Skip to Main content Skip to Navigation
Journal articles

Bioturbation in the Venice Lagoon: Rates and relationship to organisms

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.
Complete list of metadata

Cited literature [42 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00793425
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Friday, February 22, 2013 - 12:11:35 PM
Last modification on : Tuesday, May 4, 2021 - 3:38:03 PM
Long-term archiving on: : Sunday, April 2, 2017 - 4:21:55 AM

File

Gerino_5875.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Magali Gérino, Mauro Frignani, Cristian Mugnai, Luca Giorgio Bellucci, Daniela Prevedelli, et al.. Bioturbation in the Venice Lagoon: Rates and relationship to organisms. Acta Oecologica, Elsevier, 2007, vol. 32, pp. 14-25. ⟨10.1016/j.actao.2007.02.003⟩. ⟨hal-00793425⟩

Share

Metrics

Record views

546

Files downloads

597