engleski

Seasonal variability in Dinophysis spp. abundances and diarrhetic shellfish poisoning outbreaks along the eastern Adriatic coast

Annual dynamics and ecological characteristics of genus Dinophysis spp. and associated shellfish toxicity events were studied during monitoring fieldwork in the coastal waters of the eastern Adriatic Sea from 2001 to 2005. Analysis of seasonal distribution of Dinophysis species identified D. acuminata and D. sacculus as typical spring species, D. caudata, D. fortii and D. rotundata as summer and late summer species and D. tripos as a winter species. The highest abundances occurred when there were large differences between surface and bottom temperatures and salinities. D. caudata, D. sacculus and D. rotundata showed significant relation with Δ t, while the highest abundances of D. acuta, D. fortii and D. tripos were associated with high Δ s values. Much higher abundances of D. caudata and D. fortii in offshore compared to inshore waters of the Northern Adriatic and significant inverse relation of these species with salinity suggested the possibility of their transport by the Italian river-influenced coastal waters towards the eastern Croatian coast during the summer season and under stratified conditions. Toxicity events occurred more frequently in the more eutrophicated Northern Adriatic than in the Southern Adriatic and mostly succeeded the rainfall periods. DSP toxin profile analyses identified okadaic acid (OA) and yessotoxin (YTX) as main DSP toxins occurring in Croatian waters.

Dinophysis spp.; algal toxins; shellfish toxicity; Adriatic Sea

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