Biological and physical drivers of bio-mediated sediment resuspension: A flume study on Cerastoderma edule

Type Article
Date 2020-08
Language English
Author(s) Cozzoli Francesco1, 2, 3, Gomes Da Conceição Tatiana2, Van Dalen Jeroen2, Fang Xiaoyu4, Gjoni Vojsava1, Herman Peter M.J.5, 6, Hu Zhan7, 8, Soissons Laura2, 9, Walles Brenda10, Ysebaert Tom2, 10, Bouma Tjeerd J.
Affiliation(s) 1 : Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, University of the Salento, 73100, Lecce, Italy
2 : Department of Estuarine and Delta Systems. Royal Netherlands Institute of Sea Research (NIOZ) and Utrecht University, 4401, NT Yerseke, the Netherlands
3 : Research Institute on Terrestrial Ecosystems (IRET) - National Research Council of Italy (CNR), via Salaria km 29.3 – 00015, Monterotondo Scalo (Roma), Italy
4 : Marine Biology Research Group, Department of Biology, Ghent University, 9000, Ghent, Belgium
5 : Department of Hydraulic Engineering, Delft University of Technology, 2628 CN, P.O. Box 5048 2600GA, Delft, the Netherlands
6 : Deltares, P.O. Box 177 2600, MH, Delft, the Netherlands
7 : Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering and School of Marine Science, Sun Yat-sen University, Guangzhou, China
8 : Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, China
9 : MARBEC, Univ. Montpellier, CNRS, Ifremer, IRD, Sète, France
10 : Wageningen Marine Research, Wageningen University and Research, P.B. 77, 4400 AB, Yerseke, the Netherlands
Source Estuarine Coastal And Shelf Science (0272-7714) (Elsevier BV), 2020-08 , Vol. 241 , P. 106824 (12p.)
DOI 10.1016/j.ecss.2020.106824
WOS© Times Cited 6
Keyword(s) Bioturbation, Cohesiveness, Body size, Allometry, Sediment resuspension, Cerastoderma edule
Abstract

Predictive models accounting for the effect of bioturbation on sediment resuspension must be based on ecological theory as well as on empirical parametrizations. The scaling trend of individual metabolic and activity rates with body mass may be a key to the mechanistic understanding of the observed patterns. With this study we tested if general size scaling rules in bio-mediated sediment resuspension may apply to a broad range of physical contexts for the endobenthic bivalve Cerastoderma edule. The effect on sediment resuspension of populations of C. edule differing by individual size was measured across physical gradients of current velocity and sediment composition in terms of fraction of fine particles. C. edule were able to enhance the resuspension of sediment containing silt, while they had scarce effect on the resuspension of coarse sediment. The effect of bioturbation was maximal at intermediate current velocity, when the hydrodynamic forcing is not strong enough to overcome the abiotic sediment resistance but it is able to suspend the bioturbated sediment. Although differences in sediment silt content and intensities of hydrodynamic stress have a relevant influence in determining the bioturbators individual contribution to sediment resuspension, the observed mass scaling trend is consistent across all treatments and close to theoretical expectation for size scaling of individual metabolic rates. This observation supports the hypothesis that the contribution of individual bioturbators to sediment resuspension is directly related to their energy use. Therefore, the proposed approach allows the formulation of expectations of biotic contribution to sediment resuspension based on the general size scaling laws of individual energy use.

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Cozzoli Francesco, Gomes Da Conceição Tatiana, Van Dalen Jeroen, Fang Xiaoyu, Gjoni Vojsava, Herman Peter M.J., Hu Zhan, Soissons Laura, Walles Brenda, Ysebaert Tom, Bouma Tjeerd J. (2020). Biological and physical drivers of bio-mediated sediment resuspension: A flume study on Cerastoderma edule. Estuarine Coastal And Shelf Science, 241, 106824 (12p.). Publisher's official version : https://doi.org/10.1016/j.ecss.2020.106824 , Open Access version : https://archimer.ifremer.fr/doc/00632/74386/