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CHEMOECOLOGY

, Volume 5, Issue 3–4, pp 173–183 | Cite as

Ladybird defence alkaloids: Structural, chemotaxonomic and biosynthetic aspects (Col.: Coccinellidae)

  • Désiré Daloze
  • Jean-Claude Braekman
  • Jacques M. Pasteels
Seminar papers

Summary

The defensive mechanisms which protect ladybird beetles (Coccinellidae) against predators are reviewed. Besides behavioural mechanisms, such as thanatosis and reflex bleeding, chemical defence mechanisms are playing a prevalent role. Indeed, ladybirds are protected not only by their smell, but also by repulsive alkaloids, most of which are considered to be of autogenous origin. In a few cases, dietarily-acquired substances are also involved. Particular emphasis is laid on the repellent alkaloids which are contained in the haemolymph of many species. The structures of 34 nitrogen-containing compounds isolated so far are presented, and their distribution within the family is discussed in the light of the most widely accepted classification of these beetles. To conclude, the mode of release of the alkaloids, their variation through the life cycle and their repellent and toxic properties are discussed, as well as the few biosynthetic data yet available.

Key words

chemical defence sequestration reflex bleeding alkaloids chemotaxonomy biosynthesis repellency toxicity Coleoptera Coccinellidae 

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Copyright information

© Birkhäuser Verlag 1995

Authors and Affiliations

  • Désiré Daloze
    • 1
  • Jean-Claude Braekman
    • 1
  • Jacques M. Pasteels
    • 2
  1. 1.Laboratory of Bio-organic ChemistryUniversity of BrusselsBrusselsBelgium
  2. 2.Laboratory of Animal and Cellular BiologyUniversity of BrusselsBrusselsBelgium

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