کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8627068 | 1568632 | 2018 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Do high sound pressure levels of crowing in roosters necessitate passive mechanisms for protection against self-vocalization?
ترجمه فارسی عنوان
آیا فشارهای بالای فشار صدا در جادوگران نیاز به مکانیسم منفعل برای محافظت در مقابل خودکشی دارند؟
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کلمات کلیدی
مرغ خانگی، سطح فشار صوت، کلاغ، کانال گوش خارجی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
High sound pressure levels (>120Â dB) cause damage or death of the hair cells of the inner ear, hence causing hearing loss. Vocalization differences are present between hens and roosters. Crowing in roosters is reported to produce sound pressure levels of 100Â dB measured at a distance of 1Â m. In this study we measured the sound pressure levels that exist at the entrance of the outer ear canal. We hypothesize that roosters may benefit from a passive protective mechanism while hens do not require such a mechanism. Audio recordings at the level of the entrance of the outer ear canal of crowing roosters, made in this study, indeed show that a protective mechanism is needed as sound pressure levels can reach amplitudes of 142.3Â dB. Audio recordings made at varying distances from the crowing rooster show that at a distance of 0.5Â m sound pressure levels already drop to 102Â dB. Micro-CT scans of a rooster and chicken head show that in roosters the auditory canal closes when the beak is opened. In hens the diameter of the auditory canal only narrows but does not close completely. A morphological difference between the sexes in shape of a bursa-like slit which occurs in the outer ear canal causes the outer ear canal to close in roosters but not in hens.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Zoology - Volume 126, February 2018, Pages 65-70
Journal: Zoology - Volume 126, February 2018, Pages 65-70
نویسندگان
Raf Claes, Pieter G.G. Muyshondt, Joris J.J. Dirckx, Peter Aerts,