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  • 1985-1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Palatability of British trees to insects: constitutive and induced defences (1986)
    Springer
    Oecologia 69 (1986), S. 316-319 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Undamaged foliage of sixteen species of broadleaved trees was assessed for background (constitutive) palatability using larvae of Spodoptera littoralis (Lepidoptera) in laboratory bioassays. Palatability (dry weight consumed in 48 h) varied significantly between species and exhibited a four-fold range. Leaves of fifteen species were damaged artificially in the field and offered with control (undamaged) leaves to Spodoptera after 48 h and two weeks on the tree. Leaves adjacent to the damaged ones were similarly tested. Ten species exhibited significant (P〈0.02) wound induced declines in palatability; damaged and adjacent foliage was involved. Although there was no significant relationship between the trees' constitutive palatability and the number of invertebrate herbivore species they support, this previously-demonstrated relationship closely approached significance when the species showing wound-induced effects were excluded from the regression. These results are discussed within the limitations of laboratory bioassays and the possible field consequences are briefly considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377640
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Temporal and spatial variation in palatability of soybean and cotton leaves following wounding (1989)
    Springer
    Oecologia 79 (1989), S. 520-525 
    Details
    ISSN: 1432-1939
    Keywords: Wound-induced changes ; Soybean ; Cotton ; Spodoptera littoralis ; Image analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Leaves of soybean (Glycine max (L.) Merr.) and cotton (Gossypium hirsutum L.) were mechanically damaged with a single hole and offered to Spodoptera littoralis Boisd (Lep., Noctuidae) larvae in laboratory bioassays at intervals of between 0 and 7 days from damage. The subsequent within-leaf grazing patterns of damaged and undamaged areas were compared using an image-analysing computer, and estimations were made by eye of percentage, areas grazed at three spatial scales. Reduction in palatability of damaged areas of both plant species was detected, at time intervals ranging from 0 to 7 days after damage. This effect was strongest for the longer time intervals and the effect became weaker with increasing distance from the site of damage. These results are discussed in relation to possible defensive roles of wound-induced changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378670
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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