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420 results on '"Ridgway, Sam H."'

103. The Cetacean Central Nervous System

Author

SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA, Ridgway, Sam H., SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA, and Ridgway, Sam H.

Abstract

Whales, dolphins, and porpoises, 78 species of entirely aquatic mammals, comprise the order Cetacea whose distant ancestors, according to paleontologists, left land in the early Eocene about 55 to 60 million years ago. The odontoceti (toothed whales, presently 67 species) and the Mysticeti, II species of baleen whales, have evolved separately since at least the late Eocene. Modern cetaceans are diverse; the largest blue whale is some 60,000 times heavier than the smallest newborn porpoise. Average adult size among cetaceans varies by at least 1000 times. Small and large species occupy all oceans from the equator to the polar seas, some forms also inhabit rivers, and four species live only in fresh water.

Published
1999

110. Behavioral Responses and Temporary Shift in Masked Hearing Threshold of Bottlenose Dolphins, Tursiops truncatus, to 1-second Tones of 141 to 201 dB re 1 Micron Pa.

Author

NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA, Ridgway, Sam H., Carter, Donald A., Smith, Robert R., Kamolnick, Tricia, Schlundt, Carolyn E., NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA, Ridgway, Sam H., Carter, Donald A., Smith, Robert R., Kamolnick, Tricia, and Schlundt, Carolyn E.

Abstract

The Navy is concerned that acoustic energy emissions from various products may interfere with marine mammals. Proposed federal regulations under the Marine Mammal Protection Act discuss temporary threshold shift (TTS) as a means of evaluating impacts of those emissions. Existing Navy methods published in the Journal of the Acoustical Society of America were applied to investigate TTS in the hearing sensitivity of bottlenose dolphins (Tursiops truncatus). Changes in the dolphins' behavior were observed. These data provide a scientific basis for decisions concerning acoustic effects on marine mammals for use in preparation of environmental plans and mitigation strategies.

Published
1997

118. Final Report from the Right Whale Necropsy Assessment Team. Results, Analysis, and Recommendations.

Author

NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA, Ridgway, Sam H., NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA, and Ridgway, Sam H.

Abstract

As many as six endangered right whales, Eubalaena glacialis, out of a western north Atlantic population estimated to number only about 300, were reported and/or found dead in their southern breeding range in the Atlantic Ocean along Georgia and Florida coasts during January and February 1996. There was suspicion by the press, public, and whale biologists studying the species that the deaths were linked to U.S. Navy operations. In view of concern within and outside the Government, the Chief of Naval Operations requested an evaluation of the four available necropsy reports. On 19 April 1996, a panel of scientific experts was convened in Washington, DC, at the Armed Forces Institute of Pathology (AFIP). This document presents results, analysis, and recommendations of the panel. After analyzing the four avallable reports, viewing videotapes, and listening to the descriptions of the necropsy surgeons, the panel concluded that the cause of death could not be conclusively determined in three of the four cases. One animal had suffered massive, acute trauma, probably inflicted by a large moving, unidentified vessel. It was generally agreed that the protocol followed for such mortalities in the future is critical to ensure that better material will be available for evaluation.

Published
1996

146. DIAGNOSIS AND SUCCESSFUL TREATMENT OF A LUNG ABSCESS ASSOCIATEDWITH BRUCELLA SPECIES INFECTION IN A BOTTLENOSE DOLPHIN (TURSIOPS TRUNCATUS).

Author

Cassle, Stephen E., Jensen, Eric D., Smith, Cynthia R., Meegan, Jennifer M., Johnson, Shawn P., Lutmerding, Betsy, Ridgway, Sam H., and Francis-Floyd, Ruth

Abstract

The article presents a case study of diagnosis and treatment of a lung abscess associated with Brucella species infection in a 27-year-old bottlenose dolphin (Tursiops truncatus). It states that brucellosis is associated with reproductive abnormalities and abortions in wild and managed populations of dolphin. It mentions that the dolphin was partially anorexic and reluctant to perform normal behaviors and its respiratory rate was decreased with minimal exertions on exhalation. The blood sample of animal was tested for any abnormalities and the animal was undergone a pulmonary ultrasound which revealed the presence of hypoechoic lesion in the left lung deep to the intercostal space.

Published
2013
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148. The blue whale brain misrepresented by an alcohol dehydrated brain of 3,636 grams.

Author

Ridgway, Sam H. and Van Alstyne, Kaitlin R.

Subjects
BRAIN, BLUE whale, SHARKS, CETACEA, BIOLOGICAL classification
Abstract

The article focuses on the reported erroneous value about the brain of the blue whale, Balaenoptera musculus. Topics include difficulties associated with extracting and measuring large brains, an increase in behavioral complexity with an increase in brain size including sharks and primates, and citations of brain size is in different studies on cetacean anatomy, evolution, ecology, taxonomy, and social organization.

Published
2017
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