Final answer:
Without the specific graph (fig. 16.11) referenced in the question, it is impossible to determine which community the blue line represents; the question pertains to a species accumulation curve in an ecological study.
Step-by-step explanation:
The question asked refers to a species accumulation curve presented in an unspecified graph, which is a plot describing the rate at which new species are found as a function of the effort or area sampled. Species accumulation curves are commonly used in ecology and biodiversity studies to estimate the richness of a community and to make decisions about conservation strategies. As the actual figure (fig. 16.11) mentioned in the question is not provided, it is impossible to determine the correct answer without access to the specified graph. Therefore, I am unable to accurately identify which community the blue line represents in this study by Hughes and colleagues. To answer this question correctly, I would need the visual context of the graph referenced in the question.