The Company of Biologists

Table 1.

Effects of water P_O₂ on aerial respiratory parameters of Odontamblyopus lacepedii

Water P_O₂ (kPa)	N	% Air-breathing fish	f_AB (breaths h^-1)^{^a}	Breath-holding duration (% of total time of observation)^{^a}
Field burrow
2.5^{^b}	7	71.4	7.3±2.9	53.7±28.7
Laboratory chamber
1.0	14	100	10.8±6.1^*	88.4±6.3^*
3.1	14	35.7	7.9±5.5^*	58.4±38.0^*
6.2	14	35.7	1.5±0.9	0.1±0.1
10.4	14	21.4	2.0±2.6	0.1±0.2
20.7	14	0	0	0

Water P_O₂ (kPa)	N	% Air-breathing fish	f_AB (breaths h^-1)^{^a}	Breath-holding duration (% of total time of observation)^{^a}
Field burrow
2.5^{^b}	7	71.4	7.3±2.9	53.7±28.7
Laboratory chamber
1.0	14	100	10.8±6.1^*	88.4±6.3^*
3.1	14	35.7	7.9±5.5^*	58.4±38.0^*
6.2	14	35.7	1.5±0.9	0.1±0.1
10.4	14	21.4	2.0±2.6	0.1±0.2
20.7	14	0	0	0

Values presented are means ± s.d. of the air-breathing individuals.

Based from the asymptote of a curve of burrow-water P_O₂ (see legend for Fig. 4).

Significant difference from normoxic water(P_O₂=20.7 kPa) (Dunnett's test, P<0.05).