Implementation of a method to visualize noise-induced hearing loss in mass stranded cetaceans

M Morell, A Brownlow, B McGovern, SA Raverty, RE Shadwick, M Andre

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2 Citations (Scopus)
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Abstract

Assessment of the impact of noise over-exposure in stranded cetaceans is challenging, as the lesions that lead to hearing loss occur at the cellular level and inner ear cells are very sensitive to autolysis. Distinguishing ante-mortem pathology from post-mortem change has been a major constraint in diagnosing potential impact. Here, we outline a methodology applicable to the detection of noise-induced hearing loss in stranded cetaceans. Inner ears from two mass strandings of long-finned pilot whales in Scotland were processed for scanning electron microscopy observation. In one case, a juvenile animal, whose ears were fixed within 4 hours of death, revealed that many sensory cells at the apex of the cochlear spiral were missing. In this case, the absence of outer hair cells would be compatible with overexposure to underwater noise, affecting the region which transduces the lowest frequencies of the pilot whales hearing spectrum. Perfusion of cochlea with fixative greatly improved preservation and enabled diagnostic imaging of the organ of Corti, even 30 hours after death. This finding supports adopting a routine protocol to detect the pathological legacy of noise overexposure in mass stranded cetaceans as a key to understanding the complex processes and implications that lie behind such stranding events.
Original languageEnglish
JournalScientific Reports
Volume7
Issue number41848
Early online date6 Feb 2017
DOIs
Publication statusFirst published - 6 Feb 2017

Fingerprint

Noise-Induced Hearing Loss
Pilot Whales
Noise
Cochlea
Inner Ear
Outer Auditory Hair Cells
Organ of Corti
Autolysis
Fixatives
Scotland
Diagnostic Imaging
Hearing Loss
Electron Scanning Microscopy
Hearing
Ear
Perfusion
Observation
Pathology

Cite this

Morell, M ; Brownlow, A ; McGovern, B ; Raverty, SA ; Shadwick, RE ; Andre, M. / Implementation of a method to visualize noise-induced hearing loss in mass stranded cetaceans. In: Scientific Reports. 2017 ; Vol. 7, No. 41848.
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Implementation of a method to visualize noise-induced hearing loss in mass stranded cetaceans. / Morell, M; Brownlow, A; McGovern, B; Raverty, SA; Shadwick, RE; Andre, M.

In: Scientific Reports, Vol. 7, No. 41848, 06.02.2017.

Research output: Contribution to journalArticleResearchpeer-review

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