The use of seal scarers as a protective mitigation measure can induce hearing impairment in harbour porpoises.
J Acoust Soc Am
; 146(6): 4288, 2019 12.
Article
em En
| MEDLINE
| ID: mdl-31893707
ABSTRACT
Acoustic deterrent devices (ADDs) are used to deter seals from aquacultures but exposure of harbour porpoises (Phocoena phocoena) occurs as a side-effect. At construction sites, by contrast, ADDs are used to deter harbour porpoises from the zone in which pile driving noise can induce temporary threshold shifts (TTSs). ADDs emit such high pressure levels that there is concern that ADDs themselves may induce a TTS. A harbour porpoise in human care was exposed to an artificial ADD signal with a peak frequency of 14 kHz. A significant TTS was found, measured by auditory evoked potentials, with an onset of 142 dB re 1 µPa2s at 20 kHz and 147 dB re 1 µPa2s at 28 kHz. The authors therefore strongly recommend to gradually increase and down regulate source levels of ADDs to the desired deterrence range. However, further research is needed to develop a reliable relationship between received levels and deterrence.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Comportamento Animal
/
Phocoena
/
Audição
/
Perda Auditiva
Limite:
Animals
Idioma:
En
Revista:
J Acoust Soc Am
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Alemanha