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  • 1
    Electronic Resource
    Electronic Resource
    Comparisons of deterrency and toxicity of selected secondary plant compounds to an oligophagous and a polyphagous acridid (1988)
    Springer
    Entomologia experimentalis et applicata 46 (1988), S. 241-247 
    Details
    ISSN: 1570-7458
    Keywords: Schistocerca ; Locusta ; deterrence ; toxicity ; plant secondary compounds ; grasshopper feeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La comparaison a porté sur les relations entre répulsion et toxicité de huit substances secondaires chez deux acridiens: Locusta migratoria, spécialiste de graminées, et Schistocerca gregaria, polyphage. L. migratoria est repoussé par toutes les substances proposées, aux concentrations naturelles, pour lesquelles S. gregaria a présenté des comportements trés divers. Mais surtout, L. migratoria a été significativement plus sensible que S. gregaria aux effets toxiques de ces substances quand elles sont injectées dans son haemolymphe; S. gregaria a réagi à ces substances plus par des modifications de son comportement. Il y a une corrélation significative pour les deux espèces, entre la répulsion et la toxicité des substances injectées.
    Notes: Abstract A comparison was made of the relationship between deterrence and toxicity of eight secondary compounds to two acridids. The grass specialist Locusta migratoria was compared with the polyphagous Schistocerca gregaria. L. migratoria was deterred by all compounds presented at natural concentrations to which S. gregaria showed a variety of behavioral responses. Overall, L. migratoria was significantly more susceptible to toxic effects of the chemicals when injected into the hemolymph than was S. gregaria and was more sensitive behaviourally to them. There was a significant correlation in both species between deterrency and toxicity of injected compounds, but little evidence of a relationship between deterrency and oral toxicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00364195
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of ingestion of some non-host plant secondary compounds on larvae of Manduca sexta (1990)
    Springer
    Entomologia experimentalis et applicata 54 (1990), S. 125-130 
    Details
    ISSN: 1570-7458
    Keywords: Manduca sexta ; deterrence ; toxicity ; oligophagy ; plant secondary compound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les effets qui suivent l'ingestion de 7 produits secondaires de plantes non-hôtes ont été examinés sur des chenilles de M. sexta. Ces substances avaient été choisies pour la diversité de leurs effets sur le comportement alimentaire lors d'expériences de courte durée: 4 avaient montré des effets dissuasifs variés, 3 n'en avaient pas présenté. On a enduit des feuilles fraiches de leur plante-hôte (Nicotania tabacum) des différentes substances à raison d'à peu près 1% du poids sec. Seule une substance a réduit les performances des chenilles. Ces résultats ont été discutés en fonction de l'absence de relation entre dissuation et toxicité dans l'évolution des défenses chez les plantes.
    Notes: Abstract Seven non-host plant secondary compounds were tested for their post-ingestional effects on larvae of Manduca cesta Johan. The compounds were selected for their range of effects on feeding behavior in short-term tests: four showed different levels of deterrence while three were not deterrent. Insects were dosed by coating fresh leaves of their food plant (tobacco) with particular compounds at concentrations of 1% dry weight. Only one compound had detrimental effects on larval performance. The results are discussed in the context of the lack of correlation between deterrence and toxicity and the evolution of plant defenses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343521
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  • 3
    Electronic Resource
    Electronic Resource
    Relationship between deterrence and toxicity of plant secondary compounds for the grasshopperSchistocerca americana (1991)
    Springer
    Journal of chemical ecology 17 (1991), S. 2519-2526 
    Details
    ISSN: 1573-1561
    Keywords: Schistocerca americana ; Orthoptera ; Acrididae ; deterrence ; toxicity ; plant defense ; diet breadth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A variety of plant secondary compounds, several of which are quite widespread in nature were tested for their deterrence to the generalist grasshopperSchistocerca americana in short-term behavioral assays. The compounds were coumarin, salicin, tannic acid, gramine, nicotine, quinine, carvone, geraniol, abietic acid, umbelliferone, and ursolic acid. These were then tested for their post-ingestional effects over the whole of the last larval instar. Different methods were employed to mask the taste of compounds that were deterrent in order to ensure that any effects were not due to reduced feeding. In no case was there any indication of a detrimental effect or any trend suggesting one. In two cases, there was a significant increase in growth rate with the addition of the secondary compound to the diet. The evolutionary implications of these findings are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994599
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    Paper (German National Licenses)
    Fulltext
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