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Detection of trace elements in the bivalve Ruditapes decussatus from Sardinian coastal lagoons: effects on food safety and pathological findings in target organs

Esposito, Giuseppe (2019) Detection of trace elements in the bivalve Ruditapes decussatus from Sardinian coastal lagoons: effects on food safety and pathological findings in target organs. Doctoral Thesis.

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Abstract

Shellfish can bioaccumulate toxic metals due to their ability to concentrate inorganic contaminants. Since biomonitoring by using bivalve molluscs is currently considered one of the most effective approaches for assessing the degree of pollution of brackish environments, the aims of this PhD thesis were: a) to detect the content of trace elements in the Grooved carpet shell Ruditapes decussatus collected in Sardinian coastal lagoons (Italy) and their effects on food safety; b) to evaluate the pathological findings in its target organs. The concentration of 16 trace elements (Al, Ag, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, Sn, Tl and Zn) was quantified. The legal limits set by European Regulations for Cd, Hg and Pb were never exceeded. Unexpectedly high values for Al and Fe were found. A total of six histopathological alterations were analysed in the digestive gland, gills and kidney following a weighted condition indices approach. Gills show the highest prevalence of lesions than digestive gland, followed by kidney. The clam R. decussatus confirmed the capacity of bivalves as suitable bioindicators of trace elements pollution.
The determination of trace elements combined with histopathological analysis, should be a powerful tool in environmental monitoring plans. It is useful for understanding directly the health status of the marine organisms and indirectly the impact which different anthropogenic activities have on shellfish harvested in coastal environments.

Item Type:Doctoral Thesis
ID Code:11976
Contributors:Meloni, Domenico
Publisher:Universita' degli studi di Sassari
Uncontrolled Keywords:trace elements; Ruditapes decussatus; coastal lagoons; food safety; veterinary pathology
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/20 Zoocolture
Area 07 - Scienze agrarie e veterinarie > VET/03 Patologia generale e anatomia patologica veterinaria
Area 07 - Scienze agrarie e veterinarie > VET/04 Ispezione degli alimenti di origine animale
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Medicina Veterinaria
Cicli, scuole e corsi:Ciclo 31 > Scienze veterinarie > Qualità e sicurezza alimentare
Deposited On:19 Apr 2019 13:48

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