Pubblicazione scientifica

Change in singing behavior of humpback whales caused by shipping noise

FILONE TECNOLOGICO	TEMA
economia circolare e sostenibilità
produzione e cattura

RIASSUNTO

Reactions of singing behavior of individual humpback whales (Megaptera novaeangliae) to a specific shipping noise were examined. Two autonomous recorders separated by 3.0 km were used for the acoustic monitoring of each individual song sequence. A passenger-cargo liner was operated once per day, and other large ship noise was excluded given the remote location of the Ogasawara Islands, 1000 km south of Tokyo. In total, locations of between 26 and 27 singers were measured acoustically using time arrival difference at both stereo recorders on the ship presence and absence days, respectively. Source level of the ship (157 dB rms re 1μPa) was measured separately in deep water. Fewer whales sang nearby, within 500 m, of the shipping lane. Humpback whales reduced sound production after the ship passed, when the minimum distance to the whale from the ship trajectory was 1200 m. In the Ogasawara water, humpback whales seemed to stop singing temporarily rather than modifying sound characteristics of their song such as through frequency shifting or source level elevation. This could be a cost effective adaptation because the propagation loss at 500 m from the sound source is as high as 54 dB. The focal ship was 500 m away within several minutes. Responses may differ where ship traffic is heavy, because avoiding an approaching ship may be difficult when many sound sources exist.

DATA

Data di pubblicazione: 24/10/2018

AUTORI

TSUJII KOKI
AKAMATSU TOMONARI
OKAMOTO RYOSUKE
MORI KYOICHI
MITANI YOKO
UMEDA NAOYA

ENTE DI AFFERENZA

OGASAWARA WHALE WATCHING ASSOC
GRADUATE SCHOOL OF ENVIRONMENTAL SCIENCE HOKKAIDO UNIV HAKODATE HOKKAIDO JAPAN
NATL RSCH INST FISHERIES SCIENCE JAPAN FISHERIES RSCH & EDUCATION AGENCY FUKUURA KANAGAWA JAPAN
TEIKYO UNIV SCIENCE UENOHARA YAMANASHI JAPAN
FIELD SCIENCE CTR NORTHERN BIOSPHERE HOKKAIDO UNIV HAKODATE HOKKAIDO JAPAN
OSAKA UNIV SUITA OSAKA JAPAN
SANYA INST DEEP SEA SCIENCE & ENG CHINESE ACAD SCIENCES CHINA

RIVISTA

PLoS ONE, 13(10), e0204112

IMPACT FACTOR

2,870

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