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Sexual dimorphism in visual and olfactory brain centers in the perfume‐collecting orchid bee Euglossa dilemma (Hymenoptera, Apidae)

Insect mating behavior is controlled by a diverse array of sex‐specific traits and strategies that evolved to maximize mating success. Orchid bees exhibit a unique suite of perfume‐mediated mating behaviors. Male bees collect volatile compounds from their environment to concoct species‐specific perf...

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Autores principales: Brand, Philipp, Larcher, Virginie, Couto, Antoine, Sandoz, Jean‐Christophe, Ramírez, Santiago R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley & Sons, Inc. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6174972/
https://www.ncbi.nlm.nih.gov/pubmed/30088672
http://dx.doi.org/10.1002/cne.24483
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author Brand, Philipp
Larcher, Virginie
Couto, Antoine
Sandoz, Jean‐Christophe
Ramírez, Santiago R.
author_facet Brand, Philipp
Larcher, Virginie
Couto, Antoine
Sandoz, Jean‐Christophe
Ramírez, Santiago R.
author_sort Brand, Philipp
collection PubMed
description Insect mating behavior is controlled by a diverse array of sex‐specific traits and strategies that evolved to maximize mating success. Orchid bees exhibit a unique suite of perfume‐mediated mating behaviors. Male bees collect volatile compounds from their environment to concoct species‐specific perfume mixtures that are presumably used to attract conspecific females. Despite a growing understanding of the ecology and evolution of chemical signaling in orchid bees, many aspects of the functional adaptations involved, in particular regarding sensory systems, remain unknown. Here we investigated male and female brain morphology in the common orchid bee Euglossa dilemma Bembé & Eltz. Males exhibited increased relative volumes of the Medulla, a visual brain region, which correlated with larger compound eye size (area). While the overall volume of olfactory brain regions was similar between sexes, the antennal lobes exhibited several sex‐specific structures including one male‐specific macroglomerulus. These findings reveal sexual dimorphism in both the visual and the olfactory system of orchid bees. It highlights the tendency of an increased investment in the male visual system similar to that observed in other bee lineages, and suggests that visual input may play a more important role in orchid bee male mating behavior than previously thought. Furthermore, our results suggest that the evolution of perfume communication in orchid bees did not involve drastic changes in olfactory brain morphology compared to other bee lineages.
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spelling pubmed-61749722018-10-15 Sexual dimorphism in visual and olfactory brain centers in the perfume‐collecting orchid bee Euglossa dilemma (Hymenoptera, Apidae) Brand, Philipp Larcher, Virginie Couto, Antoine Sandoz, Jean‐Christophe Ramírez, Santiago R. J Comp Neurol Research Articles Insect mating behavior is controlled by a diverse array of sex‐specific traits and strategies that evolved to maximize mating success. Orchid bees exhibit a unique suite of perfume‐mediated mating behaviors. Male bees collect volatile compounds from their environment to concoct species‐specific perfume mixtures that are presumably used to attract conspecific females. Despite a growing understanding of the ecology and evolution of chemical signaling in orchid bees, many aspects of the functional adaptations involved, in particular regarding sensory systems, remain unknown. Here we investigated male and female brain morphology in the common orchid bee Euglossa dilemma Bembé & Eltz. Males exhibited increased relative volumes of the Medulla, a visual brain region, which correlated with larger compound eye size (area). While the overall volume of olfactory brain regions was similar between sexes, the antennal lobes exhibited several sex‐specific structures including one male‐specific macroglomerulus. These findings reveal sexual dimorphism in both the visual and the olfactory system of orchid bees. It highlights the tendency of an increased investment in the male visual system similar to that observed in other bee lineages, and suggests that visual input may play a more important role in orchid bee male mating behavior than previously thought. Furthermore, our results suggest that the evolution of perfume communication in orchid bees did not involve drastic changes in olfactory brain morphology compared to other bee lineages. John Wiley & Sons, Inc. 2018-08-08 2018-09-01 /pmc/articles/PMC6174972/ /pubmed/30088672 http://dx.doi.org/10.1002/cne.24483 Text en © 2018 The Authors. The Journal of Comparative Neurology Published by Wiley Periodicals, Inc. This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
spellingShingle Research Articles
Brand, Philipp
Larcher, Virginie
Couto, Antoine
Sandoz, Jean‐Christophe
Ramírez, Santiago R.
Sexual dimorphism in visual and olfactory brain centers in the perfume‐collecting orchid bee Euglossa dilemma (Hymenoptera, Apidae)
title Sexual dimorphism in visual and olfactory brain centers in the perfume‐collecting orchid bee Euglossa dilemma (Hymenoptera, Apidae)
title_full Sexual dimorphism in visual and olfactory brain centers in the perfume‐collecting orchid bee Euglossa dilemma (Hymenoptera, Apidae)
title_fullStr Sexual dimorphism in visual and olfactory brain centers in the perfume‐collecting orchid bee Euglossa dilemma (Hymenoptera, Apidae)
title_full_unstemmed Sexual dimorphism in visual and olfactory brain centers in the perfume‐collecting orchid bee Euglossa dilemma (Hymenoptera, Apidae)
title_short Sexual dimorphism in visual and olfactory brain centers in the perfume‐collecting orchid bee Euglossa dilemma (Hymenoptera, Apidae)
title_sort sexual dimorphism in visual and olfactory brain centers in the perfume‐collecting orchid bee euglossa dilemma (hymenoptera, apidae)
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6174972/
https://www.ncbi.nlm.nih.gov/pubmed/30088672
http://dx.doi.org/10.1002/cne.24483
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