The coastal area in the Teramo province (middle Adriatic) is characterized, in productive terms, by the clams (Chamelea gallina) fishing through hydraulic dredges. In such context, the present research has the purpose to constitute an introductory scientific base of a project that could make feasible the institution of a protected marine area, defined as “TORRE DEL CERRANO”. Along 16 Km of marine coast between Vomano and Piomba rivers, samplings have been carried out to evaluate the community benthonic structure, the biometric analysis of molluscs, the clams defence mechanisms and their diseases. These assessments represent a cognitive base of environmental “well-being” through the study of the area general biodiversity and, more specifically, the clam population. About the community benthonic structure, the trend of main structural indexes (Margaleff, Shannon Weaver, Eveness and Pielou) has demonstrated a general spatial reduction in the biodiversity from North to South. The biometric analysis of molluscs has been carried out in three different points; the results have demonstrated the absence of sizes greater than 35 mm and the spatial increase of the average size from North to South. The defence mechanisms of the clams has been evaluated after thermic stress and, through immunoblotting with monoclonal antibody anti-hsp 70 bovine brain, the induction of a Heat Shock Protein (HSP) of approximately 70 Kda has been recorded in the mantle. Furthermore, the production of nitric oxide (NO) and reactive oxygen species (ROS), through nitrite and chemioluminescence assays, respectively, has been assessed in haemocytes of clams stimulated to phagocytize. The results have demonstrated a little increase of NO and an absence of ROS production in the haemocytes during phagocytosis. The histo-pathological examination, instead, has revealed in the clam samples the presence of gregarine oocysts and Rickettsiales-like organisms colonies. The obtained results are directed to set a methodological approach that, through continous monitoring, could unite different parameters to improve the clam resource in a context of environmental protection. [...]

Approccio preliminare per lo studio dello stock di vongole (Chamelea gallina, L.) antistante la Torre del Cerrano (TE), Mare Adriatico: una possibile Area Marina Protetta.

TISCAR, Pietro Giorgio;Della Salda L.
2003

Abstract

The coastal area in the Teramo province (middle Adriatic) is characterized, in productive terms, by the clams (Chamelea gallina) fishing through hydraulic dredges. In such context, the present research has the purpose to constitute an introductory scientific base of a project that could make feasible the institution of a protected marine area, defined as “TORRE DEL CERRANO”. Along 16 Km of marine coast between Vomano and Piomba rivers, samplings have been carried out to evaluate the community benthonic structure, the biometric analysis of molluscs, the clams defence mechanisms and their diseases. These assessments represent a cognitive base of environmental “well-being” through the study of the area general biodiversity and, more specifically, the clam population. About the community benthonic structure, the trend of main structural indexes (Margaleff, Shannon Weaver, Eveness and Pielou) has demonstrated a general spatial reduction in the biodiversity from North to South. The biometric analysis of molluscs has been carried out in three different points; the results have demonstrated the absence of sizes greater than 35 mm and the spatial increase of the average size from North to South. The defence mechanisms of the clams has been evaluated after thermic stress and, through immunoblotting with monoclonal antibody anti-hsp 70 bovine brain, the induction of a Heat Shock Protein (HSP) of approximately 70 Kda has been recorded in the mantle. Furthermore, the production of nitric oxide (NO) and reactive oxygen species (ROS), through nitrite and chemioluminescence assays, respectively, has been assessed in haemocytes of clams stimulated to phagocytize. The results have demonstrated a little increase of NO and an absence of ROS production in the haemocytes during phagocytosis. The histo-pathological examination, instead, has revealed in the clam samples the presence of gregarine oocysts and Rickettsiales-like organisms colonies. The obtained results are directed to set a methodological approach that, through continous monitoring, could unite different parameters to improve the clam resource in a context of environmental protection. [...]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11575/11219
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