The Company of Biologists

Table 4.

The slope and intercept of regressions^{^†}for the upstream and downstream locations of Vallisneria spiralis and Vallisneria americana (flat and twisted configuration) determined directly from O₂ profiles

[CO₂] (mmol m^–3)	Species	N	Location	Slope	Intercept	r²	P
17.1	V. spiralis	6	US	–0.47±0.12	0.31±0.29	0.67	^**	a
17.1	V. spiralis	6	DS	–0.82±0.09	0.93±0.27	0.93	^{^***}	b
17.1	V. americana	6	US	–0.51±0.11	0.30±0.26	0.74	^**	a
17.1	V. americana	6	DS	–0.68±0.10	0.55±0.31	0.87	^{^***}	c
17.1	V. americana (twisted)	8	DS	–0.74±0.07	0.64±0.21	0.95	^{^***}	c
1.71	V. spiralis	9	US	–0.46±0.06	0.24±0.14	0.89	^{^***}	a
1.71	V. spiralis	9	DS	–0.63±0.04	0.39±0.12	0.98	^{^***}	b,c
1.71	V. americana	6	US	–0.44±0.12	0.15±0.27	0.67	^{^*}	a

[CO₂] (mmol m^–3)	Species	N	Location	Slope	Intercept	r²	P
17.1	V. spiralis	6	US	–0.47±0.12	0.31±0.29	0.67	^**	a
17.1	V. spiralis	6	DS	–0.82±0.09	0.93±0.27	0.93	^{^***}	b
17.1	V. americana	6	US	–0.51±0.11	0.30±0.26	0.74	^**	a
17.1	V. americana	6	DS	–0.68±0.10	0.55±0.31	0.87	^{^***}	c
17.1	V. americana (twisted)	8	DS	–0.74±0.07	0.64±0.21	0.95	^{^***}	c
1.71	V. spiralis	9	US	–0.46±0.06	0.24±0.14	0.89	^{^***}	a
1.71	V. spiralis	9	DS	–0.63±0.04	0.39±0.12	0.98	^{^***}	b,c
1.71	V. americana	6	US	–0.44±0.12	0.15±0.27	0.67	^{^*}	a

Measurement technique = microsensor. US, upstream; DS, downstream locations

Values for slope and intercept are means ± s.e.m. Lowercase letters indicate slopes that are statistically similar

†

log(δ_CBLχ^–1) vs log(Sc^–CRe_x) (C=0.33)

P<0.05

***

P<0.001

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