Clearly, there were no consistent trends in the various indicator
values along the inner–outer gradient in any of the harbours.
However, the three biodiversity indices (H’, J’, and S) were
negatively correlated with the concentrations of total PAHs
(p , 0.05), and S was positively correlated with the redox potential
(Eh) values at the water–sediment interface, whereas all correlations
with heavy metals were not significant (see Table 6 later). In
contrast, the Ne–Co and Ne2A–Co ratios revealed a significant
positive correlation with total heavy-metal concentrations, with
Pb specifically, and with PAHs. Although no significant correlation
was found between biodiversity indices and protein concentrations
for all pooled data, a negative correlation was found for
H’ and S in Genoa-Voltri harbour (n ¼ 12; p , 0.05).
Clearly, there were no consistent trends in the various indicatorvalues along the inner–outer gradient in any of the harbours.However, the three biodiversity indices (H’, J’, and S) werenegatively correlated with the concentrations of total PAHs(p , 0.05), and S was positively correlated with the redox potential(Eh) values at the water–sediment interface, whereas all correlationswith heavy metals were not significant (see Table 6 later). Incontrast, the Ne–Co and Ne2A–Co ratios revealed a significantpositive correlation with total heavy-metal concentrations, withPb specifically, and with PAHs. Although no significant correlationwas found between biodiversity indices and protein concentrationsfor all pooled data, a negative correlation was found forH’ and S in Genoa-Voltri harbour (n ¼ 12; p , 0.05).
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