Guy W. Oliver

University of California, Santa Cruz | UCSC · Institute of Marine Sciences

Current understanding of the behavior of marine mammals (pinnipeds) is quite limited by the observation technology used. Surface tracking using geolocation or Argos satellite tags have shown that these mammals range much farther than previously thought. Relatively simple time/depth recorders (TDRs) have shown that they dive to depths of over 1000 m...

The MAMMARK tag is a small and capable tag developed to further understand northern elephant seals. The sensing suite consists of temperature, depth, speed, salinity, three axes of magnetic field, three axes of acceleration, and GPS. It can operate at maximum depths of 2,000 m and survive a two-ton seal smashing it upon the rocks. In general, the t...

Abstract— Understanding the behavior of marine mammals is quite limited by the observation technology used. Surface tracking using either geolocation or Argos satellite tags have shown that these mammals range much farther than previously thought. Relatively simple time/depth recorders (TDR’s) have shown dives to depths of over 1000 meters for dura...

Current understanding of the behavior of marine mammals (or pinnipeds) is quite limited by the observation technology used. Surface tracking using geolocation and Service Argos tags have shown that these mammals range much farther than previously thought. Relatively simple time/depth recorders (TDR's) have shown that they dive to depths of over 100...

Heart rates of northern elephant seals diving at sea and during apnoea on land were monitored to test whether a cardiac response to submergence is an important factor in their ability to make repetitive, long-duration dives. Seven juvenile northern elephant seals were captured at Año Nuevo, CA, instrumented and translocated to release sites around...

A new method of tracking free-ranging marine mammals has been developed which employs a Global Positioning System (GPS) receiver to accurately fix an animalUs position when it surfaces and a tri-axial magnetometer and velocity-time-depth recorder to track the animals underwater movements between surfacings in 3 dimensions. Concurrent with the devel...

A new method of tracking free ranging marine mammals has been developed which employs a Global Positioning System (GPS) receiver to accurately fix an animal's position when it surfaces and a tri axial magnetometer and velocity time depth recorder to track the animals underwater movements between surfacings in 3 dimensions. Concurrent with the devel...

The ability of a grey seal, Halichoerus grypus, to navigate a variety of obstacle courses was examined under light and dark conditions in a 6.1 m diameter tank. Four maze patterns were constructed by varying the positions of 18 vertical rods in the tank. One hundred trials were conducted, each consisting of a 2 minute light phase followed by a 2 mi...

The report categorizes the research literature on right whales according to major research topics, issues of concern to Outer Continental Shelf oil and gas development, and geographic areas. The report has an extensive cross index. Selected references are depicted on an accompanying poster.

This report categorizes the research literature on bowhead whales according to major research topics, issues of concern to Outer Continental Shelf oil and gas development, and geographic areas. The report has an extensive cross index.

The report categorizes the research literature on gray whales according to major research topics, issues of concern to Outer Continental Shelf oil and gas development, and geographic areas. The report has an extensive cross-index. Selected references are depicted on an accompanying poster.