Photoperiod and salinity effects on survival and some blood parameters in female Bufo regularis

Abstract

This study, investigates the effect of different salinities injected (30, 70 and 100 % sea water) and photoperiods (L:D/8:16,L:D/12:12 and L: D / 16 : 8 ) on female Bufo regularis (1) survival rate, (2 ) oxygen and carbon dioxide partial pressure, and (3) sodium and potassium contents. Undiluted sea water lowered the survival rate. while the highest survival rate occured at L: D / 16 : 8 combined with 30 % SW. PO, was lower in all experimental groups than in the controls. PO, tension was higher in the blood of females exposed to L: D / 16 : 8 in all groups, except for those injected with 30 % sea water, than that in those subjected to L : D / 8 : 16 or L: D / 12 : 12. In all groups, Na and K concentration increased with the increase in sea water concentration. Ion concentration in females injected with 70% or 100% SW was Lower in the plasma of frogs exposed to L: D / 12 : 12 than that in those exposed to L:D/8: 16orL:D/ 16:8.