Expected changes in the benthic fauna of Wadden Sea tidal flats as a result of sea-level rise or bottom subsidence |
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| Institution: | 1. MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Palavas-les-Flots, France;2. CAPES Foundation, Ministry of Education of Brazil, Brasília, DF 70040-020, Brazil;3. Université de Lille, Université Littoral Côte d''Opale, CNRS, Laboratoire d''Océanologie et Géosciences (UMR 8187 LOG), Station Marine de Wimereux, F-59000 Lille, France;4. MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France;1. Univ. Lille, CNRS, UMR 8198 - Evo-Eco-Paleo, SPICI group, F-59000 Lille, France;2. Univ. Lille, CNRS, UMR 8187 - Laboratoire d''Océanologie et de Géosciences (LOG), Station marine de Wimereux, 28 Avenue Foch 62930, Wimereux, France;3. Sorbonne Universités, Université Paris 06, UFR927, 5 place Jussieu, Paris 75005, France;4. Univ. Lille, CNRS, UMR 8516 - Unité LASIR, F-59000 Lille, France;5. Sorbonne Universités, Univ Paris 06, UMR CNRS MNHN 7208 Biologie des Organismes Aquatiques et Écosystèmes (BOREA), Équipe Adaptation aux Milieux Extrêmes, 7 Quai St Bernard, 75005 Paris, France;1. MARE – Marine and Environmental Sciences Centre, ESTM – School of Tourism and Maritime Technology, Polytechnic of Leiria, Peniche 2520-641, Portugal;2. FCTUC - Faculty of Sciences and Technology, University of Coimbra, Coimbra 3000-456, Portugal;3. MARE – Marine and Environmental Sciences Centre, Department of Life Sciences, University of Coimbra, Coimbra 3000-456, Portugal |
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| Abstract: | In different parts of the Dutch Wadden Sea, relationships between intertidal level and abundance of marine macrozoobenthos were similar. Numerical densities, biomass and species richness increased from values close to 0 at the high-water level to maximum values around mean-tide level (numbers) or halfway between this level and low-tide level (biomass). Species richness hardly declined below mean-tide level, whereas mean weight per individual continued to increase from high- to low-water level.Biomass was about 45 g ash-free dry weight per m2 at its maximum and declined in an approximately linear way to values close to 0 at the high-water level and to about 7 g per m2 at the low-water level. These two linear relationships were used to predict biomass changes on intertidal flats of the Wadden Sea at various scenarios of sea-level rise and bottom subsidence. Net sea-level rise is expected to result in increased amounts of intertidal zoobenthos in areas with predominantly high tidal flats, but in declines in lower areas. However, such changes will occur only if sea-level rise proceeds too fast to be compensated by extra sedimentation. Bottom subsidence as a consequence of gas extraction is expected to be too small to cause any measurable change in the benthic fauna. |
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