Estuaries 



29 



Table I 

 Redeke's (1922) Groups of Brackish- Water 



Oligohalinophil Mesohalinophil 



Coccinodiscus rothi Coccinodiscus biconicus 



Thalassiosira baltica Thalassiosira baltica 

 Chaetoceras subtile 

 Eurytemora hirudinoides 

 Acartia bifolosa 

 Gammarus locusta 

 Corophhim lacustre 

 Corophium grossipes 



batdvd 

 Chaetoceras mulleri 

 Eurytemora ajfinis 

 Gammarus pulex 



Animals; Holland 



Polyhalinophil 

 Coccinodiscus gram 

 Thalassiosira excentri- 



ca 

 Chaetoceras debile 

 Eurytemora hirudo 

 Acartia discaudata 

 Gammarus locusta 

 Corophium lacustre 



At the mouth of the Elbe River, Schlienz (1923) studied the 

 distribution of 21 species of crustaceans between Hamburg and 

 Cruxhaven, where salinities ranged from 0.47 to 17.12. His list 

 included 1 crab, 1 shrimp, 3 schizopods, 10 amphipods, and 6 iso- 

 pods. All these except one isopod (Asellus, which was only found 

 in fresh water) , occurred at the mouth of the river and gradually 

 disappeared upstream. Only one species, Gammarus locusta cam- 

 pylops G. O. Sars, ranged throughout the region. Schlienz num- 

 bered his stations from the mouth upstream, 1 to 26. The ranges of 

 the species were as follows: 



Species Stations Lowest Salinity 



Crago vulgaris (Fabricius) 1-13 0.43 



Carcinas maenas Fabricius 1-8 6.82 



Neomysis vulgaris Thompson 1-23 0.37 



Praunus ftexuosus Miiller 1-5 13.50 



Macropsis slabberi (V. Beneden) 1-4 13.97 



Corophium curvisi)inum. devium 



G. O. Sars, Wundsch 20-26 0.0-0.5 



Gammarus locusta campylops 



G. O. Sars 1-26 0.37 



Corophium lacustre Vanh. 8-14 0.37 



Gammarus duebenii Liljeborg . 1-10 4.40 



