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  • 1985-1989  (3)
  • 1980-1984
  • monophagy  (2)
  • predation  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Host specificity in phytophagous insects: selection pressure from generalist predators (1988)
    Springer
    Entomologia experimentalis et applicata 49 (1988), S. 131-140 
    Details
    ISSN: 1570-7458
    Keywords: evolution ; monophagy ; polyphagy ; host range ; Vespidae ; caterpillars ; predation ; Mischocyttarus flavitarsus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The narrow host range of insect herbivores is noted, and some of the reasons why specificity has evolved are reviewed. Works indicating the need for new approaches are pointed out including the possibility that generalist predators provide a suitable pressure. Experiments to test the hypothesis that generalists are more vulnerable than specialists to predators are described. They involved a vespid wasp and over thirty species pairs of caterpillars, matched for size and density. Overall, generalists were taken more readily than specialists: some but not all reasons could be detected. The results are discussed in ecological and evolutionary terms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188246
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Host range in phytophagous insects: the potential role of generalist predators (1989)
    Springer
    Evolutionary ecology 3 (1989), S. 299-311 
    Details
    ISSN: 1573-8477
    Keywords: Host range ; evolution ; herbivores ; predation ; selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The potential role of generalist natural enemies is presented as one of the important ecological pressures that select for narrow host range in phytophagous insects, and dominant relative to physiological bases for specialization. Experiments are described in three completely different systems indicating that generalist herbivores are more vulnerable to predation than specialist herbivores. The three predators were (a) the vespid waspMischocyttarus flavitarsus, (b) the Argentine antIridomyrmex humilis and (c) the coccinellid beetleHippodamia convergens. It is concluded the predators may provide strong selection pressure for maintenance and perhaps evolution of narrow host range in insect herbivores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02285261
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Chemical aspects of host-plant specificity in threeLarrea-feeding grasshoppers (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 561-579 
    Details
    ISSN: 1573-1561
    Keywords: Creosote bush ; Larrea ; nordihydroguaiaretic acid ; grasshoppers ; monophagy ; Bootettix ; Ligurotettix ; Cibolacris ; Orthoptera ; Acrididae ; host selection ; feeding deterrence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The host-selection behavior of three species of grasshopper feeding on creosote bush,Larrea tridentata, in southern California was investigated. The species wereBootettix argentatus, which is monophagous;Ligurotettix coquilletti, oligophagous; andCibolacris parviceps, polyphagous. The monophagous species is stimulated to bite by nordihydroguaiaretic acid (NDGA), a compound that is characteristic of the host plant and that may comprise up to 10% of the dry weight of the leaf. Host specificity ofB. argentatus is enhanced by deterrent responses to compounds present in the surface waxes of all non-host-plant species. Both the oligophagous and polyphagous species are deterred by NDGA at naturally occurring concentrations. Their association withLarrea is probably based on tolerance of the plant chemicals rather than on dependence on specific chemicals. Factors other than the chemistry of the plant probably also contribute to the specificity ofB. argentatus andL. coquilletti.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01013907
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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