Studio degli accumuli di detrito organico sui fondali del Lago di iberni: I - Analisi delle distribuzioni

Rossi, Loreto ; Picciafuoco, Laura ; Basset, Alberto

Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 83 (1989) no. 1, pp. 263-270

Résumé

The depth-time distributions of organic depositions (dry weight and ash free dry weight) on the bottoms of an hypereutrophic, volcanic lake (30 m deep) have been studied. Depositions were sampled monthly at 0.2 m, 2 m, 6 m and 30 m of depth for two consecutive years (1983-1984). Samples were collected along transects 755 m long from the shoreline to the center of the lake. It results that: 1) The amount of organic depositions is quantitatively assessed as 1.24 g/$m^{2}$/d in dry weight (i.e. 452.6 g/$m^{2}$/year) with an ash content corresponding to the 45.2% of the dry weight. 2) Allochthonous input of detritus directly affects the depositions only at sampling sites located at 0.2 m and 2 m of depth, that is max 30 m offshore.