by Hannah C. Barkley, Anne L. Cohen, Yimnang Golbuu, Victoria R

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Changes in coral reef communities across a natural gradient in seawater pH by Hannah C. Barkley, Anne L. Cohen, Yimnang Golbuu, Victoria R. Starczak, Thomas M. DeCarlo, and Kathryn E. F. Shamberger Science Volume 1(5):e1500328 June 5, 2015 Copyright © 2015, The Authors

Fig. 1 Natural acidification gradient across Palau mirrors projected anthropogenic CO2-driven changes in ocean chemistry. Natural acidification gradient across Palau mirrors projected anthropogenic CO2-driven changes in ocean chemistry. Shown are the mean (±1 SD) dawn-to-dusk pH and Ωar for our 11 reef study sites and diurnal pH variability at three of those sites over 4 days (inset) (fig. S1: sites 1, 2, and 10). Shaded regions indicate the range of western tropical Pacific open ocean pH and Ωar levels in 2000 (blue) and open ocean values predicted for 2050 (orange) and 2100 (red) (12, 52). Colored points correspond to pH time series in inset. Hannah C. Barkley et al. Sci Adv 2015;1:e1500328 Copyright © 2015, The Authors

Fig. 2 Palau coral reef community responses to acidification. Palau coral reef community responses to acidification. (A) Mean (±1 SE) percent coral cover per transect (n = 5 per site) from 2010 to 2012 (circles) versus site mean Ωar (±1 SD) with pre-1998 bleaching barrier coral cover (18) and estimated Ωar (16) from 1992 to 1994 (red circle). (B) Number of coral genera observed (richness). (C and D) Macroalgae (C) and crustose coralline algae (CCA) (D). (E and F) Percent cover of Porites spp. (E) and Acropora spp. (F). Hannah C. Barkley et al. Sci Adv 2015;1:e1500328 Copyright © 2015, The Authors

Fig. 3 Detrended correspondence analysis (DCA) scores for eight Palauan reef sites and coral genera. Detrended correspondence analysis (DCA) scores for eight Palauan reef sites and coral genera. DCA scores are for each of five transects collected per reef site (circles, colored by mean Ωar for each site) and their coral genera (names abbreviated). See table S6 for genus abbreviations. Hannah C. Barkley et al. Sci Adv 2015;1:e1500328 Copyright © 2015, The Authors

Fig. 4 Skeletal growth responses of two coral genera to acidification. Skeletal growth responses of two coral genera to acidification. (A to H) Skeletal analyses include 2006–2010 site mean (±1 SE) extension (ext.), density (den.), and calcification rates (calc.) for Porites (A, C, and E) and Favia (B, D, and F); percent Porites skeletal volume macrobioeroded (G) versus Ωar (±1 SD); and the relationship between Porites density and skeletal volume macrobioeroded (H). Hannah C. Barkley et al. Sci Adv 2015;1:e1500328 Copyright © 2015, The Authors