732 



VERNBERG 



49.0 



42.0 



35.0 



> 



< 



CO 



28.0 



21.0 — 



14.0 — 



49.0 — 



42.0 — 



35.0 — 



I- 



z 28.0 



< 



to 



21.0 — 



14.0 



7.0 14.0 21.0 28.0 



TEMPERATURE, 'C 



(a) 



35.0 



42.0 



14.0 21.0 28.0 



TEMPERATURE, 'C 



( b) 



Fig. 4 Estimation of percentage mortality of first-stage Uca 

 pugilator zoea based on response surface fitted to observed mortality 

 under 13 combinations of salinity and temperature (a) with and 

 (b) without the addition of 1 ppb cadmium. (From W. B. Vernberg, 

 P. J, DeCoursey, and J. O. O'Hara, Multiple Environment Factor 

 Effects on Physiology and Behavior of the Fiddler Crab, Uca 

 pugilator, in Pollution and Physiology and Mariiie Organisms, pp. 

 381-425, Academic Press, Inc., New York, 1974, 



