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  • 1
    Digitale Medien
    Digitale Medien
    Induced Plant Responses to Herbivory (1989)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 20 (1989), S. 331-348 
    Details
    ISSN: 0066-4162
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.es.20.110189.001555
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Effects of clonal variation of the host plant, interspecific competition, and climate on the population size of a folivorous thrips (1987)
    Springer
    Oecologia 74 (1987), S. 298-303 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Climate ; Clonal variation ; Community structure ; Herbivory ; Interspecific competition ; Plant-insect interactions ; Thrips
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The effects of clonal variation, interspecific competition, and climate upon the population size of Apterothrips secticornis was assessed by a series of observations and experimental manipulations. Three clones of the host plant, Erigeron glaucus, consistently supported different numbers of thrips during monthly censuses. When rosettes of the three clones were transplanted to a common garden, relative numbers of thrips on the clones remained the same as those observed where the clones grew in situ. The presence or absence of other hervivores had no effect on thrips numbers in the common garden. Plume moth caterpillars and thrips were observed to co-occur less often than expected in the field but this was caused by differences in habitat selection by these two species rather than being the result of interspecific competition. Populations of thrips were affected by climate, but analyses suggest that the host clone was a more important factor.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00379373
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  • 3
    Digitale Medien
    Digitale Medien
    Communication between plants: induced resistance in wild tobacco plants following clipping of neighboring sagebrush (2000)
    Springer
    Oecologia 125 (2000), S. 66-71 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Key words Plant communication ; Herbivory ; Induced resistance ; Methyl jasmonate ; Plant-insect interactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  The possibility of communication between plants was proposed nearly 20 years ago, although previous demonstrations have suffered from methodological problems and have not been widely accepted. Here we report the first rigorous, experimental evidence demonstrating that undamaged plants respond to cues released by neighbors to induce higher levels of resistance against herbivores in nature. Sagebrush plants that were clipped in the field released a pulse of an epimer of methyl jasmonate that has been shown to be a volatile signal capable of inducing resistance in wild tobacco. Wild tobacco plants with clipped sagebrush neighbors had increased levels of the putative defensive oxidative enzyme, polyphenol oxidase, relative to control tobacco plants with unclipped sagebrush neighbors. Tobacco plants near clipped sagebrush experienced greatly reduced levels of leaf damage by grasshoppers and cutworms during three field seasons compared to unclipped controls. This result was not caused by an altered light regime experienced by tobacco near clipped neighbors. Barriers to soil contact between tobacco and sagebrush did not reduce the difference in leaf damage although barriers that blocked air contact negated the effect.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00008892
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  • 4
    Digitale Medien
    Digitale Medien
    Predator-mediated apparent competition between two herbivores that feed on grapevines (1994)
    Springer
    Oecologia 97 (1994), S. 508-511 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Apparent competition ; Spider mites ; Tetranychidae ; Predatory mites ; Vitis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract We have been releasing economically unimportant herbivorous mites of one species early in the season and protecting grapevines against another, more damaging herbivorous mite throughout the growing season. In this experiment, releases of economically unimportant Willamette mites alone, or of predatory mites alone, failed to reduce populations of the damaging Pacific spider mite. However, where both herbivorous Willamette mites and predatory mites were released together populations of Pacific mites were reduced. This interaction between effects of Willamette mites and predatory mites suggests that predation against Pacific mites was more effective where alternate prey (Willamette mites) were available for the predators. The “apparent competition” between Willamette mites and Pacific mites, mediated through their shared predator, can be an important force in the agroecosystem although its importance varies from year to year and vineyard to vineyard.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00325889
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  • 5
    Digitale Medien
    Digitale Medien
    Environmental conditions affecting the strength of induced resistance against mites in cotton (1987)
    Springer
    Oecologia 73 (1987), S. 414-419 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Induced resistance ; Cotton ; Spider mites ; Plant-herbivore interactions ; Population regulation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Spider mites (Tetranychus urticae) were raised on cotton plants that had been damaged by a previous bout of mite feeding (T. turkestani) and on control plants that were previously not exposed to mites. The effect of induced plant responses upon mite populations was variable ranging from a 4-fold reduction in population growth to no difference at all. The strength of induced resistance was greatest when the population growth of mites was low for other, unknown, reasons. When mite population growth on control plants was great, the effects of induced resistance were diminished. Mite population growth was inversely related to levels of initial damage caused by previous feeding. There was no evidence of a damage threshold that needed to be exceeded before induced resistance became effective. Increased levels of initial damage were not associated with morphological changes in the plants.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00385258
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