Figure 3

(A) Cliona orientalis was more likely to occur at sites with the lowest proportion of fine sediments (z = −2.5, P = 0.01; Wald test). The line represents the probability of occurrence using a binomial generalized linear model and shading represents the 95% confidence interval. The dashed line indicates the proportion of fine sediments (17%) with a 50% predicted probability of C. orientalis occurrence. Points represent presence-absence and the average fine sediment proportion for each location. (B) Cliona orientalis cover significantly decreased as a function of the proportion of fine particles in the sediment (z = −4.9, p < 0.01; Wald test). The line represents the predicted cover from a negative binomial generalized linear model and shading represents the 95% confidence interval. Points represent average cover and fine sediment proportion for each location.