The phytoplankton inoculum was a mixed, natural assemblage. Zooplankton could influence the dynamics of phytoplankton both by selective grazing and by differential excretion of limiting nutrients. Grazing pressure did not prevent the occurrence of nutrient limitation in algae and, hence, of nutrient competition between them. Zooplankton did, however, influence the outcome of competition by lowering Si:P ratios. A comparison with my previous experiments shows that diatoms need higher Si:P supply ratios for dominance over green algae in the presence of grazers than in grazing-free competition with steady or weekly pulsed nutrient supply
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