Brain size and behavioral specialization in the jataí stingless bee (Tetragonisca angustula).
behavioral specialization
jataí bees
neural plasticity
optic lobes
soldier subcaste
Journal
The Journal of comparative neurology
ISSN: 1096-9861
Titre abrégé: J Comp Neurol
Pays: United States
ID NLM: 0406041
Informations de publication
Date de publication:
09 2022
09 2022
Historique:
revised:
11
04
2022
received:
12
08
2021
accepted:
13
04
2022
pubmed:
6
5
2022
medline:
15
7
2022
entrez:
5
5
2022
Statut:
ppublish
Résumé
Social insects are instructive models for understanding the association between investment in brain size and behavioral variability because they show a relatively simple nervous system associated with a large set of complex behaviors. In the jataí stingless bee (Tetragonisca angustula), division of labor relies both on age and body size differences among workers. When young, both minors and soldiers engage in intranidal tasks and move to extranidal tasks as they age. Minors switch to foraging activities, while soldiers take over defensive roles. Nest defense performed by soldiers includes two different tasks: (1) hovering around the nest entrance for the detection and interception of heterospecific bees (a task relying mostly on vision) and (2) standing at the nest entrance tube for inspection of returning foragers and discrimination against conspecific non-nestmates based on olfactory cues. Here, using different-sized individuals (minors and soldiers) as well as same-sized individuals (hovering and standing soldiers) performing distinct tasks, we investigated the effects of both morphological and behavioral variability on brain size. We found a negative allometric growth between brain size and body size across jataí workers, meaning that minors had relatively larger brains than soldiers. Between soldier types, we found that hovering soldiers had larger brain compartments related to visual processing (the optic lobes) and learning (the mushroom bodies). Brain size differences between jataí soldiers thus correspond to behavioral specialization in defense (i.e., vision for hovering soldiers) and illustrate a functional neuroplasticity underpinning division of labor.
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
2304-2314Subventions
Organisme : Conselho Nacional de Desenvolvimento Científico e Tecnológico
ID : 169292/2017-7
Organisme : Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil
Organisme : Fondation Fyssen (France)
Organisme : Agence Nationale de la Recherche (ANR) - France
ID : ANR-20-CE34-0017-01
Informations de copyright
© 2022 Wiley Periodicals LLC.
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