Morphological Adaptations of the Ear in the Rodent Family Heteromyidae |
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| Authors: | WEBSTER DOUGLAS B; WEBSTER MOLLY |
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| Institution: | Kresge Hearing Research Laboratory of the South Department of Otorhinolaryngology, Louisiana State University Medical Center New Orleans, Louisiana 70119 |
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| Abstract: | Middle and inner ear structure and auditory sensitivity havebeen studied in all five genera of the rodent family Heteromyidae.In the most xericc genera (Dipodomys and Microdipodops) themiddle ears are greatly inflated the tympano-ossicular systemvery efficient the organ of Corti extremely modified and low-frequencysensitivity extremely acute. In the most mesic genera (Heteromysand Liomys) the middle and inner ears show few modificationsand the low frequency sensitivity is rather poor. Perognathusis intermediate in habitat structure, and low frequency sensitivity.Experimental data demonstrate that the low frequency sensitivityin Dipodomys is adaptive in predator avoidance. |
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