Fig. 2

a-d Boxplots of diversity indices (Shannon, H’ and Pielou, J) calculated between (a, b) the two seasons (Winter, Wi; Summer, Su), and (c, d) across the fishing areas (Margherita di Savoia = Mar; Barletta = Bar; Lesina = Les, and Varano = Var). Different letters beside the box plots indicate significant differences in diversity indices between areas across seasons based on the Mann–Whitney pairwise Bonferroni-corrected test (U, p < 0.05)