NEW INSIGHTS INTO THE DYNAMICS OF THE TOXIC DINOFLAGELLATE DINOPHYSIS EHRENBERG AND DSP (DIARRHETIC SHELLFISH POISONING) EVENTS IN THE ADRIATIC SEA: IMPLICATIONS FOR SAFE MARINE AQUACULTURE PRODUCTION MANAGEMENT
NUOVE INFORMAZIONI SULLE DINAMICHE DEL DINOFLAGELLATO TOSSICO DINOPHYSIS EHRENBERG E SUGLI EVENTI DI DSP (SINDROME DIARROICA DA MOLLUSCHI) NEL MAR ADRIATICO: IMPLICAZIONI PER UNA GESTIONE SICURA DELLA PRODUZIONE DI ACQUACOLTURA MARINA
DOI:
https://doi.org/10.82008/bmm.v30i1.421Keywords:
Dinophysis, Harmful algal blooms (HABs), Long-term monitoring, mussel farming, Phytoplankton ecologyAbstract
Dinophysis spp. are harmful marine dinoflagellates that produce lipophilic toxins able to accumulate in mussels. Mussel farming is a key activity along the northern Adriatic coast, where Dinophysis dynamics, DSP toxicity events, and environmental conditions were monitored from 1998 to 2023. A clear seasonality emerged: D. acuminata (Claparède & Lachmann) and D. sacculus (F.Stein) occurred in spring–summer, followed by D. caudata (Saville-Kent), D. fortii (Pavillard), and D. tripos (Pavillard) in autumn. DSP toxicity events occurred mainly in autumn–winter, significantly correlated with D. caudata (rs = 0.84), D. fortii (rs = 0.83), and D. tripos (rs = 0.66). Some species showed preferential temperature ranges. Mussel toxicity declined with time, alongside decreasing DIN, phosphate, total phosphorus, and chlorophyll a. Nevertheless, in 2015 and 2022, prolonged toxicity events linked to colder surface waters were recorded. This study emphasises the significance of long-term monitoring to understand Dinophysis variability and improve aquaculture management.