Fig. 5
Diurnal and nocturnal (a) abundance (N) and (b) percentage (%) of the main molluscan taxonomical groups in a Zostera marina bed. Percentage of each taxonomic group in relation to the mean number of individuals from that group found in the diurnal and in the nocturnal samples within the same month. Mean + standard deviation. Symbols represent the probability value obtained in one-factor ANOVA analysis (diurnal vs. nocturnal abundance); **P < 0.001, *P < 0.005, o P < 0.1