Table XLI. 

 Mean blood magnesium concentration + S. E. in P. aztecus 

 during the time course of salinity-temperature adaptation. 



Control Temperature 32°C Control Salinity 15 /oo 



Test Temperature 25°C 



Sampling Test Salinity - °/oo 



Interval 



(hour) 2 5 10 15 25 36 



5.5+0.2 5.5+^0.2 5.5+0.2 5 . 5 +_0 . 2 5.5^^ 0.2 5.5jt_0.2 



1 7.2+1.5 7.U0.5 8.3+^0.4 8.7+_0.7 16.1ji^0.9 12.2+0.3 



2 10.7+^0.9 7.1 + 0.7 6.7+^0.6 5.5+^0.7 17.4ji^ 0.8 16.4+0.8 

 4 6.5+^1.2 6.2 + 0.3 6.U0.3 5.3+^0.5 23.6jt^ 3.6 19.3-+1.6 

 6 8.3+^0.4 5.3+^0.3 7.1+^0.4 5.4+^0.4 20. U 2.8 16.3+1.0 



10 6.8+^0.4 5.8+^0.3 6.3+0.5 5.1+_0.7 25.3j|^4.7 14.2_+0.9 



16 2.9+^0.4 6.2+^0.5 7.1 + 0.3 8.7+_0.4 21.8-t^3.0 16.7+2.1 



24 4.0+0.3 4.6+^0.4 6.3+^0.8 6.3^^1.2 20.6h^ 1.7 22.0+^1.8 



48 3.6+0.0 4.2+^0.2 6.3+0.3 8.1+0.8 26.4+2.6 19.2-t^3.8 



72 3.4+^0.2 4.1+_0.7 7.1+_0.9 7.6+0.6 42.4 + 10.7 46.5+^1.7 



96 3.5+0.0 5.6+0.3 6.6+^0.3 8.5+^0.5 31.5-1^4.3 48.3+4.9 



168 3.7+^0.1 7.8-1^2.8 6.7+^0.5 5.3+^0.5 20.4j^2.5 82.1 + 7.8 



Avg 5.8+0.4 5.8+0.2 6.6+0.2 6.6+0.2 19.0+ 1.6 21.2+2.5 



B42 



