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  • Grazing  (2)
  • Host selectivity  (2)
  • Apolipoprotein  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Isolation and partial characterization of lipoprotein A-II (LP-A-II) particles of human plasma
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 1126 (1992), S. 105-113 
    Details
    ISSN: 0005-2760
    Keywords: (Human plasma) ; Apolipoprotein ; Immunoaffinity chromatography ; Lipid ; Lipoprotein ; Lipoprotein A-II
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0005-2760(92)90223-I
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Keywords: Competition ; Hemiparasitism ; Host selectivity ; Rhinanthus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317393
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  • 3
    Electronic Resource
    Electronic Resource
    The host range and selectivity of a parasitic plant: Rhinanthus minor L. (1989)
    Springer
    Oecologia 78 (1989), S. 401-406 
    Details
    ISSN: 1432-1939
    Keywords: Rhinanthus ; Hemiparasitism ; Host selectivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379116
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  • 4
    Electronic Resource
    Electronic Resource
    The effects of sheep grazing on seedling establishment and survival in grassland (1988)
    Springer
    Plant ecology 78 (1988), S. 91-98 
    Details
    ISSN: 1573-5052
    Keywords: Gap size ; Grazing ; Insect herbivory ; Seedling ; Sheep
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper examines the effects of sheep and insect grazing on the generation of natural gaps in turf and the establishment of seedlings therein. The site is on an old field on limestone. There were five sheep grazing treatments: ungrazed, and grazed briefly in spring, briefly in autumn, in autumn or in summer and autumn. The first three of these treatments also contained plots in which insecticide was applied regularly during the growing season. Pins of increasing size (1.6 mm–12.8 mm diameter) were lowered at grid intersections in permanent quadrats to record gap type and the occurrence of seedlings on seven dates over 15 months. Heavily-grazed plots had more bare ground in spring and more herb seedlings established in them. Seedlings of annual species of Bromus were able to establish in gaps (bare ground and litter) of smaller size than was required by herb seedlings (which had much smaller seeds). The use of an insecticide increased seedling establishment in October in ungrazed and in spring-grazed paddocks but decreased it in autumn-grazed paddocks. This may indicate the greater importance of insect herbivory in making gaps in the matted sward of autumn-grazed plots. Seedlings which established in October 1986 and March 1987 were more likely to die than those establishing earlier in 1986. This may be because of winter-kill and especially vigorous spring vegetation growth respectively. Seedling mortality was not affected by gap size or grazing treatment (unless such effects operated before we detected the seedlings).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00045643
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  • 5
    Electronic Resource
    Electronic Resource
    Spring grazing by sheep: effects on seasonal changes during early old field succession (1987)
    Springer
    Plant ecology 70 (1987), S. 33-43 
    Details
    ISSN: 1573-5052
    Keywords: Early secondary succession ; Grazing ; Restoration ; Sheep
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper describes early secondary succession on an old field on limestone released from cultivation four years previously. Seasonal changes in plant composition after spring grazing by sheep are compared with those in ungrazed controls. Grazed and ungrazed paddocks were laid out in Latin squares. Plants were sampled before and several times after grazing in April, at several spatial scales. Major changes in plant abundance and sward characters such as height and density persisted throughout the growing season. Annual herbs increased after grazing, but annual grasses declined, as did short-lived perennial herbs. Effects on perennial herbs were weak; perennial grasses usually increased but this depended on the species. This pattern confirms that sheep grazing affects the direction, as well as the rate of succession. Some effects, such as increases in biennial herbs and in species richness, were only evident at large scales of sampling, suggesting that they arose from changes in rare and widely dispersed species. Other species were affected at different spatial scales, and no one sampling method detected the full range of effects. These results indicate the potential power of manipulating grazing early in secondary succession for directing the course of community change, for conservation or other purposes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040756
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