Browsing by Author "Nelson, Donald R."

Now showing items 1-3 of 3

A Telemetric Study of the Behavior of Free-Swimming Pacific Angel Sharks, Squatina californica

Standora, Edward A.; Nelson, Donald R.

Nine Pacific angel sharks were tagged near Santa Catalina Island, California, with single-channel or multichannel ultrasonic transmitters incorporating various combinations of sensors to measure swimming speed, depth, ...
Circadian Activity Rhythm in the Horn Shark, Heterodontus francisci: Effect of Light Intensity

Finstad, William O.; Nelson, Donald R.

Activity onsets of horn sharks, Heterodontus francisci, were studied in the natural environment at Santa Catalina Island, California. The mean of activity onsets of these nocturnal sharks occurred 76 min after sunset which ...
Responses in Bahamiam Sharks and Groupers, to Low-Frequency, Pulsed Sounds

Nelson, Donald R.; Johnson, Richard H.; Waldrop, Larry G.

Responses to low-frequency (50-200 Hz), pulsed sounds were observed in reef sharks (Ginglymostoma cirratum, Sphyrna tiburo), pelagic sharks (Carcharhiniis falciformis), and in several species of groupers (Mycteroperca ...