5-40 Number of marine and freshwater invertebrate 



species from the mouth to the head of the Sheepscot 



River estuary (Larsen and Doggett 1978b) 5-86 



5-41 The process of salt marsh progradation 



(adapted from Redfield 1972) 5-111 



5-42 The process of salt marsh transgression 5-111 



5-43 Salinity ranges of the bottom sediments underlying 

 the different marsh communities in New England 

 salt marshes (adapted from Chapman 1940a) 5-114 



5-44 Cross section of an upland-to-bay sequence in a 



New England salt marsh showing intertidal high and 



low marsh (adapted from Miller and Egler 1950) 5-115 



5-45 Succession of plant communities on New england 



salt marshes (adapted from Chapman 1940b) 5-120 



5-46 Monthly (June to October) density (number of shoots 

 per square meter) of cordgrass in the Causeway 

 marsh, Montsweag Bay, from 1972 to 1974 

 (Vadas et al. 1976; and Keser et al . 1978) 5-123 



5-47 Energy flow in an estuarine intertidal emergent 

 wetland, showing the relationship between the 

 terrestrial, riverine, and estuarine systems 5-129 



5-48 Protein enrichment of Spartina detrital particles 

 resulting from microbial colonization (after 

 Odum and de la Cruz 1967) 5-130 



6-1 Hierarchical classification of the riverine 



system of coastal Maine (Cowardin et al. 1979) 6-2 



6-2 Cross-section of deposits filling the tidal portion of 



the Kennebec River (adapted from Upson and Spencer 1964) . . 6-8 



6-3 Organic matter processing in upper perennial stream 



communities (adapted from Cummins and Spengler 1978) .... 6-20 



6-4 Trends in the composition of invertebrate communities 

 along an upstream-downstream gradient 

 (adapted from Marzolf 1978) 6-24 



7-1 Hierarchical classification of the lacustrine system 



of coastal Maine (Cowardin et al. 1979) 7-3 



7-2 Comparison of summer conditions of temperature, oxygen 

 and phosphate-phosphorus at different depths in 

 shallow and deep eutrophic lakes (fertile) and 

 oligotrophic lakes (infertile) 7-12 



xxv 



10-80 



