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Figure 2, --Volumes of zooplankton (ml/m?) from the 15 m site are plotted for 

 the 29 nights sampled. Stars indicate full moon nights, and circles indicate 

 new moon nights. 



Samples were preserved in 5-10% formalin immediately upon return to the surface. 

 Each sample was concentrated over a 90 m mesh sieve, resuspended in formalin 

 solution and allowed to settle in graduated centrifuge tubes until a constant 

 volume was reached (usually after 48 hr) (Porter, et al . , 1978). 



Zooplankton were collected from three reef sites at Discovery Bay, Jamaica 

 (fig. 1): a shallow site (6 m) immediately behind the reef crest to the east 

 of the Discovery Bay ship channel; a 15 m site on a broad, shallow sloping fore 

 reef plain to the east of the boat channel; and a 24 m site on this same plain 

 (see Ohlhorst, 1980, and Liddell, et al . , 1984, for site descriptions). Because 

 of the variability in abundance of zooplankton from different locations at any 

 one reef site on a single night (fig. 2), traps were placed over the same 

 permanently marked reef locations at each sampling to eliminate substrata 

 induced variation when comparing one night with the next. 



103 



