Table 2. Interaction matrix of effects of weirs on wetland ecosystem. Data from experiments 

 with inadequate control sites are not included. 



Parameter 



Higher No change 



Lower 



Source 



Water salinity 



Water oxygen 

 Turbidity 



Soils 

 Eh 

 pH 

 salinity 



organic content 



Pond siltation rate 



Vegetation coverage 

 in ponds 



in marsh 



X 



X 



Weaver 1969; Floar 1975; 

 Herke 1977 (Biloxi Marsh) 



Chabreck and Hoffpauir 

 1962 (Marsh I.); Burleigh 



1966; Larrick 1975 (sites 

 1,2,3); Olinde 1977 



Wengert 1972 (areas 1,23,4 

 combined); Herke 1977 

 (Marsh I.) 



Burleigh 1966; Hoar 1975 



Weaver 1969; Larrick 1975 

 (sites 2,3) 



Chabreck and Hoffpauir 

 1962 (Marsh I.); Larrick 

 1975 (site 1); Hoar 1975 



X 



Chabreck et al. 1979 



Larrick 1975 (sites 1,3); 

 Chabreck and Hoffpauir 

 1962 



Larrick 1975 (site 2) 



Larrick 1975 (site 3) 



Larrick 1975 (sites 1,2); 

 see Table 5 a 



(Continued) 

 155 



