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Rearing-Group Size Determines Social Competence and Brain Structure in a Cooperatively Breeding Cichlid
Stockholm University, Faculty of Science, Department of Zoology, Ethology.
Number of Authors: 4
2015 (English)In: American Naturalist, ISSN 0003-0147, E-ISSN 1537-5323, Vol. 186, no 1, 123-140 p.Article in journal (Refereed) Published
Abstract [en]

Social animals can greatly benefit from well-developed social skills. Because the frequency and diversity of social interactions often increase with the size of social groups, the benefits of advanced social skills can be expected to increase with group size. Variation in social skills often arises during ontogeny, depending on early social experience. Whether variation of social-group sizes affects development of social skills and related changes in brain structures remains unexplored. We investigated whether, in a cooperatively breeding cichlid, early group size (1) shapes social behavior and social skills and (2) induces lasting plastic changes in gross brain structures and (3) whether the development of social skills is confined to a sensitive ontogenetic period. Rearing-group size and the time juveniles spent in these groups interactively influenced the development of social skills and the relative sizes of four main brain regions. We did not detect a sensitive developmental period for the shaping of social behavior within the 2-month experience phase. Instead, our results suggest continuous plastic behavioral changes over time. We discuss how developmental effects on social behavior and brain architecture may adaptively tune phenotypes to their current or future environments.

Place, publisher, year, edition, pages
2015. Vol. 186, no 1, 123-140 p.
Keyword [en]
developmental plasticity, early environment, environmental matching, social competence, sensitive periods, brain development
National Category
Biological Sciences
URN: urn:nbn:se:su:diva-119134DOI: 10.1086/681636ISI: 000356632700013OAI: diva2:843767
Available from: 2015-07-31 Created: 2015-07-29 Last updated: 2015-07-31Bibliographically approved

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