The role of sediment resuspension in increasing bioaccumulation in Mytilus galloprovincialis has been studied during a temporal range of 28 days. A sea-water aerated microcosmo was recreated in lab through a glass tank, subdivided in two non-communicating subtanks, with a bottom layer of sediment from the Guanabara Bay (Rio de Janeiro, Brazil). This lagoon represents one of the most important and characteristic transitional water environments in the world, furthermore affected by a massive exploitation that strongly modified his biodiversity and decreased his intrinsic natural recovery capacity. Final aim of the present work has been to find out a relationship between uptake from filterer biota, load of heavy metals (Cu, Zn and Hg) in polluted sediment and detoxification process activation. A special glass instrumentation, called MODUS, allows the water oxygenation tangentially to the bottom sediment without resuspension (sub-tank 1) while in sub-tank 2 the sediment has been re-suspended by a propeller. After a rapid but gentle catch in order to avoid stress for the mussels, they have been initially placed in a stalling tank for a 15 days acclimating and digesting phase. Successively, mussels have been put in both sub-tank 1 and 2 and sampled according to the protocol. Analysis of both groups of mussels have been compared in order to assess if and how sediment resuspension is responsible for higher bioaccumulation of heavy metals. It is known, in fact, that during higher water turbidity, filterers close valves; then it should limit absorption and uptake events. Soft tissue and hepatopancreas metal contents have been used as contaminant uptake site-target, while MT concentration into digestive gland has been used as biomarker.
|Data di pubblicazione:||2007|
|Titolo:||Bivalves uptake kinetics during forced sediment resuspension.|
|Titolo del libro:||Proceedings of 1st LAGUNET Congress Joint Meeting 3rd European Conference on Lagoon Research|
|Appare nelle tipologie:||4.2 Abstract in Atti di convegno|
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|ManenteLAGUNET_Napoli2007.pdf||Abstract||Licenza non definita||Riservato|