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a Comparative Test of the Correlated Evolution of Flightlessness and Relative Brain Size in Birds

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dc.contributor.author Iwaniuk, Andrew N. en
dc.contributor.author Nelson, John E. en
dc.contributor.author James, Helen F. en
dc.contributor.author Olson, Storrs L. en
dc.date.accessioned 2006-04-20T19:28:21Z
dc.date.available 2006-04-20T19:28:21Z
dc.date.issued 2004
dc.identifier.citation Iwaniuk, Andrew N., Nelson, John E., James, Helen F., and Olson, Storrs L. 2004. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F215">a Comparative Test of the Correlated Evolution of Flightlessness and Relative Brain Size in Birds</a>." <em>Journal of zoology</em>. 263 (3):317&ndash;327. en
dc.identifier.issn 0952-8369
dc.identifier.uri http://hdl.handle.net/10088/215
dc.description.abstract Abstract Secondary flightlessness has evolved independently many times in birds. Morphological changes in the pectoral girdle and flight feathers and changes in body size have been associated with the evolution of flightlessness, and it has also been suggested that flightless birds have relatively small brains. We therefore tested whether flightlessness is related to changes in relative brain size. Relative brain size was compared between volant and flightless species using both conventional statistics and modern comparative methods within nine taxonomic groups. No significant difference was found between flightless and volant species in six of these groups, regardless of whether body mass or tibiotarsal measurements were used as estimates of body size. Species with relatively smaller brains compared with their volant relatives were the great auk Pinguinus impennis, the kakapo Strigops habroptilus and some species of penguin. Thus, we found no evidence of a general correlation between the evolution of secondary flightlessness and the evolution of relatively small brains in birds. This suggests that neural requirements are not significantly different between flightless and volant species, although our methods may have overlooked subtle neurological changes that do not result in markedly different endocranial volumes. en
dc.format.extent 160986 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.relation.ispartof Journal of zoology en
dc.title a Comparative Test of the Correlated Evolution of Flightlessness and Relative Brain Size in Birds en
dc.type Journal Article en
dc.identifier.srbnumber 59964
rft.jtitle Journal of zoology
rft.volume 263
rft.issue 3
rft.spage 317
rft.epage 327
dc.description.SIUnit NH-Vertebrate Zoology en
dc.description.SIUnit NMNH en
dc.citation.spage 317
dc.citation.epage 327


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