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  • 1
    Online Resource
    Online Resource
    Hydrographic, chemical and planktological data from the north-west African upwelling area obtained from February to April 1983 : ("Ostatlantik-Biozirkel") (2017)
    Kiel : Inst. für Meereskunde
    Details Availability
    Type of Medium: Online Resource
    Pages: Online-Ressource (108 Seiten, 1,7 MB) , Diagramme
    Series Statement: Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel 140
    URL: https://oceanrep.geomar.de/32091/
    URL: http://dx.doi.org/10.3289/ifm_ber_140
    DOI: 10.3289/ifm_ber_140
    Language: English
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 2
    Electronic Resource
    Electronic Resource
    Population dynamic studies on phytoplankton cultures (1976)
    Springer
    Marine biology 35 (1976), S. 201-209 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Prorocentrum micans Ehrenberg and Gymnodinium splendens Lebour were cultivated in a halfsynthetic medium at 18°C. The generation time was 43.6≦46.8≦50.5 h for P. micans and 49.0≦53.7≦59.3 h for G. splendens. Variation of nutrient concentrations did not influence the generation time, but caused changes in the production rate of new cells. In the stationary phase, P. micans populations grew by 735±50 cells/ml in filtered sea water without addition of nutrients and by 5437±1214 cells/ml with the addition of 500 μg-at NO3-N/l and 30 μg-at PO4-P/l. In bi-algal cultures, P. micans shows changes in generation time and in cell production, whereas with G. splendens changes occur only in cell production. The degree of change depends on the ratio of the two algae as defined at the start of the experiments (see Table 3). P. micans did not grow in the filtered medium previously used to cultivate G. splendens, whereas G. splendens did grow in the filtrate of P. micans cultures. Presumably G. splendens excretes an inhibiting factor affecting the growth of P. micans, whereas the effect on G. splendens production exerted by P. micans seems to be due to nutrient competition. The relevance of the results obtained from in vitro experiments on the interpretation of in situ population dynamics is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396868
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  • 3
    Electronic Resource
    Electronic Resource
    On population dynamics in multi-species cultures of diatoms and dinoflagellates (1977)
    Springer
    Helgoland marine research 30 (1977), S. 192-200 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In order to assess the phenomena possibly underlying population dynamics and species succession in the sea, the following phytoplankton culture experiments were made. In uni-algal and in multi-algal batch cultures, generation times and cell yields gained during logarithmic growth were determined for the diatomsBiddulphia regia andCoscinodiscus concinnus, as well as for the dinoflagellates,Ceratium horridum andProrocentrum micans. In multi-species cultures, none of the tested organisms showed any influence on generation time, compared with uni-algal cultures. In contrast, the cell yield of different species showed considerable changes depending on the species concerned and the species-combination used. The dinoflagellatesC. horridum reached, if cultivated together withB. regia orB. regia andC. concinnus, only 10% of the cell number of uni-algal cultures. In the combinations tested,B. regia produced always more than half of the cell number attained in uni-algal cultures. In multi-species cultures,C. concinnus cell production was not affected. Addition of nitrate and phosphate to stationary-phase multi-species cultures induced further growth. Thus it is concluded that growth is limited by nutrient competition in the multi-species experiments conducted. Possible mechanisms of nutrient competition are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02207835
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  • 4
    Electronic Resource
    Electronic Resource
    Cadmium and zinc uptake, growth, and primary production inCoscinodiscus granii cultures containing low levels of cells and dissolved organic carbon (1980)
    Springer
    Helgoland marine research 33 (1980), S. 79-88 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Coscinodiscus granii Gough was cultivated at low cell densities in aged Atlantic sea water containing very little dissolved organic carbon; the water was enriched with low levels of nutrients but no chelators were added. Cadmium additions provided final concentrations of 0.1 to 26.5 µg Cd l−1, zinc being kept constant at a level of 38 µg Zn l−1. Carrier-free109Cd and65Zn were used as tracers for the two metals. Growth in terms of cell numbers and primary productivity capacity, using the14C uptake rate, was followed during the exponential growth phase for the first 5 days of the experiment and then for a further 3 days during the stationary phase. On each day, the metal contents of the cells were determined. Cadmium concentrations of 20 µg Cd l−1 and more resulted in growth inhibition whereas 17.5 µg Cd l−1 reduced the growth only slightly. The physiological state of the cells influenced the heavy-metal uptake per cell at sublethal Cd levels. Dead cells had a higher heavy-metal concentration than living cells. Microscopical observations revealed that cells just about to divide were less sensitive to a given toxic heavy-metal concentration than cells which had recently divided. This might have been due to different surface/volume ratios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02414737
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  • 5
    Electronic Resource
    Electronic Resource
    Life cycles, phylogeny and taxonomy ofDissodinium andPyrocystis (Dinophyta) (1978)
    Springer
