Locations of survey sites with high (solid squares, numbered 1–5) and low visitor use (open circles, numbered 6–10) around the island of Koh Tao, Thailand. Individual
pie charts represent the mean proportion of coral colonies at each site classified within 4 health status categoriesa
: disease (including (A) white syndromes, (B) black band
disease, (C) growth anomalies, and (D) skeletal eroding band disease); (E) physical damage (recently exposed skeleton); other compromised health indicators (including (F)
sponge overgrowth, (G) non-normally pigmented tissue responses, (H) algae overgrowth, (I) sediment damage, and (J) bleaching; or healthy. Category means were calculated
from 3 transects per site. Percentages indicated within each pie graph represent healthy colonies. a Standardised signs of disease and compromised coral health as per Beeden
et al. (2008), an output of the Global Environment Facility and World Bank Coral Disease Working Group.