Hearing in large (Eidolon helvum) and small (Cynopterus brachyotis) non-echolocating fruit bats
Hearing in large (Eidolon helvum) and small (Cynopterus brachyotis) non-echolocating fruit bats
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DOI：
10.1016/j.heares.2006.06.008
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发表时间：
2006-11-01
期刊：
影响因子：
2.8
通讯作者：
Heffner, H. E.
中科院分区：
文献类型：
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作者：
Heffner, R. S.;Koay, G.;Heffner, H. E.
比较回声定位蝙蝠和非回声定位蝙蝠的听力，可以深入了解回声定位对更基本的听力的影响。为此，我们测定了两种非回声定位蝙蝠的听力，一种是稻草色的果蝠(Eidolon Helvum)，一种是大型(230-350克)的非洲果蝠，另一种是狗脸果蝠(Cynopterus Brachyotis)，一种原产于印度和东南亚的小型(3045克)蝙蝠。用果汁奖励的条件性抑制/回避程序进行测试。在60dBSPL时，海藻的听力范围在1.38~41 kHz之间，在8 kHz时灵敏度最高；短角毛藻的听力范围在2.63~70 kHz之间，在10 kHz时灵敏度最高。与目前测试的所有其他蝙蝠一样，这两种蝙蝠都听不到500赫兹以下的声音，这表明它们可能不会使用时间代码来感知音调。对回声定位蝙蝠和非回声定位蝙蝠高频听力的比较表明，喉部回声定位的使用导致了对高频听力的额外选择压力。然而，小型非回声定位哺乳动物的典型高频敏感性足以支持蝙蝠早期进化中的初始回声定位，这一发现支持回声定位的多种来源的可能性。(C)2006爱思唯尔B.V.保留所有权利。
Comparing the hearing abilities of echolocating and non-echolocating bats can provide insight into the effect of echolocation on more basic hearing abilities. Toward this end, we determined the audiograms of two species of non-echolocating bats, the straw-colored fruit bat (Eidolon helvum), a large (230-350 g) African fruit bat, and the dog-faced fruit bat (Cynopterus brachyotis), a small (3045 g) bat native to India and Southeast Asia. A conditioned suppression/avoidance procedure with a fruit juice reward was used for testing. At 60 dB SPL, the hearing range of E. helvum extends from 1.38 to 41 kHz with best sensitivity at 8 kHz; the hearing range of C brachyotis extends from 2.63 to 70 kHz with best sensitivity at 10 kHz. As with all other bats tested so far, neither species was able to hear below 500 Hz, suggesting that they may not use a time code for perceiving pitch. Comparison of the high-frequency hearing abilities of echolocating and non-echolocating bats suggests that the use of laryngeal echolocation has resulted in additional selective pressure to hear high frequencies. However, the typical high-frequency sensitivity of small non-echolocating mammals would have been sufficient to support initial echolocation in the early evolution of bats, a finding that supports the possibility of multiple origins of echolocation. (c) 2006 Elsevier B.V. All rights reserved.