The Company of Biologists

Table 1.

Parameters for the rectangular hyperbola and linear models describing the relationship between the chlorophyll_a+b-normalized O₂ flux and freestream velocity of the freshwater macrophytes,Vallisneria spiralis and Vallisneria americana, determined upstream or downstream from the leading edge of the leaf

					Chlorophyll_a+b-normalized O₂ flux [mmol m^–2 s^–1 (g_chla+bm^–2)^–1]
[CO₂] (mmol m^–3)	Species	N	Location	Model	P_max or Slope	V or Intercept
17.1	V. spiralis	6	US	Nonlinear	0.013±0.0010^{^***}	0.45±0.14^{^**}
17.1	V. spiralis	6	DS	Nonlinear	0.011±0.0009^{^***}	0.45±0.14^{^**}
17.1	V. americana	6	US	Nonlinear	0.008±0.0008^{^***}	0.45±0.14^{^**}
17.1	V. americana	6	DS	Nonlinear	0.007±0.0008^{^***}	0.45±0.14^{^**}
17.1	V. americana (twisted)	8	DS	Nonlinear	0.005±0.0008^{^***}	0.45±0.14^{^**}
1.71	Both	15	US	Nonlinear	0.007±0.0005^{^***}	0.20±0.10 (P=0.07)
1.71	Both	15	DS	Linear	0.057±0.0105^{^***}	0.36±0.03^{^**}

					Chlorophyll_a+b-normalized O₂ flux [mmol m^–2 s^–1 (g_chla+bm^–2)^–1]
[CO₂] (mmol m^–3)	Species	N	Location	Model	P_max or Slope	V or Intercept
17.1	V. spiralis	6	US	Nonlinear	0.013±0.0010^{^***}	0.45±0.14^{^**}
17.1	V. spiralis	6	DS	Nonlinear	0.011±0.0009^{^***}	0.45±0.14^{^**}
17.1	V. americana	6	US	Nonlinear	0.008±0.0008^{^***}	0.45±0.14^{^**}
17.1	V. americana	6	DS	Nonlinear	0.007±0.0008^{^***}	0.45±0.14^{^**}
17.1	V. americana (twisted)	8	DS	Nonlinear	0.005±0.0008^{^***}	0.45±0.14^{^**}
1.71	Both	15	US	Nonlinear	0.007±0.0005^{^***}	0.20±0.10 (P=0.07)
1.71	Both	15	DS	Linear	0.057±0.0105^{^***}	0.36±0.03^{^**}

US, upstream, x=1 cm; DS, downstream, x=7 cm

Values for P_max and V are means ±s.e.m.

P<0.01

***

P<0.001

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