Fig. 3

Mean coral larval settlement of broadcast spawning species in response to CYPRO. Settlement was monitored after one and two days. Note that CYPRO has a very low water solubility and thus the concentration of the pigment is specified in µg cm^− 2. Pictures in the upper right corner of each graph show a corresponding coral recruit after 48 h (day 2). Error bars represent standard error (SE). Differences within each time point between the negative control and the different CYPRO treatments as well as the positive control were evaluated per experiment using non-parametric Kruskal-Wallis tests, followed by pairwise Dunn tests (α = 0.05). Asterisk indicate the level of significance difference between NEG control and CYPRO treatment or POS control within each timepoint, with n.s. = not significant; * = p > 0.05; ** = p > 0.005 and *** = p > 0.001. Acropora humilis, kenti and microclados: 3 replicates with 5 larvae each, Acropora hemprichii: 3 replicates with 4 larvae each (in one control well were 5 instead of 4 larvae), Acropora millepora: 3 replicates for the concentrations 0.05; 0.08; 0.31 and 0.42 µg cm^− 2 and 6 replicates for NEG; POS; 0.1 and 0.21 µg cm^− 2.