Table 6. Effects of competition with pickleweed ( Salicornia virginica ) and 

 other succulents on the abundance of cordgrass ( Spartina foliosa ) at Tijuana 

 Estuary. 



1981 Sampling Date 

 27 Feb 6 July 5 Oct 



Soil salinity in ppt: x (s.E.) 



37 (0.5) 46 (0.5) ^^ (2.n) 

 31 _ 53 



Spartina density 



2 

 number per m 



^ 



(■Sv 



65 



-Sv 



152 



Live biomass of Spartina 



2 



g dry weight/m 



56' 



+Sv 



-Sv 



240 



417 



+Sv quadrats were^ unaltered until 5 Oct; -Sv quadrats had all plants (ave. = 

 1,085 g dry wt/m ) except Spartina foliosa removed on 27 Feb. Resprouts of 

 other species were removed 3 times, and their total dry weight (ave. = 216 

 g/m ) indicates that nutrient competition was not completely eliminated. 

 However, shading effects were removed, and the response of Spartina foliosa 

 was pr6"bably due to increased light as well as some nutrient release. 



Live biomass at the start was determined from quadrats where all vegetation 

 was removed. 

 •Significantly different (p<0.05). 



23 



