You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Brain Size Predicts the Success of Mammal Species Introduced into Novel Environments
Daniel Sol, Sven Bacher, Simon M. Reader and Louis Lefebvre
The American Naturalist
Vol. 172, No. S1, Genetics of Colonizing SpeciesA Symposium Organized by Trevor D. Price (July 2008), pp. S63-S71
Stable URL: http://www.jstor.org/stable/10.1086/588304
Page Count: 9
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Abstract: Large brains, relative to body size, can confer advantages to individuals in the form of behavioral flexibility. Such enhanced behavioral flexibility is predicted to carry fitness benefits to individuals facing novel or altered environmental conditions, a theory known as the brain size–environmental change hypothesis. Here, we provide the first empirical link between brain size and survival in novel environments in mammals, the largest‐brained animals on Earth. Using a global database documenting the outcome of more than 400 introduction events, we show that mammal species with larger brains, relative to their body mass, tend to be more successful than species with smaller brains at establishing themselves when introduced to novel environments, when both taxonomic and regional autocorrelations are accounted for. This finding is robust to the effect of other factors known to influence establishment success, including introduction effort and habitat generalism. Our results replicate similar findings in birds, increasing the generality of evidence for the idea that enlarged brains can provide a survival advantage in novel environments.
© 2008 by The University of Chicago.