Publications by authors named "Timothy M Cameron"
Article Synopsis
- - The continental slope and abyss are Earth's largest habitats, yet there is a surprising lack of documented fish sounds from deep waters, although some fish likely use sound in mating rituals.
- - This study examines the acoustic behavior of bubbles as a model for understanding fish sound production and sonar characteristics, especially considering the effects of deep-water environmental extremes.
- - Results indicate that bubbles radiate sound less efficiently at greater depths, with a significant reduction in sound power (25 dB) at 3500 meters, which may explain the scarcity of recorded fish sounds in these deep environments.
Despite rapid damping, fish swimbladders have been modelled as underwater resonant bubbles. Recent data suggest that swimbladders of sound-producing fishes use a forced rather than a resonant response to produce sound. The reason for this discrepancy has not been formally addressed, and we demonstrate, for the first time, that the structure of the swimbladder wall will affect vibratory behaviour.
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- Male parasitic wasps like Cotesia congregata use a courtship song made up of distinct components: a long "buzz" followed by pulsating "boings."
- High-speed videography and audio recordings were utilized to analyze how these sounds are produced, revealing that the boings have higher amplitude and lower frequency due to greater wing displacement, and sound is not generated by wing contact.
- The study concludes that the unique sound production mechanism involves the acceleration of wing tips during the wing's downstroke, and the findings suggest that small insects are well-suited for generating sounds due to their high wing flap rates.
Both the swimbladder and sonic muscles of the oyster toadfish Opsanus tau (Linnaeus) increase in size with fish growth making it difficult to distinguish their relative contributions to sound production. We examined acoustics of the swimbladder independent of the sonic muscles by striking it with a piezoelectric impact hammer. Amplitude and timing characteristics of bladder sound and displacement were compared for strikes of different amplitudes.
View Article and Find Full Text PDFRecent reports of high frequency sound production by cusk-eels cannot be explained adequately by known mechanisms, i.e., a forced response driven by fast sonic muscles on the swimbladder.
View Article and Find Full Text PDFPhysiological work on fish sound production may require exposure of the swimbladder to air, which will change its loading (radiation mass and resistance) and could affect parameters of emitted sounds. This issue was examined in Atlantic croaker Micropogonius chromis by recording sounds from the same individuals in air and water. Although sonograms appear relatively similar in both cases, pulse duration is longer because of decreased damping, and sharpness of tuning (Q factor) is higher in water.
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