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The inner ear in the group of archosaurs (birds, crocodilians, and extinct dinosaurs) shows a high degree of structural similarity,
enabling predictions of their function in extinct species based on relationships among similar variables in living birds.
Behavioral audiograms and morphological data on the length of the auditory sensory epithelium (the basilar papilla) are available
for many avian species. By bringing different data sets together, we show that body mass and the size of the basilar papilla
are significantly correlated, and the most sensitive frequency in a given species is inversely related to the body mass and
the length of the basilar papilla. We also demonstrate that the frequency of best hearing is correlated with the high-frequency
limit of hearing. Small species with a short basilar papilla hear higher frequencies compared with larger species with a longer
basilar papilla. Based on the regression analysis of two significant correlations in living archosaurs (best audiogram frequency
vs body mass and best audiogram frequency vs papillar length), we suggest that hearing in large dinosaurs was restricted to
low frequencies with a high-frequency limit below 3 kHz.
Supplementary material is available in the online version of this article at and accessible for authorised users. 相似文献
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