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  • 1
    Digitale Medien
    Digitale Medien
    Genetic variability in the cosmopolitan deep-water ophiuran Ophiomusium lymani (1974)
    Springer
    Marine biology 27 (1974), S. 51-57 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00394760
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  • 2
    Digitale Medien
    Digitale Medien
    High genetic variability in a population of Tridacna maxima from the Great Barrier Reef (1975)
    Springer
    Marine biology 33 (1975), S. 341-345 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A population of the bivalve mollusk Tridacna maxima (Röding) from Hron Island, Great Barrier Reef, Australia, was studied by gel electrophoresis, and proved to be highly variable genetically, with an average heterozygosity of about 22%. This compares closely with a population of T. maxima from Enewetak (Eniwetok) Atoll, with an average heterozygosity of about 20%, very high for marine organisms. Enewetak Atoll was the site of a series of nuclear tests. The Heron Island study verifies that the high variability is natural, and supports the hypothesis that species from trophically stable environments tend to be highly variable genetically.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00390572
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  • 3
    Digitale Medien
    Digitale Medien
    Extinction of taxa and Van Valen's law (1975)
    [s.l.] : Nature Publishing Group
    Nature 257 (1975), S. 514-515 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] VAN VALENI has proposed an evolutionary law that has attracted considerable attention2"6. He showed that plots of survivorship of taxa as a function of age are commonly log-linear (see Fig. 1 of ref. 1). This he interpreted to mean that the probability of extinction of a taxon is independent of its ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/257514b0
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  • 4
    Digitale Medien
    Digitale Medien
    Plate-tectonic Regulation of Faunal Diversity and Sea Level: a Model (1970)
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 657-659 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Among the factors that regulate species diversity are environmental stability2'3, food supply2'4'5 and provinciality6'7. Consider a large land mass composed of an assembly of all the presently dispersed continents. Such a continental state favours great seasonality of marine climate, partly as a ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/228657a0
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