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  • 1
    Electronic Resource
    Electronic Resource
    Persistent diel rhythms in the chlorophyll fluorescence of marine phytoplankton species (1982)
    Springer
    Marine biology 69 (1982), S. 253-262 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The diel periodicities of in-vivo chlorophyll fluorescence and DCMU-enhanced chlorophyll fluorescence of 47 marine phytoplankton species were examined for 2 d in a 14 h L:10 h D light: dark cycle and then in continous light for another 2 to 3 d. Almost all phytoplankton species exhibit a more rapid increase in in-vivo fluorescence and DCMU-enhanced fluorescence during the light phase than during the dark phase. About one-half of the species examined exhibited persistent diel rhythms in continous light, indicating the operation of a biological clock. No phylogenetic or habitat related trends as to which species exhibited persistent rhythms were apparent. Of the phyla of eukaryotic phytoplankton adequately examined, none lacked biological clocks. Contrary to past hypotheses, some phytoplankton species maintain a persistent diel rhythm in a constant environment while reproducing at a rate greater than one division per day.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397491
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Genetic variability and differentiation in the temperature niche component of the diatom Thalassiosira pseudonana (1981)
    Springer
    Marine biology 62 (1981), S. 103-110 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The acclimated reproduction rates of 14 clones of the diatom Thalassiosira pseudonana were measured at 12°, 16°, 20°, and 24°C. Reproduction rate increased monotonically with an increase in temperature in all 14 clones. Significant genetic variability in reproduction rates and electrophoretic mobility of isozymes were observed among clones within a population from a single water bottle collected in a warm core eddy overlying slope water. The major genetic differentiation was between neritic and oceanic populations, with neritic clones having higher reproduction rates at all 4 temperatures. Surprisingly small genetic differences were observed among clones from neritic waters around the world. The slopes of the temperature-reproduction rate plots of all 14 clones were quite similar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388171
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Coccoliths in Pleistocene–Holocene nannofossil assemblages (1980)
    [s.l.] : Nature Publishing Group
    Nature 285 (1980), S. 222-223 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Coccolithophores possess certain unique advantages for oxygen isotope palaeoclimatic studies. As phytoplankters, they are restricted to the photic zone, with maximum population densities found between 50 and 100m depth in most oceanic areas7. Consequently, coccolith secretion takes place only at ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/285222a0
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    Paper (German National Licenses)
    Fulltext
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