Observations of Tidal Flat Sedimentation within a Native and an Exotic Spartina Species

Type Article
Date 2021-06
Language English
Author(s) Proença BarbaraORCID1, 2, Ganthy Florian3, Michalet Richard1, Sottolichio Aldo1
Affiliation(s) 1 : EPOC UMR CNRS 5805, University of Bordeaux, Allée Geoffroy St. Hilaire, CEDEX, 33615 Pessac, France
2 : Department of Geology, Faculty of Science of the University of Lisbon, IDL, Bloco C6 2º piso, Campo Grande, 1749-016 Lisboa, Portugal
3 : Ifremer LER/AR, Quai du Commandant Silhouette, 33120 Arcachon, France
Source Water (2073-4441) (MDPI AG), 2021-06 , Vol. 13 , N. 11 , P. 1566 (20p.)
DOI 10.3390/w13111566
Note This article belongs to the Special Issue Hydro-Sedimentary Processes and Methods in Estuarine and Coastal Environments
Keyword(s) cordgrass, mesotidal lagoon, ecosystem engineering, field experiment, acoustic altimetry, sedimentation, erosion patterns

Field measurements of bed elevation and related wave events were performed within a tidal marsh, on two cordgrass species, Spartina anglica (exotic) and Spartina maritima (native), in the Bay of Arcachon (SW France). Bed- and water-level time series were used to infer on the sediment behavior patterns from short to long term. A consistent response was found between the bed-level variation and the wave forcing, with erosion occurring during storms and accretion during low energy periods. Such behavior was observed within the two species, but the magnitude of bed-level variation was higher within the native than the exotic Spartina. These differences, in the order of millimeters, were explained by the opposite allocation of biomass of the two species. On the long term, the sedimentation/erosion patterns were dominated by episodic storm events. A general sediment deficit was observed on the site, suggested by an overall bed-level decrease registered within both species. However, further verification of within species variation needs to be considered when drawing conclusions. Despite possible qualitative limitations of the experimental design, due to single point survey, this work provides original and considerable field data to the understanding the different species ability to influence bed sediment stabilization and their potential to build marsh from the mudflat pioneer stage. Such information is valuable for coastal management in the context of global change

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