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Artificial selection on relative brain size reveals a positive genetic correlation between brain size and proactive personality in the guppy
Department of Ecology & Genetics/Animal Ecology, Uppsala University, Sweden.ORCID iD: 0000-0003-3473-1402
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2014 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 68, no 4, 1139-1149 p.Article in journal (Refereed) Published
Abstract [en]

Animal personalities range from individuals that are shy, cautious, and easily stressed (a reactive personality type) to individuals that are bold, innovative, and quick to learn novel tasks, but also prone to routine formation (a proactive personality type). Although personality differences should have important consequences for fitness, their underlying mechanisms remain poorly understood. Here, we investigated how genetic variation in brain size affects personality. We put selection lines of large- and small-brained guppies (Poecilia reticulata), with known differences in cognitive ability, through three standard personality assays. First, we found that large-brained animals were faster to habituate to, and more exploratory in, open field tests. Large-brained females were also bolder. Second, large-brained animals excreted less cortisol in a stressful situation (confinement). Third, large-brained animals were slower to feed from a novel food source, which we interpret as being caused by reduced behavioral flexibility rather than lack of innovation in the large-brained lines. Overall, the results point toward a more proactive personality type in large-brained animals. Thus, this study provides the first experimental evidence linking brain size and personality, an interaction that may affect important fitness-related aspects of ecology such as dispersal and niche exploration.

Place, publisher, year, edition, pages
2014. Vol. 68, no 4, 1139-1149 p.
Keyword [en]
personality, guppy, Poecilia reticulate, cognition, Brain size
National Category
Behavioral Sciences Biology Zoology
URN: urn:nbn:se:su:diva-103284DOI: 10.1111/evo.12341ISI: 000333553500017OAI: diva2:718215


Available from: 2014-05-20 Created: 2014-05-12 Last updated: 2015-05-12Bibliographically approved

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