Gastrointestinal helminth communities of the blackspot seabreamPagellus bogaraveo(Teleostei: Sparidae) from Portuguese north-east Atlantic waters

Abstract

AbstractA study was carried out on the gastrointestinal helminth communities of blackspot seabream,Pagellus bogaraveo, from the Portuguese mainland and island waters. Fifteen helminth parasite species were detected, including the following new records in this host: the digeneansAccacladocoelium petasiporum,Brachyenteron helicoleni,Glomericirrus macrouri,Lecithocladium excisum,Lepocreadium albumandPachycreadium carnosum; the nematodeCamallanussp. and the acanthocephalanRhadinorhynchus pristis. Infection levels were generally low. Samples from mainland waters had a significantly higher prevalence of digeneans than those from the islands, probably due to the greater availability of invertebrate intermediate hosts on the continental slope. The helminth community ofP. bogaraveofrom Azores was diverse but mostly composed of species that infected no more than a single host, whereas in Madeira the helminth community was very depauperate. Most helminth species exhibited niche preferences within the gastrointestinal tract of the host. Higher functional richness and evenness were obtained in helminth communities ofP. bogaraveofrom mainland waters, indicating a balanced use of available resources, which is suggestive of more stable gastrointestinal helminth communities in these waters.