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TZUNTIL:20111030T010000Z
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DTSTART:20091025T030000
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DTSTAMP:20260820T013422Z
DESCRIPTION:Eingeladen durch Prof. Klaus H. Hoffmann  Volatile cues release
 d from insect habitats\, single plants or other animals play a key role in
  the foraging process of herbivores and carnivores. Resource-indicating od
 ors encountered by insects in their natural environment need to be detecte
 d within a huge variety of other environmental odors and are often both co
 mplex and variable mixtures themselves. I will address the questions how f
 oraging insects cope with the problems of complexity and variability of th
 e infochemical web and how this complexity arises in multitrophic interact
 ions itself. First I will present studies showing two different strategies
  for insects to deal with odor complexity: a) avoiding areas with enhanced
  plant and odor diversity and b) “digging through” all the odorous informa
 tion. A successful way to disentangle complex odorous information is the c
 ombined use of innate odor preferences and learning\, which enhances the h
 ost finding success of a foraging egg parasitoid.  Second I will detail ho
 w a plant releases a blend of volatiles after feeding and egg deposition b
 y an insect herbivore and how these induced volatiles attract an egg paras
 itoid. Quantitative headspace analysis of the field elm revealed mainly te
 rpenoids. To figure out which terpenoids play an important role for elms i
 n “talking” to egg parasitoids\, terpene formation was inhibited physiolog
 ically and the odour of oviposition induced\, terpenoid inhibited plants w
 as offered to the parasitoids in olfactometer bioassays. I will outline ho
 w molecular ecological approaches (using EST databases\, proteomics\, tran
 sgenic elms) might help to unravel the regulation\, emission and perceptio
 n of these synomones in a complex odorous environment.
DTSTART;TZID=Europe/Berlin:20100107T161500
DTEND;TZID=Europe/Berlin:20100107T174500
LOCATION:H6
SUMMARY:Dr. Torsten Meiners\, Angewandte Zoologie/Ökologie der Tiere\, FU B
 erlin: Chemical diversity in tritrophic interactions - when things get com
 plex
TRANSP:TRANSPARENT
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