Results 171 to 180 of about 2,545 (207)

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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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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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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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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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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Beluga whale ecology: a concern of freshwater biologists?

Freshwater Biology, 1988
SUMMARY.1. Churchill estuary beluga whales displayed their highest densities in freshwater habitat, suggesting preferential use.2. Whale densities in freshwater were as high as 350 animals km−2and represented over one tenth of the estimated Hudson Bay population.3.
P. D. WATTS, B. A. DRAPER
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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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Exam Suggestion System Using Beluga Whale Optimization

Concurrency and Computation: Practice and Experience
ABSTRACTIn this study, an exam recommendation system was developed using the Beluga Whale Optimization (BWO) algorithm. The system generates balanced exams by selecting the most appropriate questions from a question bank consisting of approximately 12,285 questions according to difficulty, distinctiveness, and frequency of use in previous exams.
Samet Diri, Selçuk Ögütcü, Remzi Gürfidan, Bekir Aksoy   +3 more
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Measurement of Lombard-like response in the beluga whale

The Journal of the Acoustical Society of America, 2004
Noise pollution has become recognized as a potential danger to marine mammals in general, and to the St. Lawrence beluga (Delphinapterus leucas) in particular. One method to determine whether noise is having an effect on an animals auditory ability is to observe a natural and repeatable response of the auditory and vocal systems to varying noise levels.
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Beluga whale optimization: A novel nature-inspired metaheuristic algorithm

Knowledge-Based Systems, 2022
Changting Zhong, Zeng Meng
exaly