Walsh, Stig A, Barrett, Paul M. , Milner, Angela C , Manley, Geoffrey and Witmer, Lawrence M (2009) Inner ear anatomy is a proxy for deducing auditory capability and behaviour in reptiles and birds. Proceedings of the Royal Society B: Biological Sciences, 276 (1660). 1355-1360 . ISSN 0962-8452

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Abstract

Inferences of hearing capabilities and audition-related behaviours in extinct reptiles and birds have previously been based on comparing cochlear duct dimensions with those of living species. However, the relationship between inner-ear bony anatomy and hearing ability or vocalization has never been tested rigorously in extant or fossil taxa. Here, micro-computed tomographic analysis is used to investigate whether simple endosseous cochlear duct (ECD) measurements can be fitted to models of hearing sensitivity, vocalization, sociality and environmental preference in 59 extant reptile and bird species, selected based on their vocalization ability. Length, rostrocaudal/mediolateral width and volume measurements were taken from ECD virtual endocasts and scaled to basicranial length. Multiple regression of these data with measures of hearing sensitivity, vocal complexity, sociality and environmental preference recovered positive correlations between ECD length and hearing range/mean frequency, vocal complexity, the behavioural traits of pair bonding and living in large aggregations, and a negative correlation between ECD length/rostrocaudal width and aquatic environments. No other dimensions correlated with these variables. Our results suggest that ECD length can be used to predict mean hearing frequency and range in fossil taxa, and that this measure may also predict vocal complexity and large group sociality given comprehensive datasets.

Item Type: Article
Additional Information: Published online 13 January 2009
Uncontrolled Keywords: Reptile Bird Basilar Papilla Cochlear Duct Hearing Vocalization
Subjects: Q Science > QH Natural history > QH301 Biology
Theme: Understanding the natural world
Department: Natural Sciences
Related URLs:
Depositing User: Mark Glancy
Date Deposited: 06 Apr 2010 16:14
Last Modified: 06 Jul 2011 10:52
URI: http://repository.nms.ac.uk/id/eprint/85

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