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Titolo:
Effect of anthropogenic low-frequency noise on the foraging ecology of Balaenoptera whales
Autore:
Croll, DA; Clark, CW; Calambokidis, J; Ellison, WT; Tershy, BR;
Indirizzi:
Univ Calif Santa Cruz, Inst Marine Sci, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 i, Santa Cruz, CA 95064 USA Cornell Univ, Ornithol Lab, Bioacoust Res Program, Ithaca, NY 14850 USA Cornell Univ Ithaca NY USA 14850 acoust Res Program, Ithaca, NY 14850 USA Cascadia Res Collect, Olympia, WA 98501 USA Cascadia Res Collect Olympia WA USA 98501 Collect, Olympia, WA 98501 USA Marine Acoust Inc, Litchfield, CT 06759 USA Marine Acoust Inc Litchfield CT USA 06759 t Inc, Litchfield, CT 06759 USA
Titolo Testata:
ANIMAL CONSERVATION
, volume: 4, anno: 2001,
parte:, 1
pagine: 13 - 27
SICI:
1367-9430(200102)4:<13:EOALNO>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
CALIFORNIA CURRENT SYSTEM; MEGAPTERA-NOVAEANGLIAE; BALAENA-MYSTICETUS; HUMPBACK WHALES; MARINE MAMMALS; BOWHEAD WHALES; BEHAVIOR; ABUNDANCE; PACIFIC; HABITAT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Croll, DA Univ Calif Santa Cruz, Inst Marine Sci, Santa Cruz, CA 95064 USAUniv Calif Santa Cruz Santa Cruz CA USA 95064 ruz, CA 95064 USA
Citazione:
D.A. Croll et al., "Effect of anthropogenic low-frequency noise on the foraging ecology of Balaenoptera whales", ANIM CONSER, 4, 2001, pp. 13-27

Abstract

The human contribution to ambient noise in the ocean has increased over the past 50 years, and is dominated by low-frequency (LF) sound (frequencies < 1000 Hz) from shipping, oil and gas development, defence-related and research activities. Mysticete whales, including six endangered species, mag; be at risk from this noise pollution because all species produce and probably perceive low-frequency sound. We conducted a manipulative field experiment to test the effects of loud, LF noise on foraging fin blue (B. musculus) and (Balaenoptera physalus) whales off San Nicolas Island, California. Naive observers used a combination of attached tracking devices, ship-based surveys, aerial surveys, photo-identification and passive monitoring of vocal behaviour to examine the behaviour and distribution of whales when a loud LF source (US Navy SURTASS LFA) was and was not transmitting. During transmission, 12-30% of the estimated received levels of LFA of whales in the study area exceeded 140 dB re 1 mua. However, whales continued to be seen foraging in the region. Overall, whale encounter rates and diving behaviour appeared to be more strongly linked to changes in prey abundance associated with oceanographic parameters than to LF sound transmissions. In some cases, whale vocal behaviour was significantly different between experimental and non-experimental periods.. However, these differences were nor consistent and did not appear to be related to LF sound transmissions. Rt the spatial and temporal scales examined, we found no obvious responses of whales to a loud, anthropogenic, LF sound. We suggest that the cumulative effects of anthropogenic LF noise over larger temporal and spatial scales than examined here may be a more important consideration for management agencies.

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Documento generato il 29/09/20 alle ore 00:26:36