Table XVII. 

 Mean blood chloride concentration +_ S. E. in P^. aztecus 

 during the time course of salinity-temperature adaptation. 



Control Temperature 18°C Control Salinity 15 /oo 



Test Temperature 25°C 



Sampling Test Salinity - °/oo 



Interval — — — ^ 



(hour) 2 5 10 15 25 36 



298+ 1.8 298-t^ 1.8 298+ 1.8 298+ 1.8 298+ 1.8 298+ 1.8 



1 270+8.3 275+2.3 297+3.1 292+_3.4 322+5.8 358+5.5 



2 260+5.8 276+3.6 294+3.2 297+5.5 310+7.0 372+8.4 

 4 243+6.2 260+5.9 297+5.6 301+8.0 323+3.9 387+10.5 

 6 230h^18.0 253+9.8 274h^6.0 293j1^4.4 323h^ 4.9 358+^10.8 



10 217^^ 3.8 253+9.8 292+4.9 295+1.4 324+3.4 348+11.9 



16 226+8.5 232+12.4 276+5.2 292+5.6 325+4.0 374+8.6 



24 236+7.3 204+10.5 283+4.9 297+0.7 321+9.0 370+22.9 



48 236+13.4 230+ 7.0 28U 2.7 278+ 1.4 316+^ 5.2 346+33.0 



72 237+9.6 216+5.8 266+8.8 281+5.7 308+15.0 356+8.4 



96 221+6.1 228+12.6 267-t^9.6 291+^2.4 334+4.7 379+6.8 



168 231+9.3 247+3.8 287+3.0 292+5.3 329+3.4 377+5.9 



Avg 249+ 4.3 252+ 4.1 286+ 2.0 293+1.4 317+2.0 353+4.9 



B18 



