Most, if not all, of the 35 freeze-branded dolphins apf)eared to be resident 

 to the Matagorda-Espiritu Santo Bay area with much fluidity of group 

 membership. Overall mark/recapture population size estimates from photo- 

 identification suggested that 218 ± 71.4 (95% CI) dolphins utilized an area of 

 312 km^ in Matagorda and Espiritu Santo Bays, similar to an estimate made in 

 1981. Dolphins spent longer times at the surface and dove less often at night, 

 indicating lower activity levels at night. Observations of long-distance 

 movement between Texas bays, and an autumn increase in dolphin numbers 

 in the study area, suggested that the study aiumals were not an isolated 

 population. 



IV 



