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Evolution of brain-body allometry in Lake Tanganyika cichlids.
Evolutionary Biology Centre, Department of Ecology and Genetics/Animal Ecology, Uppsala University, Uppsala, Sweden.
Department of Zoology/Ethology, Stockholm University, Stockholm, Sweden.
Department of Zoology/Ethology, Stockholm University, Stockholm, Sweden.
Department of Zoology/Ethology, Stockholm University, Stockholm, Sweden.
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2016 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 70, no 7, 1559-1568 p.Article in journal (Refereed) Published
Abstract [en]

Brain size is strongly associated with body size in all vertebrates. This relationship has been hypothesized to be an important constraint on adaptive brain size evolution. The essential assumption behind this idea is that static (i.e., within species) brain-body allometry has low ability to evolve. However, recent studies have reported mixed support for this view. Here, we examine brain-body static allometry in Lake Tanganyika cichlids using a phylogenetic comparative framework. We found considerable variation in the static allometric intercept, which explained the majority of variation in absolute and relative brain size. In contrast, the slope of the brain-body static allometry had relatively low variation, which explained less variation in absolute and relative brain size compared to the intercept and body size. Further examination of the tempo and mode of evolution of static allometric parameters confirmed these observations. Moreover, the estimated evolutionary parameters indicate that the limited observed variation in the static allometric slope could be a result of strong stabilizing selection. Overall, our findings suggest that the brain-body static allometric slope may represent an evolutionary constraint in Lake Tanganyika cichlids.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2016. Vol. 70, no 7, 1559-1568 p.
Keyword [en]
Allometry, brain–body allometry, brain evolution, constraints, Lake Tanganyika cichlid, phylogenetic comparative analysis.
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:liu:diva-130556DOI: 10.1111/evo.12965ISI: 000380023200011PubMedID: 27241216OAI: oai:DiVA.org:liu-130556DiVA: diva2:953043
Note

Funding agencies: Japanese Student Services Organization (JASSO); Zoologiska foundation; Davis Expedition Fund grant; Helge Axelsson Johnson grant; Stiftelsen Hierta-Retzius stipendiefond grant; Austrian Science Fund [J 3304-B24]; Swedish Research Council [621-2012-3624]

Available from: 2016-08-16 Created: 2016-08-16 Last updated: 2016-08-22

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