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  • 1
    ISSN: 1420-9071
    Keywords: Tephritidae ; Rhagoletis cerasi L ; oviposition-deterring pheromone ; constitution ; purification ; electrophysiology ; contactchemoreceptors ; oviposition behavior ; fast atom bombardment mass spectrometry ; two-dimensional mass spectrometry ; gas chromatography ; mass spectrometry ; 1H-NMR spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An oviposition-deterring pheromone (ODP) of the European cherry fruit flyRhagoletis cerasi L. was isolated from faeces using cellulose and several reverse phase TLC and HPLC procedures. The biological activity was evaluated by means of behavior tests and by electrophysiological recordings from tarsal contact chemoreceptors. The compound was structurally characterized as a N[15(β-glucopyranosyl)oxy-8-hydroxypalmitoyl]-taurine by spectroscopic means. The configurations of C-8 and C-15 of the fatty acid constituent remain to be established by synthetic work.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 34 (1983), S. 277-282 
    ISSN: 1570-7458
    Keywords: Host marking ; Oviposition behaviour ; Oviposition deterrent ; Insect-plant relationships ; Ceutorhynchus assimilis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'examen a porté sur les traits comportementaux responsables de l'observation dans la nature d'une distribution uniforme des œufs de Ceutorhynchus assimilis dans les siliques de Brassica napus. Nous avons observé qu'après chaque acte de dépôt d'œufs dans une silique succède un comportement spécifique et fixé pendant lequel la femelle brosse la surface de la silique avec une structure en brosse de l'ovipositeur. Nous avons pu démontrer que pendant ce brossage, la surface de la silique est marquée chimiquement, ce qui dissuade toute ponte répetée dans la même silique. La discussion porte sur les conséquences écologiques du marquage des siliques par C. assimilis et sur les analogies avec les différents comportements: de marquage d'hôtes chez les insectes.
    Notes: Abstract Behavioural events underlying observations of uniform egg dispersion in field populations of the cabbage seed weevil, Ceutorhynchus assimilis, among winter rape, Brassica napus, seed pods (siliques) were investigated. We observed that each act of egg deposition into a pod was followed by specific and fixed behaviour in which females brushed the pod surface with a brush-like structure on the ovipositor. Evidence is provided that chemical marking of the pod surface occurs during brushing, resulting in deterrence of repeated oviposition into the same pod. Ecological implications of pod marking by cabbage seed weevils as well as similarities with the corresponding behaviour of various host marking insects are discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 30 (1981), S. 169-175 
    ISSN: 1570-7458
    Keywords: insect-plant relationships ; host plant selection ; oak flea weevil ; Rhynchaenus quercus ; olfaction ; electroantennograms ; plant volatiles ; leaf vapours
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Elektroantennographische Aufzeichnungen an Fühlern einer hochspezialisierten phytophagen Art, des Eichenblattflohs Rhynchaenus quercus L. zeigten zwei allgemeine Eigenschaften des Geruchsystems der Antennen: Erstens ist eine hohe und teilweise selektive Empfindlichkeit auf chemotaxonomisch nicht spezifische Verbindungen, besonders auf die “allgemeinen Blattgründämpfe” wie auch auf Geraniol und Linalool vorhanden. Zweitens fehlen ausgeprägte Unterschiede im allgemeinen Erregungsniveau hervorgerufen durch flüchtige Stoffe von Wirtspflanzen einerseits und Nichtwirtspflanzen andererseits. Es wurde auch beobachtet, dass die Form der EAGs hervorgerufen durch zerschnittene Blätter oder “allgemeine Blattgründämpfe” verschieden war von denjenigen verursacht durch Geraniol und Linalool, wo die Erholung eindeutig langsamer war. Die Resultate der EAG deuten darauf hin, dass der Komplex der “allgemeinen Blattgründämpfe” wichtig ist bei der Wahrnehmung der Wirtspflanzengerüche durch Rhynchaenus quercus. Eine mögliche Funktion dieser Verbindungen bei der Erkennung der Wirtspflanzen wird diskutiert.
    Notes: Abstract Electroantennogram (EAG) recordings from the antennae of a highly specialized phytophagous species — the oak flea weevil, Rhynchaenus quercus L. — revealed two general properties of its antennal olfactory system: (1) a high and to some extent selective sensitivity to chemotaxonomically nonspecific compounds, namely the so-called “general green leaf volatiles” as well as to geraniol and linalool, (2) a lack of marked differences in the general excitation level caused by stimulation with vapours from leaves of both host plants and non-host plants. It was also observed, that the shapes of EAG's evoked by vapours from cut leaves and general green leaf volatiles differed from those elicited by corresponding concentrations of geraniol and linalool, where recovery was distinctly slower. The results of EAG tests suggest that the general green leaf volatile complex is important in host-odour perception by the oak flea weevil. A possible function of these compounds in host-plant odour discrimination is discussed.
    Type of Medium: Electronic Resource
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