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gcb2473-sup-0001-f1-AA.pdfapplication/PDF316KFigure S1. Coralline seaweed Sporolithon durum. pH at the apex (a–e) and within (f–k) crenulations at five mainstream velocities (0, 1.5, 4.6, 6.3 and 10 cm s–1). Five replicate individuals were used. Each point on a profile represents the average of 60 pH measurements over 1 min (±SE of the pH measurement). Experiments were conducted in March 2009 with a mainstream ambient pHNBS (±SE) of 8.11 ± 0.01.
gcb2473-sup-0002-f2-AA.pdfapplication/PDF312KFigure S2. Coralline seaweed Sporolithon durum. pH at the apex (a–e) and within (f–k) crenulations at five mainstream velocities (0, 1.5, 4.6, 6.3 and 10 cm s1). Five replicate individuals were used. Each point on a profile represents the average of 60 pH measurements averaged over 1 min (±SE of the pH measurement). Experiments were conducted in March 2009 with a mainstream pHNBS (±SE) of 7.5 ± 0.01.
gcb2473-sup-0003-f3-AA.pdfapplication/PDF276KFigure S3. Sea urchin Evechinus chloroticus (a–c) and abalone Haliotis iris (d–f). O2 concentration profiles at three mainstream velocities (1.5, 4.6, 6.3 cm s1). Three replicate individuals were used. Each point on a profile represents the average of 60 O2 concentration measurements over 1 min (±SE of the O2 concentration). Experiments were conducted in September 2009 (sea urchin) with a mainstream pHNBS of 7.79 ± 0.01 and in November 2009 (abalone) with a mainstream pHNBS of 7.89 ± 0.01 (±SE). Note that for the abalone (SI Fig. 3d), the O2 concentration at the at 1.5 cm s1 surface was higher than that of the mainstream seawater indicating O2 evolution, most likely by a thin epiphytic community.

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