^ 



t 



Brackish Water 

 Species 



10 



15 



T 1 T" 



20 25 30 



35 



Salinity 



> 



Figure 5-39. 



The comparative distribution of marine, brackish, and fresh- 

 water species along a salinity gradient in a German estuary 

 (after Remane 1934). 



250 



200 



- 150 



E 



and Freshwater Species 



100 I— 



50 



MedH Nitrnher of Freshwater Species 



I L 



MARINE- 



-»- FRESH WATER 



Transect 



Figure 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 



