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



New England salt marsh showing intertidal high and 



low marsh (adapted from >liller 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 



7-3 Lake zonation based on biological function. 



Example given is a moderately deep oligomesotrophic 



Maine lake 7-14 



7-4 Factors and interactions that determine lake 



characteristics (modified from Rawson 1939 by Cole 1975) . . 7-15 



7-5 Idealized energy flow diagram for the pelagic 



portion of a large, deep lake 7-27 



XV 



10-80 



