Presentation Details
| Population-level divergence in olfactory coding and odor-guided behavior in Drosophila mojavensis Dilini Karunappuli Herath Mudiyanselage, John E.Layne , Stephanie M.Rollmann . University of Cincinnati, Cincinnati, OH, USA |
Abstract
Host plant specialization is a key driver of ecological divergence, shaping both sensory systems and behavior in insects. Geographically isolated populations of Drosophila mojavensis, each specializing on a chemically distinct cactus host, comprise a powerful model for studying how variation in sensory systems contributes to divergence. Here we examine how differences in olfactory coding correspond to odor-guided behavior in two populations. We video-tracked behavioral responses to 39 odorants using a T-maze assay and calculated response indices, capturing attraction and avoidance behavior. Both populations responded robustly to multiple odorants but differed significantly in their magnitude of response to several cactus-associated odorants, suggesting population-specific tuning to host relevant cues. Using a regression model, we examined associations between olfactory sensory neuron function and odor-guided behavior to test whether a minimal subset of OSNs can predict behavioral responses.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
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