Ninety-five percent confidence intervals were calculated from Seber 

 (1982): 



N ± 1.96Vv 

 where the Bailey-modified variance, v, is 



V = 



\f\n-¥l)in-m) 

 (m + l)^(m + 2) 



We utilized information from the radio-tracking study to approximate a 

 dosed population, and thus minimize incorrect assumptions in the 

 population estimates. Because survey effort was consistent for only a small 

 portion of the total study area (the region surveyed six times in Fig. 4), 

 population size estimates were based only on resightings from this 13 km^ 

 area. The number of dolphins estimated to utilize this area was then assumed 

 to occupy at least the areas of Matagorda and Espiritu Santo bays which lie 

 within the ranges of the 10 radio-tracked dolphins. Further refinements were 

 made by determining the total number marked, M, to be not 35, but 17: 

 sightings of the five calves were not independent of their mothers (except one 

 sighting in June 1993), and 13 freeze-branded dolphins were considered to be 

 non-residents in the radio-tracked ranges, based on photo-identification 

 results. 



Slides of biopsy wounds were examined when projected on a screen, or 

 viewed on a light table with a 8x loupe. Observations were made on the size, 

 shape, and coloration of the wounds, and compared over time. Calif>er 

 measurements were made on aspects of the wounds, from projected images. 

 These relative measurements were then scaled to measurements of dorsal fin 

 features, the size of which were known from photographs displaying a 

 measurement scale several cm behind the fin, taken during dolphin capture. 

 Biopsy wounds were occasionally compared with same-animal radio-tag and 

 roto-tag wounds. Because the photogrammetric measurements may be 

 inaccurate by several nron, due to photographic perspective and variation 

 among individuals, caution should be used in comparison of the 

 measurements. 



For the 36 captured dolphins, the numbers of notches on the posterior 

 edge of each dorsal fin were counted and compared by sex (Mann-Whitney 

 U), age, and (for non-calves seen ^ 5 times) number of affiliates (simple linear 

 regression). Dorsal fin photographs were taken while the captured dolphins 

 were held for health evaluation. The numbers of notches were counted by 

 viewdng these slides with a 8x loupe. Or\ly notches which we believed were 



