Fig. 4

Comparison of dinoflagellate assemblage alpha diversity at depth zones (D1: 5–10 m, D2: 20–30 m, D3: 45–60 m, D4: 95–120 m, D5: 130–150 m) at Station A, B, and C. (A) Dominance Index, (B) Rarity Index, (C) Observed Richness, and (D) Shannon Diversity. Box boundaries are the interquartile range (IQR); whiskers 1.5 times the IQR; mid-line inside the box is the median. Data from the three stations are combined because PERMANOVA showed no significant differences among stations for any of these indices. Significant differences among different depths are indicated by different lower-case letters