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.-Lontinued 



Bitter panicum 



North Padre 



South Padre 



Season 



Variables included 



Variables used 



R 



R 2 



Variables used 



R 



R 2 



1972, 74 



Soil moisture and salinity 



(x) 4 



-0.56 



0.32 



(x) 4 



0.30 



0.09 







2 



0.65 



0.42 



5 



0.33 



0.11 







3 



0.68 



0.47 



3 



0.35 



0.12 







5 



0.68 



0.47 



2 



0.36 



0.13 





All variables 



4 



-0.56 



0.32 



6 



0.43 



0.18 







2 



0.65 



0.42 



8 



0.63 



0.40 







11 



0.75 



0.57 



12 



0.64 



0.41 







8 



0.82 



0.66 



11 



0.71 



0.51 



1970, 74 



Soil moisture and salinity 



(x) 5 



0.30 



0.09 



(x) 3 



0.29 



0.08 







4 



0.38 



0.14 



4 



0.34 



0.12 







3 



0.44 



0.19 



5 



0.34 



0.12 







2 



0.44 



0.19 



.... 









All variables 



5 



0.30 



0.09 



6 



0.35 



0.12 







12 



0.43 



0.09 



8 



0.45 



0.20 







8 



0.48 



0.23 



3 



0.52 



0.27 







2 



0.51 



0.26 



4 



0.53 



0.29 



Shoredune panicum 



North Padre 



South Padre 



1971, 72 



Soil moisture and salinity 



(x)5 



0.82 



0.67 



(x)2 



0.60 



0.35 







3 



0.86 



0.75 



4 



0.69 



0.47 







2 



0.88 



0.77 



5 



0.91 



0.83 





All variables 



5 



0.82 



0.67 



11 



0.63 



0.40 







9 



0.94 



0.89 



5 



0.93 



0.86 







11 



0.98 



0.96 



10 



0.95 



0.90 







3 



0.99 



0.99 



9 



0.96 



0.92 



1. Variable numbers correspond to those in Table 26. 



97 



