Table 27. Multiple correlation coefficients (R) and coefficients of determination (R 2 ) relating 



environmental and plant parameters to survival of test species on Padre Island.— Continued 



Bitter panicum 



North Padre 



South Padre 



Season 



Variables included 



Variables used 



R 



R 2 



Variables used 



R 



R 2 



1971,72 



Soil moisture and salinity 



(x) 5 



0.46 



0.21 



(x) 3 



-0.66 



0.44 







2 



0.47 



0.22 



2 



0.77 



0.59 







4 



0.49 



0.24 



4 



0.78 



0.61 







3 



0.50 



0.25 



5 



0.84 



0.71 





All variables 



8 



-0.66 



0.44 



3 



-0.66 



0.44 







4 



0.85 



0.72 



2 



0.77 



0.59 







3 



0.96 



0.92 



10 



0.84 



0.70 







6 



1.00 



1.00 



6 



0.97 



0.94 



1972, 73 



Soil moisture and salinity 



(x) 4 



-0.64 



0.41 



(x) 4 



0.15 



0.02 







2 



0.73 



0.53 



5 



0.72 



0.53 







5 



0.75 



0.56 



2 



0.91 



0.82 







3 



0.75 



0.56 



3 



0.92 



0.84 





All variables 



4 



-0.64 



0.41 



12 



0.61 



0.38 







2 



0.73 



0.53 



6 



0.78 



0.61 







12 



0.93 



0.87 



8 



0.90 



0.80 







6 



0.97 



0.95 



5 



0.92 



0.85 



1973, 74 



Soil moisture and salinity 



(x) 5 



-0.73 



0.53 



(x) 4 



0.94 



0.88 







3 



0.79 



0.63 



5 



0.99 



0.98 







2 



0.98 



0.96 



3 



1.00 



0.99 







4 

 5 



0.98 

 -0.73 



0.97 

 0.53 











All variables 



4 



0.94 



0.88 







8 



0.91 



0.82 



5 



0.99 



0.98 







3 



0.96 



0.93 



12 



1.00 



1.00 







2 



0.99 



0.98 















1970, 72 



Soil moisture 



(x) 5 



0.75 



0.56 



(x) 5 



0.49 



0.24 







4 



0.75 



0.56 



3 



0.59 



0.35 







2 



0.76 



0.57 



4 

 2 

 5 



0.66 

 0.66 

 0.49 



0.43 

 0.43 





All variables 



6 



0.77 



0.59 



0.24 







11 



0.90 



0.80 



6 



0.62 



0.38 







12 



0.96 



0.93 



3 



0.67 



0.45 







10 



0.97 



0.94 



10 



0.82 



0.67 



1. Variable numbers correspond to those in Table 26. 



96 



