Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-38869
van Woerden, J T; van Schaik, C P; Isler, K (2010). Effects of seasonality on brain size evolution: evidence from strepsirrhine primates. American Naturalist, 176(6):758-767.
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Seasonal changes in energy supply impose energetic constraints that affect many physiological and behavioral characteristics of organisms. As brains are costly, we predict brain size to be relatively small in species that experience a higher degree of seasonality (expensive brain framework). Alternatively, it has been argued that larger brains give animals the behavioral flexibility to buffer the effects of habitat seasonality (cognitive buffer hypothesis). Here, we test these two hypotheses in a comparative study on strepsirrhine primates (African lorises and Malagasy lemurs) that experience widely varying degrees of seasonality. We found that experienced seasonality is negatively correlated with relative brain size in both groups, controlling for the effect of phylogenetic relationships and possible confounding variables such as the extent of folivory. However, relatively larger-brained lemur species tend to experience less variation in their dietary intake than indicated by the seasonality of their habitat. In conclusion, we found clear support for the hypothesis that seasonality restricts brain size in strepsirrhines as predicted by the expensive brain framework and weak support for the cognitive buffer hypothesis in lemurs.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Anthropological Institute and Museum|
|Dewey Decimal Classification:||300 Social sciences, sociology & anthropology|
|Deposited On:||24 Jan 2011 10:07|
|Last Modified:||12 Dec 2013 13:08|
|Publisher:||University of Chicago Press|
|Free access at:||Publisher DOI. An embargo period may apply.|
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