FISHERY BULLETIN: VOL. 87. NO. 3, 1989 



Table 1. — Comparisons between study sites — means (and standard 

 deviations) of environmental characteristics at Sites 1 and 2. n is number 

 of observations. Integrations are to 50 m depth. 



Sitel 



Site 2 



gives means and variations among environ- 

 mental parameters of energy input and dissipa- 

 tion, responses of the plankton communities, and 

 levels of food supply and predation pressure to 

 which the larvae were exposed. Analyses of vari- 

 ance of environmental characteristics demon- 

 strated much smaller variations between drift- 

 ers within sites than between sites. 



In review, changes over study periods at both 



sites were local, not advective; we resampled the 

 same water and larval population within sites. 

 Vertical gradients were shoaler and more in- 

 tense at Site 1. Temperature and sahnity rela- 

 tions in the upper 100 m indicate different recent 

 histories of the waters at the two sites. Surface 

 layers at Site 1 were warmer, more saline, less 

 turbulent, less transparent, and contained 

 higher concentrations of larval foods and other 



680 



