LIST OF HGURES 



Page 



Figure 1. Map of the Port O'Connor area of Matagorda Bay 45 



Figure 2. Left and right sides of a dolphin dorsal fin (FB502) 

 showing radio package placement (a) and magnesium 

 nuts (b) 46 



Figure 3. Example triangulation for FB518 at 1045 hr, 11 August 1992, 

 from Home Base, in Port O'Coru^or, and a tracking vessel 

 at the base of the western Matagorda Ship Channel jetty 47 



Figure 4. Photographic survey effort. May 1992-June 1993 48 



Figure 5. Sightings of freeze-branded dolphins across surveys 49 



Figure 6a. Summary ranges for radio tagged dolphins FB501 and 

 FB502, from radio telemetry and sightings. May 1992- 

 June 1993, with information on age and sex 50 



Figure 6b. Summary ranges for radio tagged dolphins FB504 and 

 FB505, from radio telemetry and sightings. May 1992- 

 June 1993, with information on age and sex 51 



Figure 6c. Summary ranges for radio tagged dolphins FB514 & 

 FB515 (1), FB511 & FB522 (2), and FB518 & FB521 (3), from 

 radio telemetry and sightings. May 1992-June 1993, with 

 information on age and sex 52 



Figure?. Positions of FB518 by time of day, 15 June 1992-13 



September 1992, from radio telemetry and sightings 53 



Figure 8. Approximate noon positions for dolphin FB518, 15 June 

 1992-13 September 1992, from radio tracking and 

 sightings (two subsequent sightings on bold) 54 



Figure 9. Relative frequency histograms of dive durations during 



day (a) and night (b) 55 



Figure 10. Affiliations of all female and calf (a) and male (b) freeze- 

 branded dolphins (as measured by dolphins occurring in 

 the same group in a sighting). May 1992-June 1993 56 



IX 



