460 



Fishery Bulletin 92(2), 1994 



SPOTTED DOLPHIN 



ar-May 1983 

 s -7 ^ — 



-160 -150 -140 -130 -120 -110 -100 -90 -80 -70 



ep-Nov 1985 



Figure 6A 



Spotted dolphin (Stenella attenuata) habitat quality (H) calculated for 

 extreme seasons: March-May 1983 and September-November 1985. 



Acknowledgments 



We thank the dedicated tuna vessel and research 

 vessel observers, oceanographic technicians, and 

 cooperative ship personnel who contributed to the 



collection of the sighting and environmental data. 

 Robert Holland assisted in manipulating the large 

 data sets for this study. Doug DeMaster provided 

 continual support and encouragement. 



Literature cited 



Anganuzzi, A. A., and S. T. Buckland. 



1989. Reducing bias in trends in dolphin relative 

 abundance, estimated from tuna vessel data. 

 Rep. Int. Whal. Comm. 39:323-334. 

 Buckland, S. T., K. L. Cattanach, and A. A. 

 Anganuzzi. 



1992. Estimating trends in abundance of dolphins 



associated with tuna in the eastern tropical Pacific 

 Ocean, using sightings data collected on commer- 

 cial tuna vessels. Fish. Bull. 90:1-12. 

 Fiedler, P. C. 



1992. Seasonal climatologies and variability of 

 eastern tropical Pacific surface waters. Dep. 

 Commer., NO AA Tech. Rep. NMFS 109, 65 p. 

 Hollowed, A. B., K. M. Bailey, and W. S. Wooster. 

 1987. Patterns in recruitment of marine fishes in 



