Results of the two-way ANOSIM (global and pairwise tests) for the MDS performed with samples collected in 2005, 2006 and 2007 to assess interannual and seasonal differences.

2004 was excluded because it does not represent a complete sampling year. The statistic estimated for each permutation is significant when its value is greater than or equal to the sample statistic. Significance level is calculated as the percentage of significant statistics in the total number of permutations used. R: Sample statistic.