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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
Set	Region	pH	[NH₄Cl] (mmol l^-1)	0 h	6 h	24 h	pH after 24 h
1	Head	7	0	0.043±0.005	1.1±0.1	3.2±0.3^{^a},^{^b}	7.04±0.06
	Tail	7	0	0.042±0.006	0.049±0.006	0.53±0.21^{^a},^{^b}	7.01±0.04
2	Head	7	0	0.038±0.004	1.0±0.2^{^a}	3.0±0.2^{^a},^{^b}	7.01±0.05
	Tail	7	30	30.5±0.3	29.8±0.5	29.4±0.2	7.12±0.06
3	Head	7	30	30.1±0.3	30.9±0.4	33.3±0.5^{^a},^{^b}	6.82±0.03
	Tail	7	30	30.1±0.2	29.8±0.3	29.2±0.2	7.09±0.04
4	Head	7	30	30.1±0.2	33.5±0.3^{^a}	39.3±0.6^{^a},^{^b}	6.85±0.04
	Tail	8	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
Set	Region	pH	[NH₄Cl] (mmol l^-1)	0 h	6 h	24 h	pH after 24 h
1	Head	7	0	0.043±0.005	1.1±0.1	3.2±0.3^{^a},^{^b}	7.04±0.06
	Tail	7	0	0.042±0.006	0.049±0.006	0.53±0.21^{^a},^{^b}	7.01±0.04
2	Head	7	0	0.038±0.004	1.0±0.2^{^a}	3.0±0.2^{^a},^{^b}	7.01±0.05
	Tail	7	30	30.5±0.3	29.8±0.5	29.4±0.2	7.12±0.06
3	Head	7	30	30.1±0.3	30.9±0.4	33.3±0.5^{^a},^{^b}	6.82±0.03
	Tail	7	30	30.1±0.2	29.8±0.3	29.2±0.2	7.09±0.04
4	Head	7	30	30.1±0.2	33.5±0.3^{^a}	39.3±0.6^{^a},^{^b}	6.85±0.04
	Tail	8	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).

Significantly different from the 0 h value

significantly different from the 6 h value

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