caa a22 4500 469095792 CHVBK 20180323133030.0 cr unu---uuuuu 170328e19921001xx s 000 0 eng 10.1007/BF00317264 doi (NATIONALLICENCE)springer-10.1007/BF00317264 Hilker Monika Lehrstuhl für Tierökologie II, Universität Bayreuth, P.O. Box 101251, W-8580, Bayreuth, Federal Republic of Germany aut Protective devices of early developmental stages in Pyrrhalta viburni (Coleoptera, Chrysomelidae) [Elektronische Daten] [Monika Hilker] Summary: Larvae and eggs of the leaf beetle Pyrrhalta viburni were investigated for protective devices against predators. The eggs are covered with faeces, which appeared to have no feeding deterrent activity against the ant Myrmica sabuleti. Chemical analyses of the material covering the eggs by gas chromatography-mass spectrometry (GC-MS) showed the triterpenes α-amyrin and β-amyrin as main components. Both compounds are also present in the hostplant Viburnum lantana. GC-MS analyses of eggs and larvae showed that 1,8-dihydroxy-3-methylanthraquinone (=chrysophanol) was present in both developmental stages. In the larvae, 1,8-dihydroxyanthraquinone (=chrysazin) and 1,8,9-trihydroxyanthracene (dithranol) were also detected. Neither hydroxylated anthraquinones nor dithranol were found in bark and leaf extracts of the hostplant. After assessing the total amounts of these compounds in a single larva, their ecological significance was studied in feeding bioassays with M. sabuleti. Both P. viburni larvae and equivalent amounts of anthraquinones and dithranol deterred feeding by the ants. The role of anthraquinones and triterpenes in P. viburni is discussed. Springer-Verlag, 1992 Chrysomelidae nationallicence Eggs nationallicence Larvae nationallicence Triterpenes nationallicence Anthraquinones nationallicence Oecologia Springer-Verlag 92/1(1992-10-01), 71-75 0029-8549 92:1<71 1992 92 442 https://doi.org/10.1007/BF00317264 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317264 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Hilker Monika Lehrstuhl für Tierökologie II, Universität Bayreuth, P.O. Box 101251, W-8580, Bayreuth, Federal Republic of Germany aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 92/1(1992-10-01), 71-75 0029-8549 92:1<71 1992 92 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer