Lavaniegos: Vertical distribution of euphausiid life stages 



31 I 



1979). In one station in the Costa Rica Dome (9°N, 

 89.5°W), only N. gracilis and Stylocheiron spp. were 

 found in water with oxygen below 0.1 mL/L (Sameoto 

 et al., 1987). Off both coasts of central Baja Califor- 

 nia, the depletion of oxygen is not so strong as in the 

 ETP and therefore it is not restrictive for vertical 

 ranging of the dominant temperate species (N. sim- 

 plex and N. difficilis). The relation between the ther- 

 mocline and vertical migration was more important. 



Acknowledgments 



Thanks are given to E. Brinton who reviewed the 

 manuscript and provided critical comments. Samples 

 from the Zigpac II and El Golfo II cruises were col- 

 lected by A. Fleminger and supplied by the Scripps 

 Institution's plankton collections. Support for this 

 research was provided by the scholarship program 

 at the Consejo Nacional de Ciencia y Tecnologia. 



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