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  Host plant-driven sensory specialization in Drosophila erecta

Linz, J., Baschwitz, A., Strutz, A., Dweck, H., Sachse, S., Hansson, B., et al. (2013). Host plant-driven sensory specialization in Drosophila erecta. Proceedings of the Royal Society B: Biological Sciences, 280: 20130626. doi:10.1098/rspb.2013.0626.

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http://dx.doi.org/10.1098/rspb.2013.0626 (Publisher version)
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 Creators:
Linz, Jeanine1, 2, Author              
Baschwitz, Amelie1, 2, Author              
Strutz, Antonia1, 2, Author              
Dweck, Hany1, 2, Author              
Sachse, Silke3, Author              
Hansson, Bill1, Author              
Stensmyr, Marcus Carl1, Author              
Affiliations:
1Department of Evolutionary Neuroethology, Prof. B. S. Hansson, MPI for Chemical Ecology, Max Planck Society, ou_421894              
2IMPRS on Ecological Interactions, MPI for Chemical Ecology, Max Planck Society, Jena, DE, ou_421900              
3BMBF Research Group Dr. S. Sachse, Olfactory Coding, Department of Neuroethology, Prof. B. S. Hansson, MPI for Chemical Ecology, Max Planck Society, ou_421914              

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 Abstract: Finding appropriate feeding and breeding sites is crucial for all insects. To fulfil this vital task, many insects rely on their sense of smell. Alterations in the habitat—or in lifestyle—should accordingly also be reflected in the olfactory system. Solid functional evidence for direct adaptations in the olfactory system is however scarce. We have, therefore, examined the sense of smell of Drosophila erecta, a close relative of Drosophila melanogaster and specialist on screw pine fruits (Pandanus spp.). In comparison with three sympatric sibling species, D. erecta shows specific alterations in its olfactory system towards detection and processing of a characteristic Pandanus volatile (3-methyl-2- butenyl acetate, 3M2BA). We show that D. erecta is more sensitive towards this substance, and that the increased sensitivity derives from a numerical increase of one olfactory sensory neuron (OSN) class. We also show that axons from these OSNs form a complex of enlarged glomeruli in the antennal lobe, the first olfactory brain centre, of D. erecta. Finally, we show that 3M2BA induces oviposition in D. erecta, but not in D. melanogaster. The presumed adaptations observed here follow to a remarkable degree those found in Drosophila sechellia, a specialist upon noni fruit, and suggest a general principle for how specialization affects the sense of smell.

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 Dates: 2013-03-262013-04-17
 Publication Status: Published online
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 Identifiers: Other: Han181
DOI: 10.1098/rspb.2013.0626
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Title: Proceedings of the Royal Society B: Biological Sciences
Source Genre: Journal
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Publ. Info: London : Royal Society
Pages: - Volume / Issue: 280 Sequence Number: 20130626 Start / End Page: - Identifier: ISSN: 0962-8452
CoNE: https://pure.mpg.de/cone/journals/resource/110975500577295_2