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Vertical distributions of marlne particle-grazers and then food were measured to examine whether the vertical d~stnbution of food quallty was distinct from that of food quantity In a related paper (Napp et a1 1988) we examine the vertlcal distnbution of part~cle-grazers in relation to the d~stributlons of food quality and food quanbty Dunng an Apnl cruise In the Southern Callfornla Bight there were no differences in the size spectra of food particles between the plant b~omass maxlmum and the reglon of lower food quantity above it The specles assemblage of microplankton near the surface was more pred~ctable than that at the mlcroplankton blomass maxlmum, and was distlnct from it Species known to be noxlous or distasteful to copepods were not members of either assemblage The seston at both surface and depth contalned unequal proportions ot carbohydrate, protein, and hpid Particulate nltrogen (and proteln) per unit carbon was highest at the microplankton blon~ass maxlmum, partlculate carbohydrate per unit carbon was highest near the surface Our data provided no obvious reason why particle-grazers m ~ g h t benefit from iesiding and feedlng outslde the mlcroplankton biomass mammum

Vertical distribution of marine particles and grazers. I. Vertical distribution of food quality and quantity