
@article {91468,
	title = {A reversal in sensory processing accompanies ongoing ecological divergence and speciation in .},
	journal = {Proc Biol Sci},
	volume = {288},
	year = {2021},
	month = {2021 Mar 31},
	pages = {20210192},
	abstract = {<p>Changes in behaviour often drive rapid adaptive evolution and speciation. However, the mechanistic basis for behavioural shifts is largely unknown. The tephritid fruit fly is an example of ecological specialization and speciation in action via a recent host plant shift from hawthorn to apple. These flies primarily use specific odours to locate fruit, and because they mate only on or near host fruit, changes in odour preference for apples versus hawthorns translate directly to prezygotic reproductive isolation, initiating speciation. Using a variety of techniques, we found a reversal between apple and hawthorn flies in the sensory processing of key odours associated with host fruit preference at the first olfactory synapse, linking changes in the antennal lobe of the brain with ongoing ecological divergence. Indeed, changes to specific neural pathways of any sensory modality may be a broad mechanism for changes in animal behaviour, catalysing the genesis of new biodiversity.</p>
},
	issn = {1471-2954},
	doi = {10.1098/rspb.2021.0192},
	author = {Tait, Cheyenne and Kharva, Hinal and Schubert, Marco and Kritsch, Daniel and Sombke, Andy and Rybak, J{\"u}rgen and Feder, Jeffrey L and Olsson, Shannon B}
}
@article {11586,
	title = {Sensory specificity and speciation: a potential neuronal pathway for host fruit odour discrimination in Rhagoletis pomonella.},
	journal = {Proc Biol Sci},
	volume = {283},
	year = {2016},
	month = {2016 Dec 28},
	abstract = {<p>Behavioural changes in habitat or mate choice can trigger population divergence, leading to speciation. However, little is known about the neurological bases for such changes. Rhagoletis pomonella (Diptera: Tephritidae) is a model for ecological speciation via host plant shifts. Within the past 180 years, Rhagoletis flies infesting hawthorn (Crataegus spp.) shifted to attack domesticated apple (Malus pumila). The two populations differ in their olfactory preferences for apple versus hawthorn fruit. Here, we looked for patterns of sensory organization that may have contributed to this shift by characterizing the morphology, specificity and distribution of olfactory sensory neurons (OSNs) on the antennae of Rhagoletis responding to host fruit and non-host volatiles. Of 28 OSN classes identified, two colocalized OSN pairs were found that specifically responded to the major behavioural attractant and antagonist volatiles for each fly population. A reversal in the response of these OSNs to fruit volatiles, either through a switch in receptor expression between these paired neurons or changes in neuronal projections in the brain, could therefore account for the behavioural difference between apple and hawthorn flies. The finding supports the hypothesis that relatively minor changes in olfactory sensory pathways may contribute to rapid host shifting and divergence in Rhagoletis.</p>
},
	issn = {1471-2954},
	doi = {10.1098/rspb.2016.2101},
	author = {Tait, Cheyenne and Batra, Srishti and Ramaswamy, Sree Subha and Feder, Jeffrey L and Olsson, Shannon B}
}
