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Anatomical organization of the brain of a diurnal and a nocturnal dung beetle

Immonen, Esa‐Ville; Dacke, Marie; Heinze, Stanley; el Jundi, Basil (2017-01-11)

 
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https://doi.org/10.1002/cne.24169

Immonen, Esa‐Ville
Dacke, Marie
Heinze, Stanley
el Jundi, Basil
John Wiley & Sons
11.01.2017

Immonen E.‐V., Dacke M, Heinze S, el Jundi B. Anatomical organization of the brain of a diurnal and a nocturnal dung beetle. J Comp Neurol. 2017;525:1879–1908. https://doi.org/10.1002/cne.24169.

https://rightsstatements.org/vocab/InC/1.0/
© 2017 Wiley Periodicals, Inc. This is the peer reviewed version of the following article: Immonen E.‐V., Dacke M, Heinze S, el Jundi B. Anatomical organization of the brain of a diurnal and a nocturnal dung beetle. J Comp Neurol. 2017;525:1879–1908. https://doi.org/10.1002/cne.24169, which has been published in final form at https://doi.org/10.1002/cne.24169. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
https://rightsstatements.org/vocab/InC/1.0/
doi:https://doi.org/10.1002/cne.24169
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Abstract

To avoid the fierce competition for food, South African ball‐rolling dung beetles carve a piece of dung off a dung‐pile, shape it into a ball and roll it away along a straight line path. For this unidirectional exit from the busy dung pile, at night and day, the beetles use a wide repertoire of celestial compass cues. This robust and relatively easily measurable orientation behavior has made ball‐rolling dung beetles an attractive model organism for the study of the neuroethology behind insect orientation and sensory ecology. Although there is already some knowledge emerging concerning how celestial cues are processed in the dung beetle brain, little is known about its general neural layout. Mapping the neuropils of the dung beetle brain is thus a prerequisite to understand the neuronal network that underlies celestial compass orientation. Here, we describe and compare the brains of a day‐active and a night‐active dung beetle species based on immunostainings against synapsin and serotonin. We also provide 3D reconstructions for all brain areas and many of the fiber bundles in the brain of the day‐active dung beetle. Comparison of neuropil structures between the two dung beetle species revealed differences that reflect adaptations to different light conditions. Altogether, our results provide a reference framework for future studies on the neuroethology of insects in general and dung beetles in particular.

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