Relationships of cochlear coiling shape and hearing frequencies in cetaceans, and the occurrence of infrasonic hearing in Miocene Mysticeti
Relationships of cochlear coiling shape and hearing frequencies in cetaceans, and the occurrence of infrasonic hearing in Miocene Mysticeti
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DOI：
10.5194/fr-21-33-2018
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发表时间：
2018-01
期刊：
影响因子：
1.4
通讯作者：
Indira S. Ritsche;J. Fahlke;F. Wieder;A. Hilger;I. Manke;O. Hampe
中科院分区：
文献类型：
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作者：
Indira S. Ritsche;J. Fahlke;F. Wieder;A. Hilger;I. Manke;O. Hampe
摘要。众所周知，须鲸（神秘鲸）使用低频（LF； 200赫兹及以下）和次声（20千赫），达到低频。研究人员试图通过将内耳耳蜗的形状或单个耳蜗的测量值与已知的听力频率联系起来，并对灭绝物种进行推断，来了解神秘动物中低频和次声听力的进化。利用基于地标的完整耳蜗盘绕形状分析，我们发现耳蜗盘绕形状与鲸类动物的低频和高频（HF; > - 10 kHz）听力极限相关。极低频（≤50赫兹）和次声听力与突出的第二圈、下降的顶点和大量的圈有关。耳蜗与颅形变量以及耳蜗与颅形之间的相关性表明，低低频听力限制与较长的耳蜗和相对较大的颅宽有关。中新世中期出现了极低频听觉，中新世晚期出现了极低频听觉。完整的耳蜗盘绕法适用于鲸类动物的听力极限估计，近似为耳蜗长度乘以耳蜗转动次数。
Abstract. Baleen whales (Mysticeti) are known to use low frequencies (LF; 200 Hz and below) and infrasound ( 20 kHz), reach low frequencies. Researchers have tried to understand the evolution of LF and infrasonic hearing in mysticetes by linking the shape of the inner ear cochlea or individual cochlear measurements to known hearing frequencies and making inferences to extinct species. Using landmark-based shape analysis of complete cochlear coiling, we show that cochlear coiling shape correlates with LF and high-frequency (HF; > 10 kHz) hearing limits in cetaceans. Very LF ( ≤ 50 Hz) and infrasonic hearing are associated with, for example, a protruding second turn, a descending apex, and a high number of turns. Correlations between cochlear and cranial variables and cochlear and cranial shape indicate that low LF hearing limits are furthermore connected to longer cochleae and relatively larger cranial widths. Very LF hearing in Mysticeti appeared in the middle Miocene, and mysticete infrasonic hearing had evolved by the late Miocene. Complete cochlear coiling is suitable for estimating hearing limits in cetaceans, closely approximated by cochlear length times number of cochlear turns.