Th 

 where 

 theore 

 popul a 

 water 

 subseq 

 aj_. , 1 

 shelf- 

 parti c 

 growth 

 pul sed 

 has st 

 other 

 reefs 

 contro 

 questi 



Di 

 nearsh 

 the mi 

 The hi 

 stable 

 surrou 

 from a 

 Ocul i n 

 of san 

 fact , 

 that t 

 resul t 

 regi on 

 upwel 1 



e ap 

 temp 

 ti ca 

 tion 

 onto 

 uent 

 978; 

 edge 

 ul at 



at 



, oc 

 ored 

 fact 

 al so 

 lied 

 on . 

 sti n 

 ore 

 d-sh 

 gh s 



the 

 ndi n 

 lgal 

 a^ re 

 d, an 

 a 13 

 he h 



of 

 . T 

 ed w 



osymb 



eratu 



lly s 



whi c 



the 



i ncr 



Paff 



Ocul 



e org 



80 m 



curri 



up t 



ors s 



coul 



envi 



ct as 

 and s 

 elf r 

 peci e 

 rmal 

 g hab 

 -spon 

 ef si 

 d tern 

 .4°C 

 igh s 

 the u 

 he sp 

 ater 



i o t i c 

 res a 

 houl d 

 h pos 

 shelf 

 eases 

 enhof 

 i na . 



am c 

 shows 

 ng du 

 he nu 

 uch a 

 d be 

 ronme 



pop 

 vera 



hav 

 sess 



edg 



of 

 er , 



The 

 mate 



a p 

 ri ng 

 trit 

 s gr 

 impo 

 ntal 



ulations of Ocul i na at the shelf-edge reefs, 

 ge 8.4°C cooler than the nearshore reefs, 

 e lower growth rates than the shallow 

 es zooxanthel 1 ae . Upwelling of nutrient rich 

 e of the study area (Gibson, pers. comm.) and 

 phytopl ankton and zoopl ankton (Atkinson, ejt 

 1980) may enhance growth rates of the 



shelf-edge coral must rely on dissolved and 

 rial and plankton for nutrition. Even though 

 ositive response to temperature, growth may be 



warmer non-upwel 1 i ng periods after the coral 

 ion gained during the upwelling. Of course 

 eater sedimentation rates on the nearshore 

 rtant. Short term growth studies under 



conditions are necessary to resolve this 



semb 

 helf 

 eef s 



s ri 

 envi 

 i tat 



ge, 



te, 



pera 



vari 



peci 



pwel 



eci f 



to t 



1 ages 

 -edge 



and 

 chnes 

 ronme 



hete 

 rock , 

 howev 

 ture 

 ati on 

 es di 

 1 ing 

 i c pa 

 he co 



of bot 



reefs . 

 d i v e r s i 

 s at th 

 nt. Al 

 rogenei 



and sa 

 er , is 

 f 1 uctua 



was re 

 versi ty 

 which i 

 thways 

 ral and 



h de 

 Th 

 ty i 

 e ne 

 so t 



ty; 

 bell 

 an i 

 tion 

 cord 



on 

 nduc 

 of e 



f au 



capods a 

 ese two 

 s greate 

 arshore 

 he nears 

 thus, th 

 a r i i d wo 

 sol ated 

 s from u 

 ed wi thi 

 the shel 

 es incre 

 nergy tr 

 nal comm 



nd mo 

 reefs 

 st at 

 reef 

 hore 

 e spe 

 rm re 

 pinna 

 pwel 1 

 n a 2 

 f-edg 

 ased 

 ansf e 

 u n i t i 



1 1 usks occur on the 

 have more species than 

 the shel f-edge reef, 

 may be due to a more 

 reef has greater 

 cies pool may be drawn 

 ef biotopes. The 80 m 

 cle surrounded by miles 

 ing are extreme; in 

 4 h period. I suggest 

 e Ocul i na reefs is a 

 producti vi ty of that 

 r from the nutrients of 

 es remain unknown. 



ACKNOWLEDGEMENTS 



R.M. Avent is gratefully acknowledged for initiating these studies 

 on Ocul i na . H.L. Edmiston did much of the research on the morphology 

 of the Ocul ina corallum. P.M. Mikkelsen assisted with the molluscan 

 research. CM. Hoskin, R.W. Virnstein, and K.J. Eckelbarger are 

 thanked for their critical reviews of the manuscript. This is 

 Contribution No. 355 from Harbor Branch Foundation, Inc. 



LITERATURE CITED 



Andrews, J.C., & P. Gentien. 1982. Upwelling as a source of nutrients 



for the Great Barrier Reef ecosystem: a solution to Darwin's 



question? Mar. Ecol . Prog. Ser. 8:257-269. 

 Atkinson, L.P., G.A. Paf f enhbf er , & W.M. Dustan. 1978. The chemical 



and biological effect of a Gulf Stream intrusion off St. 



Augustine, Florida. Bull. Mar. Sci. 28:667-679. 

 Atkinson, L.P., & T.E. Targett. 1983. Upwelling along the 60-m 



isobath from Cape Canaveral to Cape Hatteras and its relationship 



to fish distribution. Deep-Sea Res. 30:221-226. 

 Avent, R.M., M.E. King, & R.H. Gore. 1977. Topographic and faunal 



studies of shelf-edge prominences off the central eastern Florida 



coast. Int. Revue ges. Hydrobiol. 62:185-208. 



123 



