Spatiotemporal dynamics of surface sediment characteristics and benthic macrofauna compositions in a temperate high-energy River-dominated Ocean Margin
| Type | Article | ||||||||||||
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| Date | 2022-09 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Lamarque Bastien 1, Deflandre Bruno2, Schmidt Sabine2, Bernard Guillaume1, Dubosq Nicolas2, Diaz Melanie2, Lavesque Nicolas1, Garabetian Frédéric1, Grasso Florent3, Sottolichio Aldo2, Rigaud Sylvain4, Romero-Ramirez Alicia1, Cordier Marie-Ange2, Poirier Dominique2, Danilo Martin2, Grémare Antoine1 |
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| Affiliation(s) | 1 : UMR EPOC, Université de Bordeaux, CNRS, UMR 5805, Station Marine d’Arcachon, 2 rue du Professeur Jolyet, 33120, Arcachon, France 2 : UMR EPOC, Université de Bordeaux, CNRS, UMR 5805, Bâtiments B18/B18N, Allée Geoffroy Saint-Hilaire, CEDEX, 33615, Pessac, France 3 : IFREMER, DYNECO/DHYSED, Centre de Bretagne, CS 10070, 29280, Plouzané, France 4 : Université de Nîmes, EA 7352 CHROME, rue du Dr Georges Salan, 30021, Nîmes, France |
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| Source | Continental Shelf Research (0278-4343) (Elsevier BV), 2022-09 , Vol. 247 , P. 104833 (15p.) | ||||||||||||
| DOI | 10.1016/j.csr.2022.104833 | ||||||||||||
| WOS© Times Cited | 3 | ||||||||||||
| Keyword(s) | RiOMar, West gironde mud patch, North-East Atlantic shelf, Particulate organic matter, Benthic macrofauna, Spatiotemporal changes, Hydrodynamics, Storms | ||||||||||||
| Abstract | The benthic compartment of River-dominated Ocean Margins (RiOMar) is largely affected by sedimentary processes, as well as by natural and anthropogenic disturbances. Recent studies have confirmed the major importance of riverine inputs and local hydrodynamics in the spatial structuration of low- and high-energy temperate RiOMar, respectively. Differences in the nature of these structuring factors could also affect the temporal dynamics of these two types of systems. The present study is aiming at: (1) quantifying spatiotemporal changes in surface sediment and benthic macrofauna within the West Gironde Mud Patch (WGMP; high-energy system) over both short (2016–2018) and long (2010–2018) time scales, (2) identifying the main environmental factors controlling those changes, and (3) achieving a comparison with the Rhône River Prodelta (RRP; low-energy system) in view of further characterizing the functioning of the benthic components of these two temperate RiOMar. Surface sediment characteristics (grain size, quantitative and qualitative descriptors of particulate organic matter) and benthic macrofauna compositions were assessed based on 4 seasonal sampling of 5 stations located along a depth gradient within the WGMP. Results highlighted the existence of spatial patterns for both surface sediment and benthic macrofauna, which are cued by local hydrodynamics. Most variables presented seasonal changes. Benthic macrofauna compositions also showed pluri-annual changes, which were attributed to a cicatrization process following a major disturbance caused by the 2014 series of severe winter storms, which underlines the major role of local hydrodynamics in controlling long-term temporal changes in WGMP benthic macrofauna compositions. The comparison with the RRP highlighted major discrepancies between the two systems in the main processes (i.e., hydrodynamics versus river hydrological regime) controlling surface sediment characteristics and benthic macrofauna compositions, which further supports RiOMar typologies derived from meta-analyses mainly achieved on tropical and subtropical systems. |
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