Phytoplankton selection by mussels, and diarrhetic shellfish poisoning |
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| Authors: | L Sidari P Nichetto S Cok S Sosa A Tubaro G Honsell R Della Loggia |
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| Institution: | (1) Dipartimento di Biologia ed Economia Agro-Industriale, University of Udine, via Cotonificio 108, I-33100 Udine, Italy, IT;(2) Dipartimento di Economia e Merceologia delle Risorse Naturali e della Produzione, University of Trieste, via Valerio, 6, I-34127 Trieste, Italy, IT |
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| Abstract: | To better understand the dynamics of diarrhetic shellfish poisoning (DSP) contamination a field study was carried out on
the feeding behavior of Mytilus galloprovincialis (Lmk) during an important DSP outbreak. The study was focused on the relationships between phytoplankton in seawater and
algal cells, or their remnants, in mussel stomachs. During the period studied, M. galloprovincialis seemed to feed selectively on dinoflagellates rather than diatoms. Further selection was observed among different dinoflagellate
genera, a preference for the genus Dinophysis being particularly evident. In addition, mussels seemed to open the thecae of Dinophysis cells and digest them more easily than other dinoflagellates. Due to the high variability of the results of phytoplankton
analysis in the mussel stomachs, no correlation was found between the abundance of Dinophysis species in the mussels' stomachs and the content of okadaic acid plus dinophysistoxin-1 in their digestive glands, evaluated
with an ELISA assay. Conversely, the presence of Dinophysis fortii (the main DSP-causative agent in the area studied) in integrated net samples of the whole water column and the toxin content
of the digestive glands presented similar temporal trends.
Received: 24 March 1997 / Accepted: 10 December 1997 |
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