    Helgoland marine research 31 (1978), S. 347-366 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Life cycles of several species belonging to the marine generaDissodinium Klebs in Pascher andPyrocystis Murray ex Haeckel are described. The two known species ofDissodinium, D. pseudolunula Swift ex Elbr. & Dreb., (=D. lunula auct. nonnull.) andD. pseudocalani (Gönnert) Drebes ex Elb. & Dreb. are ectoparasites of copepod eggs. In this genus, sporogenesis, with obligate sequence from primary cyst to secondary cyst to dinospores, occurs by palintomy.Dissodinium is placed into the order Blastodiniales Schiller and its position in this order is discussed. The asexual life cycle ofPyrocystis spp. represents an alternation between a dominating coccoid stage and a morphologically different transitory reproductive stage. The reproductive bodies may be either athecate aplanospores, athecate uni- or biflagellate planospores or thecate biflagellate planospores. Thecal morphology of thecate planospores resembles those ofGonyaulax Diesing. The occurrence of both, athecate aplanospores and thecate planospores in the same species, is discussed.Pyrocystis is regarded as belonging to the order Pyrocystales Apstein. The possible derivation from the Gonyaulacaceae Lindemann is suggested. In addition, the generaDissodinium andPyrocystis are redefined. A description ofD. pseudolunula as well as a list of synonyms and references for detailed descriptions ofP. lunula (Schütt) Schütt, not includingD. pseudolunula, is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02189487
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  • 6
    Electronic Resource
    Electronic Resource
    Redescription ofGymnodinium heterostriatum Kofoid et Swezy 1921 (Dinophyceae) (1994)
    Springer
    Helgoland marine research 48 (1994), S. 359-363 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The dinoflagellateGymnodinium heterostriatum Kofoid et Swezy is described anew from live material of the upwelling region off the NW African coast. The characteristics that distinguish it fromGymnodinium striatissimum Hulburt, a species with which it has been mistaken since the original description, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02366252
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  • 7
    Electronic Resource
    Electronic Resource
    Pirsonia guinardiae, gen. et spec. nov.: A parasitic flagellate on the marine diatomGuinardia flaccida with an unusual mode of food uptake (1990)
    Springer
    Helgoland marine research 44 (1990), S. 275-293 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Pirsonia guinardiae gen. et spec. nov. was discovered as a parasite onGuinardia flaccida in the North Sea near List/Sylt during a bloom of this centric planktonic diatom. It is a colourless, small flagellate with an oblique cell apex and two subapically inserting flagella of different length and different orientation. The flagellates attach to a host cell and form an antapical process which pierces the diatom frustule and develops inside into a “trophosome”, consisting of a proximal digestion vacuole and distal pseudopodia which phagocytise host cytoplasm. The main body, the “auxosome”, remains outside the host cell. The trophosome persists for some time after the detachment of the auxosome or its derivatives. There are two types ofPirsonia guinardiae. Type A attaches to the valvae as well as to the girdle region, the auxosome remains flagellated and generally detaches after the feeding process to divide twice (seldom 3 times). Thick-walled (resting?) cysts are formed. Occasionally, a fusion of two sister cells has been observed. Type B attaches only to the valvae; the auxosome lacks flagella; it divides during the feeding process to give rise to a bouquet of 8 to more than 50 daughter cells which become flagellated when they detach. The taxonomical position of the flagellate is discussed. Diagnoses of genus and species are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02365468
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  • 8
    Electronic Resource
    Electronic Resource
    Application of Laser Doppler Spectroscopy (LDS) in determining swimming velocities of motile phytoplankton (1986)
    Springer
    Marine biology 93 (1986), S. 323-327 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The swimming velocities of 18 motile phytoplankton species were measured by applying Laser Doppler Spectroscopy (LDS). The size of the organisms used in the experiments ranged from nanoplankton (〈20 μm) to large dinoflagellates (〉100 μm). Results of the measurements showed that the swimming rates of nanoflagellates and coccolithophorids are similar to those of dinoflagellates. Swimming rates obtained for dinoflagellates and coccolithophorids exceed the sinking rates reported in the literature. LDS offers several advantages when compared with other methods applied to measuring velocity: (1) it is very fast (1–3 min); (2) it is not invasive; (3) up to ten parallel samples can be measured automatically in sequence and repetitively; (4) in contrast to microscopic measurements, motility is measured in three dimensions; and (5) it is a direct and objective method which only requires small sample volume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401099
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  • 9
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    Hydrographic, chemical and planktological data from the north-west African upwelling area obtained from February to April 1983 : ("Ostatlantik-Biozirkel") (1985)
    Institut für Meereskunde
    In:  Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, 140 . Institut für Meereskunde, Kiel, Germany, 105 pp.
    Details
    Publication Date: 2016-04-18
    Type: Report , NonPeerReviewed
    Format: text
    DOI: 10.3289/ifm_ber_140
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    OceanRep: Report - other report
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