S. Ridgway

Publications286
h-index49
Citations7,400
Highly Influential Citations391
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Respiration and Deep Diving in the Bottlenose Porpoise
A bottlenose porpoise was trained to dive untethered in the open ocean and to exhale into an underwater collecting funnel before surfacing from prescribed depths down to 300 meters. The animal was… Expand
Dolphin lung collapse and intramuscular circulation during free diving: evidence from nitrogen washout.
TLDR
The bottle-nosed dolphin is not protected by lung collapse from the decompression hazards of dives to depths shallower than 70 meters, so intramuscular nitrogen tensions after a schedule of repetitive ocean dives suggest. Expand
Cetacean sleep: An unusual form of mammalian sleep
TLDR
The suggestion is made that the selection pressure necessitating the evolution of cetacean sleep was most likely the need to offset heat loss to the water from birth and throughout life. Expand
Auditory and behavioral responses of bottlenose dolphins (Tursiops truncatus) and a beluga whale (Delphinapterus leucas) to impulsive sounds resembling distant signatures of underwater explosions.
TLDR
No temporary shifts in masked-hearing thresholds (MTTSs) had been observed at the highest impulse level generated, however, disruptions of the animals' trained behaviors began to occur at exposures corresponding to 5kg at 9.3 km and 5 kg at 1.6 km. Expand
Temporary threshold shift in bottlenose dolphins (Tursiops truncatus) exposed to mid-frequency tones.
TLDR
Hearing thresholds in bottlenose dolphins are measured to suggest that a SEL of 195 dB re 1 microPa2 s is a reasonable threshold for the onset of TTS in dolphins and white whales exposed to midfrequency tones. Expand
DOLPHIN THYROID AND ADRENAL HORMONES: CIRCULATING LEVELS IN WILD AND SEMIDOMESTICATED TURSIOPS TRUNCATUS, AND INFLUENCE OF SEX, AGE, AND SEASON
TLDR
Levels of both adrenal hormones were low in semidomesticated dolphins conditioned to present voluntarily their tails for blood sampling, an approach that appears to yield specimens representative of resting values for these constituents. Expand
Can diving-induced tissue nitrogen supersaturation increase the chance of acoustically driven bubble growth in marine mammals?
TLDR
It is demonstrated that the diving behavior of cetaceans prior to an intense acoustic exposure may increase the chance of rectified diffusion, and model results suggest that low-frequency rectification diffusion models need to be advanced, and the dive behavior of marine mammals of concern needs to be investigated to identify at-risk animals. Expand
River dolphins and the larger toothed whales
4 – The Central Nervous System of the Bottlenose Dolphin
Temporary shift in masked hearing thresholds in odontocetes after exposure to single underwater impulses from a seismic watergun.
TLDR
A behavioral response paradigm was used to measure masked underwater hearing thresholds in a bottlenose dolphin and a white whale before and after exposure to single underwater impulsive sounds produced from a seismic watergun to determine if a temporary shift in masked hearing thresholds occurred. Expand
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