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Auteur (up) Soissons, L.M.; da Conceicao, T.G.; Bastiaan, J.; van Dalen, J.; Ysebaert, T.; Herman, P.M.J.; Cozzoli, F.; Bouma, T.J. doi  openurl
  Titre Sandification vs. muddification of tidal flats by benthic organisms: A flume study Type Article scientifique
  Année 2019 Publication Revue Abrégée Estuar. Coast. Shelf Sci.  
  Volume 228 Numéro Pages Unsp-106355  
  Mots-Clés arenicola-marina; Benthic organisms; cerastoderma-edule bioturbation; Cerastorderma edule; community structure; erosion; impact; intertidal flat; lanice-conchilega; model; Ruditapes philippinarum; sediment erodability; Sediment properties; Silt content; Suspended sediment concentration; Tidal flats; wadden sea  
  Résumé Bioturbating benthic organisms have typically been characterised by how they modify the vertical sediment erosion thresholds. By means of several annular flume experiments, we aimed to understand how benthic organisms may affect grain-size sediment properties over time, and how this depends on the sediment type and the sediment loading of the water column. We compared the effect of two bioturbating macroinvertebrate species: a local dominant species, the cockle Cerastoderma edule and a spreading non-indigeneous species, the clam Ruditapes philippinarum. Our results indicate that the effect of benthic organisms on sediment dynamics is strongly dependent on both the prevailing environmental conditions and the benthic species present. If sediment is sandy, the benthos can gradually enhance the silt content of the sediment by mixing in part of the daily tidal sediment deposition. In contrast, if sediment is muddy, benthos can gradually decrease the silt content of the sediment by specifically suspending the fine fraction. Moreover, we observed that the native cockles had a stronger impact than invasive clams. Therefore, bioturbating benthos can have an important effect in determining the local sediment properties, with the outcome depending both on the species in question and the environmental conditions the bioturbator lives in. Our findings show that sediment bioturbation may have strong implications for tidal flat stability undergoing major changes from natural or anthropogenic sources.  
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  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0272-7714 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000496611500001 Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2662  
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