Table 3.

Rates of competitive displacement (RCD±standard error) in the competition experiments

RCD was calculated as the slope of a linear regression of ln(X₁/X₂) versus time, where X₁ and X₂ are the population densities of species 1 and species 2. The coefficient of determination (R²), number of data points (n) and significance (P) of the linear regression are indicated.

Competition experiment	RCD (d–1)	R 2	n	P
Monoraphidium vs Microcystis
Low pCO2	–0.250 ± 0.008	0.99	14	<0.001
High pCO2	–0.043 ± 0.005	0.88	11	<0.001
Monoraphidium vs Scenedesmus
Low pCO2	–0.292 ± 0.021	0.97	8	<0.001
High pCO2	–0.021 ± 0.002	0.84	20	<0.001
Monoraphidium vs Chlorella
Low pCO2	–0.100 ± 0.008	0.93	16	<0.001
High pCO2	–0.062 ± 0.008	0.82	15	<0.001
Scenedesmus vs Microcystis
Low pCO2	+0.654 ± 0.071	0.95	6	<0.001
High pCO2	0.000 ± 0.003	0.00	11	n.s.
Microcystis vs Chlorella
Low pCO2	–0.039 ± 0.071	0.96	11	<0.001
High pCO2	+0.197 ± 0.025	0.92	11	<0.001