Aquatic Mammals (2002)
The characteristics of echolocation signals used by a harbour porpoise (Phocoena phocoena) during a target detection experiment are described. A water-filled steel sphere (either 5.08 or 7.62 cm in diameter)…
Acoustic signals from free-ranging finless porpoises (Neophocaena phocaenoides) in the waters around Hong Kong
Goold, J. C.; Jefferson, T. A.
The Raffles Bulletin of Zoology (2002)
Acoustic signals from free-ranging finless porpoises were recorded in the waters around Hong Kong during March 2000. Finless porpoises produced short-duration high-frequency clicks. Signal analysis showed finless porpoise clicks to…
Echolocation behavior of harbor porpoises Phocoena phocoena around chemically enhanced gill nets
Cox, T. M.; Read, A. J.
Marine Ecology Progress Series (2004)
The echolocation behavior of harbor porpoises Phocoena phocoena around gillnets was monitored to test their response to chemically (BaSO4) enhanced gill nets, designed to be more acoustically reflective than commercial…
Diel variation in echolocation behavior of wild harbor porpoises
Carlstrom, Julia
Marine Mammal Science (2005)
The echolocation rate and behavior of wild harbor porpoises were studied using a harbor porpoise click detector (POD) deployed close to the bottom at 40 m depth in Scottish waters,…
Spatial orientation in echolocating harbour porpoises (Phocoena phocoena)
Verfuss, U. K.
Journal of Experimental Biology (2005)
Studies concerning the echolocation behaviour of odontocetes focus mainly on target detection and discrimination, either in stationary animals or in animals approaching a specific target. We present the first data…
Receiving beam patterns in the horizontal plane of a harbor porpoise (Phocoena phocoena)
Kastelein, Ronald A.; Janssen, Mirjam; Verboom, Willem C.; de Haan, Dick
The Journal of the Acoustical Society of America (2005)
Receiving beam patterns of a harbor porpoise were measured in the horizontal plane, using narrow-band frequency modulated signals with center frequencies of 16, 64, and 100kHz. Total signal duration was…
New stereo acoustic data logger for free-ranging dolphins and porpoises
Akamatsu, Tomonari; Matsuda, Akihiko; Suzuki, Shiro; Wang, Ding; Wang, Kexiong; Suzuki, Michihiko; Muramoto, Hiroyuki; Sugiyama, Naoki; Oota, Katsunori
Marine Technology Society Journal (2005)
To observe the bio-sonar behavior of dolphins and porpoises, a miniature stereo acoustic data logger was developed to record the echolocation clicks of small cetaceans. The 'A-tag' device is small…
Reactions of captive harbor porpoises (Phocoena phocoena) to pinger-like sounds
Teilmann, Jonas; Tougaard, Jakob; Miller, Lee A.; Kirketerp, Tim; Hansen, Kirstin; Brando, Sabrina
Marine Mammal Sci (2006)
Pingers on gill nets can reduce bycatch of harbor porpoises. If harbor porpoises habituate to pingers, the effect may be reduced or lost. Two captive harbor porpoises were exposed to…
Acoustic radiation from the head of echolocating harbor porpoises (Phocoena phocoena)
Au, W. W. L.
Journal of Experimental Biology (2006)
An experiment was conducted to investigate the sound pressure patterns on the melon of odontocetes by using four broadband hydrophones embedded in suction cups to measure echolocation signals on the…
Reduction of harbour porpoise (Phocoena phocoena) bycatch by iron-oxide gillnets
Larsen, F.; Ritzau Eigaard, O.; Tougaard, J.
Fisheries Research (2007)
Reduction of harbour porpoise bycatch by use of high-density iron-oxide (IO) gillnets was tested in sea trials in the Danish North Sea bottom set gillnet fishery in September–October 2000. The…