Istituto di Scienze Marine     
Mugnai C., Gerino M., Frignani M., Sauvage S., Bellucci L. G. Bioturbation experiments in the Venice Lagoon. In: Hydrobiologia, vol. 494 (40238) pp. 245 - 250. Kluwer Academic Publ, 2003.
Short experiments (14-21 days) were carried out during autumn 1998 and spring 1999 at one selected site of the Venice Lagoon to measure bioturbation activities and mixing rates, as well as to obtain quantitative information on benthos functionality. Fluorescent sediment particles (luminophores, 63-350 mum) were introduced as pulse inputs at the sediment surface. The concentration-depth profiles of the tracer were simulated with a new advection diffusion-non local model applied under non-steady state conditions. This allowed the quantification of the mixing parameters associated with different mechanisms: biodiffusion (D-b), bioadvection (W) and non-local mixing (Ke, z(1), z(2)). A parameter RS ( removed sediment) was also calculated to account for the flux of sediment due to non-local transport. Results show that bioturbation was dominated by biodiffusion in autumn and by bioadvection in spring. Mean mixing parameters Db, W, and RS changed from 3.09 to 0.87 cm(2) y(-1), from 0.93 to 15.50 y(-1) and from 5.85 to 7.79 g cm(-2) y(-1), respectively.
URL: http://www.springerlink.com/content/x81l62867r864x61/
Subject bioturbation
sediment mixing
Venice Lagoon

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