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Bioturbation experiments in the Venice Lagoon

Mugnai, Cristian and Gérino, Magali and Frignani, Mauro and Sauvage, Sabine and Bellucci, Luca Giorgio Bioturbation experiments in the Venice Lagoon. (2003) Hydrobiologia, vol. 494 (n°1-3). pp. 245-250. ISSN 0018-8158

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Official URL: http://dx.doi.org/10.1023/A:1025430719520

Abstract

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 μm) 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 (Db), bioadvection (W) and non-local mixing (Ke,z1, z2). A parameter RS (removed sediment) was also calculated to account for the flux of sediment due to nonlocal 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 cm2 y−1, from 0.93 to 15.50 y−1 and from 5.85 to 7.79 g cm−2 y−1, respectively.

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at http://www.springer.com The original PDF of the article can be found at Hydrobiologia website : http://link.springer.com/article/10.1023%2FA%3A1025430719520
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Consiglio Nazionale delle Ricerche - CNR (ITALY)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By:Nadia Kelmouss

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