Lifespan behavioural and neural resilience in a social insect

Giraldo, Ysabel Milton, Kamhi, J. Frances, Fourcassie, Vincent, Moreau, Mathieu, Robson, Simon K.A., Rusakov, Adina, Wimberly, Lindsey, Diloreto, Alexandria, Kordek, Adrianna, and Traniello, James F.A. (2016) Lifespan behavioural and neural resilience in a social insect. Proceedings of the Royal Society of London Series B, Biological Sciences, 283 (1822). pp. 1-9.

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Abstract

Analyses of senescence in social species are important to understanding how group living influences the evolution of ageing in society members. Social insects exhibit remarkable lifespan polyphenisms and division of labour, presenting excellent opportunities to test hypotheses concerning ageing and behaviour. Senescence patterns in other taxa suggest that behavioural performance in ageing workers would decrease in association with declining brain functions. Using the ant Pheidole dentata as a model, we found that 120-day-old minor workers, having completed 86% of their laboratory lifespan, showed no decrease in sensorimotor functions underscoring complex tasks such as alloparenting and foraging. Collaterally, we found no age-associated increases in apoptosis in functionally specialized brain compartments or decreases in synaptic densities in the mushroom bodies, regions associated with integrative processing. Furthermore, brain titres of serotonin and dopamine—neuromodulators that could negatively impact behaviour through age-related declines—increased in old workers. Unimpaired task performance appears to be based on the maintenance of brain functions supporting olfaction and motor coordination independent of age. Our study is the first to comprehensively assess lifespan task performance and its neurobiological correlates and identify constancy in behavioural performance and the absence of significant age-related neural declines.

Item ID: 42237
Item Type: Article (Research - C1)
ISSN: 1471-2954
Keywords: Formicidae, life history, division of labour
Funders: National Institute on Ageing (NIA), National Science Foundation (NSF), Boston University Undergraduate Research Opportunity Program
Projects and Grants: NIA F31AG041589, NSF IOB 0725013 and IOS 1354291
Research Data: http://dx.doi.org/10.5061/dryad.m280g
Date Deposited: 25 Jul 2016 22:14
FoR Codes: 06 BIOLOGICAL SCIENCES > 0608 Zoology > 060805 Animal Neurobiology @ 20%
06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060304 Ethology and Sociobiology @ 80%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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