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Attraction modulated by spacing of pheromone components and anti-attractants in a bark beetle and a moth

Författare:
Publiceringsår: 2011
Språk: Engelska
Sidor: 899-911
Publikation/Tidskrift/Serie: Journal of Chemical Ecology
Volym: 37
Dokumenttyp: Artikel i tidskrift
Förlag: Springer

Sammanfattning

Orientation for insects in olfactory landscapes

with high semiochemical diversity may be a challenging

task. The partitioning of odor plumes into filaments that are

interspersed with pockets of ‘clean air’ may help filament

discrimination and upwind flight to attractive sources in the

face of inhibitory signals. We studied the effect of distance

between odor sources on trap catches of the beetle, Ips

typographus, and the moth, Spodoptera littoralis. Insects

were tested both to spatially separated pheromone components

[cis-verbenol and 2-methyl-3-buten-2-ol for Ips; (Z,E)-

9,11-tetradecadienyl acetate and (Z,E)-9,12-tetradecadienyl

acetate for Spodoptera], and to separated pheromone and

anti-attractant sources [non-host volatile (NHV) blend for

Ips; (Z)-9-tetradecenyl acetate for Spodoptera]. Trap catch

data were complemented with simulations of plume structure

and plume overlap from two separated sources using a photo

ionization detector and soap bubble generators. Trap catches

of the beetle and the moth were both affected when odor

sources in the respective traps were increasingly separated.

However, this effect on trap catch occurred at smaller

(roughly by an order of magnitude) odor source separation

distances for the moth than for the beetle. This may reflect

differences between the respective olfactory systems and

central processing. For both species, the changes in trap

catches in response to separation of pheromone components

occurred at similar spacing distances as for separation of

pheromone and anti-attractant sources. Overlap between two

simulated plumes depended on distance between the two

sources. In addition, the number of detected filaments and

their concentration decreased with downwind distance. This

implies that the response to separated odor sources in the

two species might take place under different olfactory

conditions. Deploying multiple sources of anti-attractant

around a pheromone trap indicated long-distance (meter

scale) effects of NHVon the beetle and a potential use for

NHV in forest protection.

Nyckelord

  • Biological Sciences
  • Zoology
  • Odor-source spacing
  • Semiochemical diversity hypothesis
  • Plume structure
  • Antagonist . Anti-attractant . Non-host volatiles . Field trapping . Photo ionization detector. Coleoptera . Curculionidae . Scolytinae . Scolytidae . Lepidoptera . Noctuidae

Övriga

Published
  • Pheromone Group
  • ISSN: 1573-1561

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