Table 3.

Ammonia concentration in the external medium in the head or tail compartments of the chamber in which P. schlosseri was exposed for 24 h to 0 or 30 mmol l-1 NH4Cl at pH 7.0 in the head compartment and 0 or 30 mmol l-1 NH4Cl at pH 7.0 or pH 8.0 in the tail compartment

Condition [Ammonia] (mmol l-1) in the external medium
SetRegionpH[NH4Cl] (mmol l-1)0 h6 h24 hpH after 24 h
1Head700.043±0.0051.1±0.13.2±0.3a,b7.04±0.06
Tail700.042±0.0060.049±0.0060.53±0.21a,b7.01±0.04
2Head700.038±0.0041.0±0.2a3.0±0.2a,b7.01±0.05
Tail73030.5±0.329.8±0.529.4±0.27.12±0.06
3Head73030.1±0.330.9±0.433.3±0.5a,b6.82±0.03
Tail73030.1±0.229.8±0.329.2±0.27.09±0.04
4Head73030.1±0.233.5±0.3a39.3±0.6a,b6.85±0.04
Tail83030.1±0.329.0±0.228.3±0.37.86±0.05
  • Specimens were exposed to 30 mmol l-1 NH4Cl at pH 7.0 for 6 days prior to the chamber experiment.

    Values are means ± s.e.m. (N=5).

  • a Significantly different from the 0 h value

  • b significantly different from the 6 h value