Results 221 to 230 of about 7,970 (263)

Masked tonal hearing thresholds in the beluga whale

The Journal of the Acoustical Society of America, 1989
Masked tonal thresholds were measured for a beluga whale at one noise level and 32 frequencies between 40 Hz and 115 kHz. Critical ratios were estimated and compared with those previously measured for the bottlenose dolphin. Beluga whale critical ratios were found to be about 3 dB lower than those of the bottlenose dolphin.
C S, Johnson, M W, McManus, D, Skaar
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Demonstration of adaptation in beluga whale echolocation signals

The Journal of the Acoustical Society of America, 1985
The echolocation signals of the same beluga whale (Delphinapterus leucas) were measured first in San Diego Bay, and later in Kaneohe Bay, Oahu, Hawaii. The ambient noise level in Kaneohe Bay is typically 12 – 17 dB greater than in San Diego Bay. The whale demonstrated the adaptiveness of its biosonar by shifting to higher frequencies and intensities ...
W W, Au, D A, Carder, R H, Penner, B L, Scronce   +3 more
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Acoustic Signature of the Beluga Whale

The Journal of the Acoustical Society of America, 1974
Acoustic signatures have been acquired from a pod of Beluga (Delphinapt-Erus Leucas) whales. These whales were swimming unmolested on the surface in the lead ∼1000×200 yd in the north Bering Sea. The acoustic data were acquired with a sensitive noise system ( — 84 dB) in a region free of man-made noise.
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Bone Fluoride Concentrations in Beluga Whales from Canada

Journal of Wildlife Diseases, 1999
Beluga whales (Delphinapterus leucas) from the St. Lawrence Estuary have been reported to have dental and bone abnormalities. To determine whether these lesions could be caused by high exposure to fluorides, we measured bone fluoride levels in eight beluga whales stranded on the shores of the St.
I, Mikaelian, C W, Qualls, S, De Guise, M W, Whaley, D, Martineau   +4 more
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Frequency Tuning of Hearing in the Beluga Whale

2016
Data on frequency tuning in odontocetes are contradictory: different authors have reported filter qualities from 2 to almost 50. In this study, frequency tuning was measured in a beluga whale (Delphinapterus leucas) using a rippled-noise test stimulus in conjunction with the auditory evoked potential (AEP) technique.
Evgeniya V, Sysueva, Dmitry I, Nechaev, Vladimir V, Popov, Alexander Y, Supin   +3 more
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Whale tear glands in the bowhead and the beluga whales: Source and function

Journal of Morphology, 2020
AbstractOrbital glands are found in many tetrapod vertebrates, and are usually separate structures, consisting of individual glands lying in the eyelids and both canthi of the orbit. In cetaceans, however, the orbital glandular units are less distinct and have been described by numerous authors as a single, periorbital mass. There are few histochemical
Susan J. Rehorek, Rapahela Stimmelmayr, John C. George, Robert Suydam, Denise M. McBurney, JGM Thewissen   +5 more
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The spiral ganglion and Rosenthal's canal in beluga whales

Journal of Morphology, 2015
ABSTRACTWith the increase of human activity and corresponding increase in anthropogenic sounds in marine waters of the Arctic, it is necessary to understand its effect on the hearing of marine wildlife. We have conducted a baseline study on the spiral ganglion and Rosenthal's canal of the cochlea in beluga whales (Delphinapterus leucas) as an initial ...
Jennifer D, Sensor, Robert, Suydam, John C, George, M C, Liberman, Denise, Lovano, Mary Ann, Rhaganti, Sharon, Usip, Christopher J, Vinyard, J G M, Thewissen   +8 more
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Phenotyping of beluga whale blood lymphocytes using monoclonal antibodies

Developmental & Comparative Immunology, 1997
Widespread efforts are currently made to classify morphologically indistinguishable lymphocyte subpopulations in several species. In order to increase the knowledge in cetacean immunology, cross-reactivity of antibodies against bovine, human, ovine and mouse cell surface proteins was tested on beluga whale (Delphinapterus leucas) peripheral blood ...
S, De Guise, J, Bernier, D, Martineau, P, Béland, M, Fournier   +4 more
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Uterine Adenocarcinoma with Abdominal Carcinomatosis in a Beluga Whale

Journal of Wildlife Diseases, 1998
A case of uterine adenocarcinoma is reported in a 26-yr-old, free-ranging beluga whale (Delphinapterus leucas) from the St. Lawrence estuary (Quebec, Canada). This neoplasm appeared as a segmental stenotic thickening of the left uterine horn composed of well differentiated, but disorganized and infiltrative, glandular structures surrounded by an ...
S, Lair, S, De Guise, D, Martineau
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Regional variability in Mackenzie Inuit beluga whale use

International Journal of Osteoarchaeology, 2002
AbstractInuit of the Mackenzie Delta region, Northwest Territories, relied on a wide range of subsistence resources, however they are best known as the consummate hunters of beluga whales (Delphinapterus leucas). This species represented a focal resource for the two regional groups centred on the East Channel of the Mackenzie River, but was available ...
T. Max Friesen, David Morrison
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