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 



Sea oats 



North Padre 



South Padre 



Season 



Variables included 



Variables used 



R 



R 2 



Variables used 1 



R 



R 2 



1970, 72 



Soil moisture and salinity 



(x)5 



0.69 



0.48 



(x) 2 



-0.39 



0.15 







3 



0.77 



0.59 



4 



0.45 



0.19 







2 



0.77 



0.59 



3 



0.48 



0.23 







4 



0.78 



0.61 



5 



0.49 



0.24 





All variables 



5 



0.69 



0.48 



2 



-0.39 



0.15 







3 



0.77 



0.59 



7 



0.47 



0.22 







10 



0.79 



0.62 



12 



0.60 



0.36 







6 



0.88 



0.78 



11 



0.75 



0.57 



1972, 74 



Soil moisture and salinity 



(x) 3 



0.61 



0.37 



(x) 4 



0.66 



0.44 







2 



0.62 



0.39 



2 



0.69 



0.47 







5 



0.64 



0.41 



3 



0.69 



0.48 







4 

 3 



0.65 

 0.61 



0.43 

 0.37 











All variables 



4 



0.66 



0.44 







2 



0.62 



0.39 



2 



0.69 



0.47 







12 



0.65 



0.42 



11 



0.77 



0.58 







11 



0.68 



0.46 



10 



0.77 



0.60 



1970, 74 



Soil moisture and salinity 



(x) 4 



0.52 



0.27 



(x)4 



0.44 



0.19 







3 



0.66 



0.43 



2 



0.48 



0.23 







5 



0.66 



0.44 



5 



0.49 



0.24 







2 



0.66 



0.44 



3 



0.49 



0.24 





All variables 



4 



0.52 



0.27 



4 



0.44 



0.19 







3 



0.66 



0.43 



12 



0.50 



0.25 







7 



0.70 



0.49 



6 



0.55 



0.30 







11 



0.71 



0.50 



11 



0.56 



0.32 



Bitter panicum 



North I 



'adre 





South Padre 



1970, 71 



Soil moisture and salinity 



(x)2 



-0.63 



0.39 



(x)4 



-0.52 



0.27 







4 



0.90 



0.81 



5 



0.91 



0.83 







3 



0.90 



0.82 



3 



0.91 



0.83 





All variables 



2 



-0.63 



0.39 



8 



-0.85 



0.72 







4 



0.90 



0.81 



12 



0.99 



0.99 







8 



1.00 



0.99 



6 



1.00 



1.00 



1. Variable numbers correspond to those in Table 26. 



95 



