Based on Bray–Curtis, Sørensen and modified Gower dissimilar-ity matrices, the average dispersion measures for each station weresummarized in Fig. 4. The both dispersion measures (ZBCand ZS)based on community structure and species composition showed adecreasing trend from station A to D (Fig. 4a and b), compared tothe measure ZMG(Fig. 4c).Linear regression and correlation analyses showed that the dis-persion measures ZBCand ZSwere significantly correlated withthe values of -diversity index, whereas the measure ZMGwas not(Fig. 4d–f).