Results 181 to 190 of about 6,438 (222)

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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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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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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Delphinapterus leuca (Beluga whale)

1977
The karyotypes were donated by Dr. Deborah A. Duffield and come from lymphocyte cultures. The female karyotype is C-banded. The last pair of autosomes has distinct satellite with heteromorphic C-band.
T. C. Hsu, Kurt Benirschke
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Unsupervised classification of beluga whale vocalizations

The Journal of the Acoustical Society of America, 2005
Unsupervised classification techniques are designed to discover natural groupings in a collection of data. For instance, unsupervised classification methods can be used to help define a repertoire for a species by grouping similar vocalizations together. The vocalizations grouped together are then defined as a single call type in the repertoire.
Patrick J. Clemins, Michael T. Johnson
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A beluga whale socialized with bottlenose dolphins imitates their whistles

Animal Cognition, 2017
The research on imitation in the animal kingdom has more than a century-long history. A specific kind of imitation, auditory-vocal imitation, is well known in birds, especially among songbirds and parrots, but data for mammals are limited to elephants, marine mammals, and humans.
Elena M. Panova, Alexandr V. Agafonov
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Microsatellites from the beluga whaleDelphinapterus leucas

Molecular Ecology, 1996
AbstractFifteen microsatellites were isolated from a beluga whaleDelphinapterus leucas, genomic library. The microsatellites were amplified in 100 beluga obtained from two widely separated locations. An average of 8.6 alleles per locus were detected and the average heterozygosity was 0.65 with a range of 0.27–0.86.
F C, Buchanan, M K, Friesen, R P, Littlejohn, J W, Clayton   +3 more
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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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Anatomy of the heart of the beluga whale (Delphinapterus leucas)

Journal of Morphology, 1987
AbstractThe heart of the beluga whale (Delphinapterus leucas) is described from the dissection of seven specimens. As in most whales the heart is characterized by a transverse broadness and a flatness of the ventricles from one surface to the other and by an apex formed by both ventricles.
A, Bisaillon, D, Martineau, M A, St-Pierre   +2 more
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Detection of Tone Glides by the Beluga Whale

1992
Bullock et al. (1962), working with four species of delphinids, found that frequency-modulated (FM) pulses of 2–5 msec duration sometimes produced large electrophysiological responses compared to continuous frequency (CF) pulses in the same frequency range.
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