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Sediment segregation by biodiffusing bivalves Montserrat, F.; Van Colen, C.; Provoost, P.; Milla, B.; Ponti, M.; Van den Meersche, K.; Ysebaert, T.J.; Herman, P.M.J. (2009). Sediment segregation by biodiffusing bivalves. Est., Coast. and Shelf Sci. 83(4): 379-391. https://dx.doi.org/10.1016/j.ecss.2009.04.010 In: Estuarine, Coastal and Shelf Science. Academic Press: London; New York. ISSN 0272-7714; e-ISSN 1096-0015, meer Is gerelateerd aan: Montserrat, F.; Van Colen, C.; Provoost, P.; Milla, B.; Ponti, M.; Van den Meersche, K.; Ysebaert, T.J.; Herman, P.M.J. (2009). Sediment segregation by biodiffusing bivalves, in: Van Colen, C. Tidal flat macrobenthos ecology, recolonisation and succession = Ecologie, herkolonisatie en successie van het macrobenthos in slikken. pp. 145-174, meer

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 152137 [ download pdf ]

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Trefwoorden

Cohesive sediment Deposition Erosion Image analysis Intertidal flats Sand Sediment mixing > Bioturbation Sediments > Clastics > Mud Sediments > Cohesive sediments ANE, Nederland, Westerschelde, PaulinaPolder Marien/Kust

Author keywords

intertidal; cohesive; sediment; sand; mud; erosion; deposition; luminophores; image analysis; bioturbation; ecosystem engineering; Ecosystem engineering; Intertidal; Intertidaal; Luminophores; Ecosystem engineering; Intertidal; Intertidaal; Luminophores

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Auteurs		Top
Montserrat, F., meer Van Colen, C., meer Provoost, P., meer Milla, B.	Ponti, M. Van den Meersche, K., meer Ysebaert, T.J., meer Herman, P.M.J., meer

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Abstract

The selective processing of sediment fractions (sand and mud; > 63 µm and = 63 µm median grain size) by macrofauna was assessed using two size classes of inert, UV-fluorescent sediment fraction tracers (luminophores). The luminophores were applied to the sediment surface in 16 m2 replicated plots, defaunated and control, and left to be reworked by infauna for 32 days. As the macrofaunal assemblage in the ambient sediment and the control plots was dominated by the common cockle Cerastoderma edule, this species was used in an additional mesocosm experiment. The diversity, abundance and biomass of the defaunated macrobenthic assemblage did not return to control values within the experimental period. Both erosion threshold and bed elevation increased in the defaunated plots as a response to the absence of macrofauna and an increase in microphytobenthos growth. In the absence of macrobenthos, we observed an accretion of 7 mm sediment, containing ca. 60% mud. Image analysis of the vertical distribution of the different luminophore size classes showed that the cockles preferentially mobilised fine material from the sediment, thereby rendering it less muddy and effectively increasing the sand: mud ratio. Luminophore profiles and budgets of the mesocosm experiment under “no waves-no current” conditions support the field data very well.

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