Representative macroalgae and consumers were collected in three sampling locations:
“Impact” and two putative “Controls” sited to the north of the impacted location. While δ13C values of both organic matter sources
and consumers varied little between locations, δ15N spatial variability was higher and δ15N was shown to be a good descriptor of
organic enrichment and uptake of anthropogenically derived material within coastal food webs. Isotopic data were analysed using a
multivariate approach. Organic matter sources and benthic components were more sensitive to pollution than nektobenthic species
and revealed that the effects of anthropogenic activities seem to be detectable over a wide area. The study site is characterised by
wide waste dispersal, which brings a reduction in impact in the area directly affected by organic matter inputs and enlarges the area
of moderate impact.