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Social and environmental olfactory signals mediate insect behavioral ecology and evolution

Borrero-Echeverry, Felipe (2016). Social and environmental olfactory signals mediate insect behavioral ecology and evolution. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2016:65
ISBN 978-91-576-8632-9
eISBN 978-91-576-8633-6
[Doctoral thesis]

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Odors are essential in mediating insect reproductive behavior. Environmental odors help insects locate suitable feeding or egg-laying sites and avoid suboptimal hosts or dangerous habitats. Sex pheromones, on the other hand, are responsible for mate finding and elicit courtship and mating. Although pheromones elicit stereotypical behaviors on their own, they are embedded in a background of environmental odors in nature. Using the cotton leafworm, Spodoptera littoralis, and the common fruit fly, Drosophila melanogaster, I studied the effect of blending environmentally relevant odors with pheromones on insect behavior.

For the cotton leafworm, we first developed an attractive cotton volatile blend. We next used this blend to determine the physiological effect of DMNT, a strong behavioral antagonist, on the cotton leafworm olfactory system. I then blended the individual volatiles and volatile blends with an incomplete and complete pheromone. The combination of cotton volatiles and the complete pheromone elicits attraction. Deviations from this optimum, either by changing the pheromone composition or the cotton volatile blend strongly reduces male S. littoralis attraction.

I then used the fruit fly to study the effect of food (vinegar) and habitat (yeast) volatiles on fly attraction towards pheromones. Starvation affects attraction towards a blend of vinegar and a male produced pheromone in a sexually dimorphic way. We next describe a novel female fruit fly pheromone and the odorant receptor involved in its perception. Finally, we show that vinegar and yeast volatiles interact in a different manner with male and female produced pheromones, suggesting that although vinegar is a good feeding cue, even in the presence of pheromones, it is not an appropriate mate finding cue.

My findings suggest that pheromones and host volatiles function as a single unit that mediates insect behavior, rather than as individual components. As such the olfactory cues that mediate mate finding in insects are under both natural and sexual selection simultaneously, which has strong implications for insect speciation and evolution.

Authors/Creators:Borrero-Echeverry, Felipe
Title:Social and environmental olfactory signals mediate insect behavioral ecology and evolution
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :18 May 2016
Depositing date:18 May 2016
Number of Pages:62
IBorrero-Echeverry, F., Becher, P.G., Birgersson, G.Å.O., Bengtsson, M., Witzgall, P., and Saveer, A.M. (2015). Flight attraction of Spodoptera littoralis (Lepidoptera, Noctuidae) to cotton headspace and synthetic volatile blends. Frontiers in Ecology and Evolution 3, 56.
IIHatano, E., Saveer, A., Borrero-Echeverry, F., Strauch, M., Zakir, A., Bengtsson, M., Ignell, R., Anderson, P., Becher, P., Witzgall, P., and Dekker, T. (2015). A herbivore-induced plant volatile interferes with host plant and mate location in moths through suppression of olfactory signaling pathways. BMC Biology 13, 75.
IIIBorrero-Echeverry, F., Bengtsson, M., Witzgall, P. Blends of host plant volatiles and sex pheromones encode specific mate recognition in moths. (Manuscript).
IVLebreton, S., Borrero-Echeverry, F., Gonzalez, F., Solum, M., Wallin, E., Trona, F., Grabe, V., Sachse, S., Hedenström, E., Hansson, B.S., Bengtsson, M., Birgersson, G., Walker, W.B., Dweck, H., Witzgall, P., Becher, P. (2015). Feeding regulates sex pheromone attraction and courtship in Drosophila females. Scientific Reports 5, 13132.
VLebreton S., Borrero-Echeverry F., Gonzalez F., Trona F., Solum M., Wallin E., Grabe V., Sachse S., Bengtsson M., Hansson B.S., Hedenström E., Birgersson G., Dweck H., Witzgall P., Becher P.G. 2016. The scent of the fly. (Manuscript).
VIBorrero-Echeverry F., Witzgall, P., Becher, P.G. Drosophila sex pheromones synergize vinegar and yeast attraction. (Manuscript)
Place of Publication:Alnarp
Publisher:Department of Plant Protection Biology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8632-9
ISBN for electronic version:978-91-576-8633-6
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:H Protection of plants and stored products > H10 Pests of plants
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Behavioural Sciences Biology
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Evolutionary Biology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Agrovoc terms:spodoptera littoralis, drosophila melanogaster, pest insects, reproductive behaviour, sex pheromones, olfaction, host plants, volatile compounds, chemical ecology, defence mechanisms, natural selection
Keywords:Spodoptera littoralis, Drosophila melanogaster, pheromones, host volatiles, chemical ecology, olfaction, host plant volatiles, herbivore-induced plant volatiles, sexual selection, natural selection
Permanent URL:
ID Code:13387
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Plant Protection Biology
External funders:FORMAS
Deposited By: Mr Felipe Borrero
Deposited On:19 May 2016 08:50
Metadata Last Modified:10 Sep 2020 13:41
Project info:
Name:Insect Chemical Ecology, Ethology and Ecolution

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