Marine Mammal Science (2017)
...There is, unfortunately, no unbiased way to assess the prey preference and dietary intake of free-ranging marine mammals like harbor porpoises. Although the traditional approach involving stomach content analysis of…
Hearing thresholds of a male and a female harbor porpoise (Phocoena phocoena)
Kastelein, Ronald A.; Helder-Hoek, Lean; Van de Voorde, Shirley
The Journal of the Acoustical Society of America (2017)
To study intra-species variability in audiograms, the hearing sensitivity of a six-year-old female and a three-year-old male harbor porpoise was measured by using a standard psycho-acoustic technique under low ambient…
Biosonar signal propagation in the harbor porpoise’s (Phocoena phocoena) head: The role of various structures in the formation of the vertical beam
Wei, Chong; Au, Whitlow W. L.; Ketten, Darlene R.; Song, Zhongchang; Zhang, Yu
The Journal of the Acoustical Society of America (2017)
Harbor porpoises (Phocoena phocoena) use narrow band echolocation signals for detecting and locating prey and for spatial orientation. In this study, acoustic impedance values of tissues in the porpoise's head…
Grey seal attacks on harbour porpoises in the Eastern Scheldt: Cases of survival and mortality
Podt, A. E.; IJsseldijk, L. L.
Lutra (2017)
In the southern North Sea, hundreds of mutilated harbour porpoise carcasses (Phocoena phocoena) are found each year on beaches. Recent studies have confirmed that these concern the remains of predation…
Group characteristics, site fidelity, and photo-identification of harbor porpoises, Phocoena phocoena, in Burrows Pass, Fidalgo Island, Washington
Elliser, Cindy R.; MacIver, Katrina H.; Green, Michelle
Marine Mammal Science (2017)
Little is known about harbor porpoises at the individual level or local group structure. Group characteristics, site fidelity, and photo‐identification of harbor porpoises were investigated off Fidalgo Island, Washington State.…
Temporary hearing threshold shift in a harbor porpoise (Phocoena phocoena) after exposure to multiple airgun sounds
Kastelein, Ronald A.; Helder-Hoek, Lean; Van de Voorde, Shirley; von Benda-Beckmann, Alexander M.; Lam, Frans-Peter A.; Jansen, Erwin; de Jong, Christ A. F.; Ainslie, Michael A.
The Journal of the Acoustical Society of America (2017)
In seismic surveys, reflected sounds from airguns are used under water to detect gas and oil below the sea floor. The airguns produce broadband high-amplitude impulsive sounds, which may cause…
Estimating effective detection area of static passive acoustic data loggers from playback experiments with cetacean vocalisations
Nuuttila, Hanna K.; Brundiers, Katharina; Dähne, Michael; Koblitz, Jens C.; Thomas, Len; Courtene‐Jones, Winnie; Evans, Peter G. H.; Turner, John R.; Bennell, Jim D.; Hiddink, Jan G.
Methods in Ecology and Evolution (2018)
Passive acoustic monitoring (PAM) is used for many vocal species. However, few studies have quantified the fraction of vocalisations captured, and how animal distance and sound source level affect detection…
Abundance of harbour porpoises (Phocoena phocoena) on the Dutch continental shelf, aerial surveys 2012-2017
Geelhoed, S. C. V.; Scheidat, M.
Lutra (2018)
The harbour porpoise (Phocoena phocoena) is the most abundant marine mammal species in Dutch waters. Aerial surveys along predesigned track lines in 2012-2017 provided density and abundance estimates for the…
The metabolic cost of swimming and reproduction in harbor porpoises (Phocoena phocoena) as predicted by a bioenergetic model
Gallagher, Cara A.; Stern, S. Jonathan; Hines, Ellen
Marine Mammal Science (2018)
While harbor porpoises currently enter San Francisco Bay year‐round, evidence suggests a disappearance that spanned approximately 65 yr. The range of energetic costs of basal metabolism, locomotion, thermoregulation, and reproduction…
Click reception in the harbor porpoise (Phocoena phocoena): Effects of electrode and contact transducer location on the auditory brainstem response
Mulsow, Jason; Finneran, James J.; Houser, Dorian S.; Nordstrom, Chad A.; Barrett-Lennard, Lance G.; Burkard, Robert F.
The Journal of the Acoustical Society of America (2018)
Unlike terrestrial mammals that have unambiguous aerial sound transmission pathways via the outer ear and tympanum, sound reception pathways in most odontocetes are not well understood. Recent studies have used…