Table 2 Carbon uptake efficiency (k_0.5) and photosynthetic maximum (P_max) of a non-CCM red (Hymenena palmata) and CCM brown species (Xiphophora gladiata) under high- and low-mixing conditions and high (8.1) and low (7.6) pH.

Species	Mixing	pH	k_0.5 (mM_DIC)	P_max (μmol O g⁻¹ FW s⁻¹)
Hymenena palmate (Non-CCM)	High	8.1	0.4062 ± 0.0160^a	0.0063 ± 0.0005^a
	Low	8.1	0.5424 ± 0.1354^b	0.0043 ± 0.0005^b
	High	7.6	0.2080 ± 0.0502^c	0.0056 ± 0.0005^a,b
	Low	7.6	0.3668 ± 0.0713^a	0.0059 ± 0.0005^a,b
Xiphophora gladiata (CCM)	High	8.1	0.1426 ± 0.008ⁱ	0.0038 ± 0.0005ⁱ
	Low	8.1	0.2938 ± 0.0955^j	0.0033 ± 0.0005ⁱ
	High	7.6	0.2141 ± 0.0116^k	0.0034 ± 0.0005ⁱ
	Low	7.6	0.6794 ± 0.1887^l	0.0036 ± 0.0005ⁱ

Values represent mean ± SE, n = 4.
Simultaneous t tests were used to test for significant differences between the water motion and pH treatments within each species, with a p-value < 0.05 indicating a significant difference.
Different lowercase letters indicate significant differences between values, while the same letter indicates there is no significant difference.

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