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  • 70B10  (2)
  • Host selectivity  (2)
  • Springer  (4)
  • Oxford University Press
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  • Springer  (4)
  • Oxford University Press
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  • 1
    Digitale Medien
    Digitale Medien
    Host selectivity and the mediation of competition by the root hemiparasite Rhinanthus minor (1991)
    Springer
    Oecologia 86 (1991), S. 81-87 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Competition ; Hemiparasitism ; Host selectivity ; Rhinanthus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Rhinanthus minor (Yellow-rattle) was grown in replacement series mixtures with Lolium perenne and Trifolium repens. The hemiparasitic interaction resulted in Relative Yield Totals (the sum of the yields in mixture relative to those in monoculture) considerably above 2. The hemiparasite caused a greater decrease in the yield of the legume and also performed better on the legume, indicating that T. repens was a better host for R. minor than L. perenne under the experimental conditions. When L. perenne and T. repens were grown in binary mixture with or without R. minor the hemiparasite affected considerably the competitive relationship between the two species by selectively parasitizing the legume. The effect of R. minor on competition between the two species was, however, dependent upon the nutrient status of the soil: the higher the level of soil nitrogen the fewer haustorial connections were made with T. repens and the less was the depression in its yield. In another series of experiments in which Festuca rubra, Holcus lanatus and L. perenne were grown in various binary mixtures with or without R. minor it was also shown that the yield of a preferred host was depressed to the advantage of a non-preferred host. It is suggested that the mediation of competition by the hemiparasite provides a mechanism by which it might affect the structure and diversity of plant communities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00317393
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The host range and selectivity of a parasitic plant: Rhinanthus minor L. (1989)
    Springer
    Oecologia 78 (1989), S. 401-406 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Rhinanthus ; Hemiparasitism ; Host selectivity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Rhinanthus minor (Yellow-rattle) is a widespread hemiparasitic plant of grassland habitats throughout Britain. Association analysis of the dune vegetation at Holme-next-the-Sea in eastern England revealed only two potential host plants through positive association. In contrast direct examination of the root systems revealed haustorial connections with 20 host species. The number of species parasitized by one plant ranged from one to seven. Data from another four sites in Britain and one in central Europe indicate that the natural host range of R. minor encompasses at least 50 species from 18 families with 22% in the Leguminosae and 30% in the Gramineae. Comparison of the number of haustorial connections made to each species with the abundance of roots in the soil shows that R. minor is a highly selective parasite, but that the selectivity is not consistent between populations or between plants from different parts of the same population. The reasons for host selectivity are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00379116
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    First-order invariants of Euclidean motions (1991)
    Springer
    Acta applicandae mathematicae 24 (1991), S. 233-251 
    Details
    ISSN: 1572-9036
    Schlagwort(e): 70B10 ; Kinematics ; invariants ; screws
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract Let E(n) be the lie group of proper rigid motions of Euclidean n-space. The paper is concerned with the adjoint action of E(n) on its Lie algebra e(n), and the induced action on the Grassmannian of subspaces of e(n) of a given dimension. For the adjoint action, the authors list explicit generators for the ring of invariant polynomials. In the case n=3, of greatest physical interest, explicit finite invariant stratifications are given for the Grassmannians, providing a formal listing of the screw-systems familiar in theoretical kinematics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00047045
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    On the Hierarchy of screw systems (1993)
    Springer
    Acta applicandae mathematicae 32 (1993), S. 267-296 
    Details
    ISSN: 1572-9036
    Schlagwort(e): 70B10 ; Screw ; kinematics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract LetE(3) be the Lie group of proper rigid motions of Euclidean 3-space. The adjoint action ofE(3) on its Lie algebrae(3) induces an action on the Grassmannian of subspaces of given dimensiond. Projectively, these subspaces are the screw systems of classical kinematics. The authors show that existing classifications of screw systems give rise to Whitney regular stratifications of the Grassmannians, and establish diagrams of specialisations for the strata. A list is given of the screw systems which can appear generically for motions of 3-space with at most three degrees of freedom.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01082452
    Standort Signatur Erwartet Verfügbarkeit
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