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Bioturbation in the Venice Lagoon: Rates and relationship to organisms

Gérino, Magali and Frignani, Mauro and Mugnai, Cristian and Bellucci, Luca Giorgio and Prevedelli, Daniela and Valentini, Andrea and Castelli, Alberto and Delmotte, Sébastien and Sauvage, Sabine Bioturbation in the Venice Lagoon: Rates and relationship to organisms. (2007) Acta Oecologica, vol. 32 (n° 1). pp. 14-25. ISSN 1146-609X

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Official URL: http://dx.doi.org/10.1016/j.actao.2007.02.003

Abstract

Experiments were carried out during autumn 1998 and spring 1999 at four selected sites in the Venice Lagoon in order to estimate the major bioturbation modes, and for quantitative analysis of the contribution of various taxa to these modes. Fluorescent sediment particles (63–350 μm) were supplied as a tracer pulse input at the sediment surface. Tracer depth profiles obtained after 15 and 20 days were simulated with a diffusion-advection-non-local transport model. This allowed the rates of biodiffusion (Db), bioadvection (W), and RS, a non-local transport coefficient to account for the displacement of sediment by regeneration, to be estimated. A combination of fresh water and marine organisms were responsible for the recorded sediment reworking, which was dominated by both types of non-local transports (conveying and regeneration). Considering all the sampling sites and seasons, Db ranged from 0.87 ± 0.02 to 3.17 ± 0.92 cm2 y−1, W from 0.12 ± 0.09 to 27.41 ± 2.47 cm y−1 and RS from 0.00 ± 0.00 to 5.47 ± 1.09 g cm−2 y−1 (mean ± SE, n = 3). A multiple regression analysis was applied to identify the contribution from individual species to sediment transport types. Biodiffusion resulted from the combined activity of polychaetes such as Spio decoratus and meiobenthic harpacticoïd copepods, while the polychaete Hediste diversicolor was mainly responsible for regeneration. Conveying processes were driven by another polychaete, Capitella capitata. Despite heterogeneity in the benthic community composition, biodiffusion and regeneration rates did not vary significantly between sites or season, with only bioadvection found to be higher in spring than in autumn.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com/science/article/pii/S1146609X07000306
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 > Institut National Polytechnique de Toulouse - INPT
Other partners > Università degli Studi di Modena e Reggio Emilia - UNIMORE (ITALY)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Università di Pisa (ITALY)
Laboratory name:
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Deposited By: Nadia Kelmouss
Deposited On:28 Sep 2012 08:16

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