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  • Articles: DFG German National Licenses  (5)
  • 1970-1974  (5)
Source
  • Articles: DFG German National Licenses  (5)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Genetic variability in the cosmopolitan deep-water ophiuran Ophiomusium lymani (1974)
    Springer
    Marine biology 27 (1974), S. 51-57 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A population of the cosmopolitan deep-sea ophiuran Ophiomusium lymani was studied by gel electrophoresis, and proved to be highly variable genetically; about 53% of the 15 loci studied are polymorphic, and the average individual is heterozygous at about 17% of the loci. This is approximately the same genetic variability displayed by other species, belonging to other phyla or classes, from the same deep-sea trawl. A similarly high level of genetic variation occurs in deep-sea organisms in general, and in a shallow-water tropical species. Both the deep-sea and the tropics are trophically stable environments. On the other hand, low genetic variabilities have been found in marine species from trophically unstable environments. These data suggest that any phylogenetic effects on genetic variability are secondary, and that the trophic regime may be of major importance in determining genetic strategies of adaptation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394760
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Frequency-Dependent Selection (1974)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 5 (1974), S. 115-138 
    Details
    ISSN: 0066-4162
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.es.05.110174.000555
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Invalidation of Principle of Competitive Exclusion Defended (1970)
    [s.l.] : Nature Publishing Group
    Nature 227 (1970), S. 89-90 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the competition between species of Paramecium, P. aurelia lived predominantly in the upper layer of the liquid medium and fed mostly on bacteria, while P. bursaria lived preferentially in the bottom layer and fed on yeast. There was therefore only a slight mutual depression between the species. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/227089b0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Competition between strains ofDrosophila willistoni andD. pseudoobscura (1971)
    Springer
    Cellular and molecular life sciences 27 (1971), S. 343-343 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen El resultado de la competencia entreDrosophila willistoni yD. pseudoobscura depende de la constitución genética de las estirpes que compiten y de la temperatura. A 20 °C las dos especies coexisten, lo cual indica que el principio de exclusión competitiva no es universalmente válido.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02138187
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Adaptation by natural selection in populations ofDrosophila pseudoobscura (1970)
    Springer
    Cellular and molecular life sciences 26 (1970), S. 208-208 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen Seis poblaciones deDrosophila pseudoobscura han evolucionado, debido a la selección natural, hacia una mayor adaptación al ambiente. Durante 20 o 25 generaciones el número de individuos nacidos por unidad de comida y el tamano de la poblacion han aumentado gradualmente entre un dos y un cuatro por ciento por generaciön.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01895587
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    Paper (German National Licenses)
    Fulltext
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