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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
Head 0.043±0.005 1.1±0.1 3.2±0.3a,b 7.04±0.06 
 Tail 0.042±0.006 0.049±0.006 0.53±0.21a,b 7.01±0.04 
Head 0.038±0.004 1.0±0.2a 3.0±0.2a,b 7.01±0.05 
 Tail 30 30.5±0.3 29.8±0.5 29.4±0.2 7.12±0.06 
Head 30 30.1±0.3 30.9±0.4 33.3±0.5a,b 6.82±0.03 
 Tail 30 30.1±0.2 29.8±0.3 29.2±0.2 7.09±0.04 
Head 30 30.1±0.2 33.5±0.3a 39.3±0.6a,b 6.85±0.04 
 Tail 30 30.1±0.3 29.0±0.2 28.3±0.3 7.86±0.05 
Condition
[Ammonia] (mmol l-1) in the external medium
SetRegionpH[NH4Cl] (mmol l-1)0 h6 h24 hpH after 24 h
Head 0.043±0.005 1.1±0.1 3.2±0.3a,b 7.04±0.06 
 Tail 0.042±0.006 0.049±0.006 0.53±0.21a,b 7.01±0.04 
Head 0.038±0.004 1.0±0.2a 3.0±0.2a,b 7.01±0.05 
 Tail 30 30.5±0.3 29.8±0.5 29.4±0.2 7.12±0.06 
Head 30 30.1±0.3 30.9±0.4 33.3±0.5a,b 6.82±0.03 
 Tail 30 30.1±0.2 29.8±0.3 29.2±0.2 7.09±0.04 
Head 30 30.1±0.2 33.5±0.3a 39.3±0.6a,b 6.85±0.04 
 Tail 30 30.1±0.3 29.0±0.2 28.3±0.3 7.86±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

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