Appendix Figure A7. — A saddleback dolphin wearing a radio tag 

 transmitter surfaces to breathe oH southern California. {Photo courtesy 

 ofW. E. Evam.) 



provide important information on movement, activity 

 patterns, and respiration rates. 



Subsequent developments have involved the addition of 

 sensors to monitor the maximum depth of each dive and 

 environmental parameters such as the water temperature at 

 that depth (Fig. A8). 



Logical extensions of these developments include the 

 addition of numerous other sensors to permit simultaneous 

 monitoring of multiple aspects of the animal's environment 

 and the transmission of these data first to aircraft and 

 subsequently to satellites for relay to shore-based 

 laboratories. 



In addition to permitting scientists to define movement 

 patterns and daily diving patterns of cetaceans, the use of 

 such devices offers an exciting means of determining the 

 environmental parameters that trigger changes in their 

 behavior. 



Radio transmitter tags, in a variety of configurations, 

 may be constructed and attached for short-term studies or for 

 long-term monitoring of migrating animals. In either case, 

 depending on their size and methods of attachment, radio 



Appendix Figure A8. — A radio transmitter package attached to the dorsal ridge of a California gray whale. This yearling animal, captive for most of the 

 first year of its life, was released into the ocean off San Diego, Calif., in March 1972 and subsequently tracked from shipboard and aircraft for over 30 days. 

 The sensor transmitter package, shown in detail in the inset, was designed to measure the maximum depth of the animal's dive and the water temperature 

 at that depth. (Photo by S. Leatherwood.) 



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