Witman, J. D. and R. A. Cooper. 1983. Disturbance and 



contrasting patterns of population structure in the 

 brachiopod Terebratulina septenstrionalis ( Couthouy ) from 

 two subtidal habitats. J. Exp. Mar. Biol. Ecol . 73:57-79. 



Witman, J. D. 1985. Refuges, biological disturbance, and rocky 

 subtidal community structure in New England. Ecol. Monogr. 

 55:421-445. 



Witman, J. D. 1987. Subtidal coexistence: Storms, grazing, 

 mutualism and the zonation of kelps and mussels. Ecol. 

 Monogr. 57:167-187. 



Witman, J. D. and K. P. Sebens. In press. Distribution and 



ecology of sponges at a subtidal rock ledge in the central 

 Gulf of Maine. Proc. Third Int. Conf. Biol, of Sponges. 



Witman, J. D. and K. P. Sebens. In preparation. Fish predation 

 pressure at subtidal rock ledges in the Gulf of Maine: 

 Onshore-offshore differences. 



Yentsch, C. S. and N. Garfield. 1981. Principal areas of 



vertical mixing in the waters of the Gulf of Maine with 

 reference to total productivity of the area. Pages 303-312. 

 In: J.F.R. Gower, (ed.), Oceanography from Space. Plenum 

 Press, New York. 



Young, C. M. and F. S. Chia. 1984. Microhabitat associated 

 variability in survival and growth of subtidal solitary 

 ascidians during the first 21 days after settlement. Mar. 

 Biol. 81:61-68. 



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