4-17 Size distribution of organic carbon, particles in 



sea water (adapted from Sharp 1973) 4-51 



4-18 Schematic diagram of the organic matter cycle 



in the marine system 4-52 



4-19 Physical conditions of the marine water column during 



summer (stratified) and winter (well mixed) which affect 



phytoplankton growth. Arrows indicate mixing; N= nutrients; 



dots are phytoplankton (C.S. Yentsch 1977) 4-54 



4-20 Comparison of the boundaries of the physical intertidal 



and subxidal zones and the littoral (biological intertidal) 



and sublittoral (biological subtidal) zone with increasing 



exposure to wave action (adapted from Lewis 1964) 4-60 



4-21 Seasonal variation in chlorophyll-a concentrations 

 at Boothbay Harbor (A, region 2), approximately 

 8 miles south of the mouth of the Sheepscot 

 estuary (B, region 2) and near Monhegan Island 

 (C, region 3; Yentsch, unpublished ) 4-63 



4-22 Contour map of surface chlorophyll concentrations 

 off Monhegan Island (region 3) during the 1976 

 dinoflagellate bloom (Yentsch and Glover 1977) 4-64 



4-33 Relation of phytoplankton species diversity to 

 phytoplankton population size in marine and 

 estuarine waters (Hulbert 1963) 4-65 



4-24 Mean seasonal volumes of zooplankton in Gulf of 



Maine coastal areas in 1965 and 1966 (Sherman 1968) 4-69 



4-25 Mean number (by season) of dominant copepod species 

 (per 100 m3) in Gulf of Maine coastal waters in 

 1965 and 1966. W= western, C= central, and 

 E= eastern (Sherman 1968) 4-70 



4-26 Seasonal variation in percentage composition 

 of copepods and non copepods in Penobscot 

 Bay in 1974 and 1975 (Bertrand 1977) 4-71 



4-27 Schematic representation of the intertidal zonation 



patterns on exposed rocky shores in coastal Maine 4-82 



4-28 Percentage composition by taxa of invertebrates on sand 



beaches in Maine (Larsen and Doggett, in preparation ) .... 4-89 



