The dendrogram from the cluster analysis revealed two major groups of coral species change during 2004–2010: high and low levels in change of coral cover ( Fig. 7 and Fig. 8). P. lutea and F. abdita were grouped at a high level of change in coral cover, while a low level of change in coral cover can be further grouped into four sub-divisions. Furthermore, the coral cover of P. lutea and F. abdita at Ao Thong Krut were shown to be at a higher level of change than Ao Tongtanote.