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    Social complexity influences brain investment and neural operation costs in ants

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    Name:
    Kamhi_et_al._2016_PRSb_final_a ...
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    Description:
    Final Accepted Manuscript
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    Author
    Kamhi, J. Frances cc
    Gronenberg, Wulfila
    Robson, Simon K. A. cc
    Traniello, James F. A.
    Affiliation
    Univ Arizona, Dept Neurosci
    Issue Date
    2016-10-19
    Keywords
    metabolic cost
    social brain evolution
    polymorphism
    collective intelligence
    cytochrome oxidase
    
    Metadata
    Show full item record
    Publisher
    ROYAL SOC
    Citation
    Social complexity influences brain investment and neural operation costs in ants 2016, 283 (1841):20161949 Proceedings of the Royal Society B: Biological Sciences
    Journal
    Proceedings of the Royal Society B: Biological Sciences
    Rights
    © 2016 The Author(s) Published by the Royal Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The metabolic expense of producing and operating neural tissue required for adaptive behaviour is considered a significant selective force in brain evolution. In primates, brain size correlates positively with group size, presumably owing to the greater cognitive demands of complex social relationships in large societies. Social complexity in eusocial insects is also associated with large groups, as well as collective intelligence and division of labour among sterile workers. However, superorganism phenotypes may lower cognitive demands on behaviourally specialized workers resulting in selection for decreased brain size and/or energetic costs of brain metabolism. To test this hypothesis, we compared brain investment patterns and cytochrome oxidase (COX) activity, a proxy for ATP usage, in two ant species contrasting in social organization. Socially complex Oecophylla smaragdina workers had larger brain size and relative investment in the mushroom bodies (MBs)-higher order sensory processing compartments-than the more socially basic Formica subsericea workers. Oecophylla smaragdina workers, however, had reduced COX activity in the MBs. Our results suggest that as in primates, ant group size is associated with large brain size. The elevated costs of investment in metabolically expensive brain tissue in the socially complex O. smaragdina, however, appear to be offset by decreased energetic costs.
    Note
    Published 19 October 2016; 12 month embargo.
    ISSN
    0962-8452
    1471-2954
    DOI
    10.1098/rspb.2016.1949
    Version
    Final accepted manuscript
    Sponsors
    National Science Foundation (NSF) East Asia and Pacific Summer Institute [1209967]; NSF [IOB-0725013, IOS-1354291]; Australian Research Council [1093553]
    Additional Links
    http://rspb.royalsocietypublishing.org/lookup/doi/10.1098/rspb.2016.1949
    ae974a485f413a2113503eed53cd6c53
    10.1098/rspb.2016.1949
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