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Journal Article

Volatile foraging kairomones in the littoral zone: Attraction of an herbivorous freshwater gastropod to algal odors

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons56672

Fink,  Patrick
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons56660

Von Elert,  Eric
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Citation

Fink, P., Von Elert, E., & Jüttner, F. (2006). Volatile foraging kairomones in the littoral zone: Attraction of an herbivorous freshwater gastropod to algal odors. Journal of Chemical Ecology, 32(9), 1867-1881. doi:10.1007/s10886-006-9115-y.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-D848-F
Abstract
Volatile organic compounds (VOCs) produced by algae and cyanobacteria are primarily responsible for odors in fresh waters. Among other functions, VOCs may serve as important infochemicals in biofilms of benthic primary producers. VOCs liberated by benthic, mat-forming cyanobacteria can be used as habitat-finding cues by insects, nematodes, and possibly other organisms. We developed a new gastropod behavioral assay that allows detection of food preference without offering food, thus allowing the distinction between taste, which requires direct contact with the food source, and the detection of odorous infochemicals, which work over distance. We demonstrated that VOCs released from disintegrated cells of a benthic, mat-forming, green alga (Ulothrix fimbriata) are food-finding cues ("foraging kairomones") that attract the herbivorous freshwater snail Radix ovata. A mixture of three C-5 lipoxygenase compounds and 2(E),4(E)-heptadienal that mimic the major VOCs released by U. fimbriata attracted the snails, whereas neither the mixture of C-5 compounds nor 2(E),4(E)-heptadienal were effective when given alone. This study suggests that VOCs can play a steering role as infochemicals in freshwater benthic habitats, as has been established for many organismic interactions in terrestrial ecosystems.