Pubblicazione scientifica

The sense of hearing in the Pacific oyster, Magallana gigas

FILONE TECNOLOGICO	TEMA
economia circolare e sostenibilità
produzione e cattura
produzione e raccolta

RIASSUNTO

There is an increasing concern that anthropogenic noise could have a significant impact on the marine environment, but there is still insufficient data for most invertebrates. What do they perceive? We investigated this question in oysters Magallana gigas (Crassostrea gigas) using pure tone exposures, accelerometer fixed on the oyster shell and hydrophone in the water column. Groups of 16 oysters were exposed to quantifiable waterborne sinusoidal sounds in the range of 10 Hz to 20 kHz at various acoustic energies. The experiment was conducted in running seawater using an experimental flume equipped with suspended loudspeakers. The sensitivity of the oysters was measured by recording their valve movements by high-frequency noninvasive valvometry. The tests were 3 min tone exposures including a 70 sec fade-in period. Three endpoints were analysed: the ratio of responding individuals in the group, the resulting changes of valve opening amplitude and the response latency. At high enough acoustic energy, oysters transiently closed their valves in response to frequencies in the range of 10 to <1000 Hz, with maximum sensitivity from 10 to 200 Hz. The minimum acoustic energy required to elicit a response was 0.02 m∙s-2 at 122 dBrms re 1 μPa for frequencies ranging from 10 to 80 Hz. As a partial valve closure cannot be differentiated from a nociceptive response, it is very likely that oysters detect sounds at lower acoustic energy. The mechanism involved in sound detection and the ecological consequences are discussed.

DATA

Data di pubblicazione: 25/10/2017

AUTORI

CHARIFI MOHCINE
SOW MOHAMEDOU
CIRET PIERRE
BENOMAR SOUMAYA
MASSABUAU JEAN-CHARLES

ENTE DI AFFERENZA

UNIV BORDEAUX EPOC UMR 5805 ARCACHON FRANCE
CNRS EPOC UMR 5805 TALENCE FRANCE
UNIT OF RSCH ON BIOLOGICAL RHYTHMS NEUROSCIENCE & ENVIRONMENT FACULTY OF SCIENCE MOHAMMED V AGDAL UNIV RABAT MOROCCO
BIGELOW LAB FOR OCEAN SCIENCES US

RIVISTA

PLoS ONE, 12(10), e0185353

IMPACT FACTOR

2,870

indietro