The Wadden Sea squeeze as a cause of decreasing sedimentary organic loading

Delafontaine, M.T.; Flemming, Burghard W.; Mai, Stephan

doi:10.1016/s1568-2692(00)80022-4

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…For example, Cammen ( 1991) reports faster turnover rates of OM in sand flats compared to mud flats. In the German Wadden Sea, this is consistent with the former showing high mass turnover rates of sand, mud as well as POC Delafontaine et al, 2000a), and the higher POC enrichment of the mud fractions at these sandier sites (Delafontaine et al, 2000b). It would, however, be inappropriate to assume continuous gradients in OM cycling between sand flats and mud flats.…”

Section: Implications For Organism-sediment Interactionssupporting

confidence: 83%

Large-scale trends in some mass physical properties of Danish Wadden Sea sediments, and implications for organism-sediment interactions

Delafontaine¹,

Flemming

Thimm

2004

Geografisk Tidsskrift-Danish Journal of Geography

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Mass physical properties (wet/dry bulk densities, mud/sand contents and concentrations, water content, shear strength) were determined on 132 surficial sediment samples from intertidal flats in Ho Bugt and north of Langli Island between the Hjerting L¢b tidal channel and the Skallingen Peninsula, Danish Wadden Sea. Except for shear strength, all parameters were jiJUnd to be highly intercorrelated (r>0.97), and the 12 equations thus generated can be used conveniently for regional modelling purposes. Investigations which rely on small sample numbers can be optimised by prior pilot studies in which average conditions are defined along environmental gradients and, once suitable in-situ calibrations have been performed, the method can be expanded to other parameters. Water content is a particularly useful predictor because it is a universal master variable by which differences in compaction between different environments can be normalised. Shear strength values show large variations at low mud contents, which decrease sharply towards higher mud contents. Nevertheless, shear strength appears to decrease with increasing mud content, a trend observed in spatial plots of comparative data from the German Wadden Sea. This suggests that the data comprise both spatially coherent and incoherent

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Section: Implications For Organism-sediment Interactionssupporting

confidence: 83%

Large-scale trends in some mass physical properties of Danish Wadden Sea sediments, and implications for organism-sediment interactions

Delafontaine¹,

Flemming

Thimm

2004

Geografisk Tidsskrift-Danish Journal of Geography

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“…Century-long diking activities and land reclamation have resulted in an overall paucity of true mudflats in the region (sediments with mud contents exceeding 95%; mud= <63 μm fraction), and a dominance of sand flats (mud contents of <5%) and so-called mixed flats (for various sediment classification schemes, see Flemming 2000). The effects of this Wadden Sea squeeze (Delafontaine et al 2000;Mai and Bartholomä 2000) are less pronounced in protected embayments (e.g. Jade Bay) that can accommodate finegrained sediment deposition, and in tidal flats nourished by estuarine silts and clays (e.g.…”

Section: Study Areasmentioning

confidence: 99%

228Ra, 226Ra, 224Ra and 223Ra in potential sources and sinks of land-derived material in the German Bight of the North Sea: implications for the use of radium as a tracer

et al. 2011

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“…Embanking muddy coastal inlets and the nearshore mud belt removed fine particles from the sediment budget. Calculations for two tidal basins suggest that the amount of mud lost by land reclamation exceeds the amount still present by a factor of 4-5 (Delafontaine et al 2000).…”

Section: Saltmarsh Workmentioning

confidence: 96%

Coast of change: habitat loss and transformations in the Wadden Sea

Reise

2005

Helgol Mar Res

111

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In the southern North Sea, coastal people commenced with habitat conversions 1,000 years ago. Partly interrupted in late medieval times by large-scale inundations of marshland, progressive embankments transformed the landward half of the amphibic transition zone between a limno-terrestric and a brackishmarine ecosystem into arable land and freshwater lakes. Sea walls rigidly separated the land from the sea. Dynamic transitional habitats have vanished. Areal loss has diminished the capacity of the Wadden Sea to dissipate wave and tidal energy. A coastal ecosystem once rich in marsh plants, seagrass and diatoms on mud flats became transformed into one with less autochthonous phototroph production, dominated by sandy tidal flats, and dependent primarily on allochthonous plankton supply. The large estuaries have been dredged to serve as shipping canals, and have lost most of their former retention and filter capacity. Riverine loads are now flushed right into the North Sea. Symptoms of a syndromatic coastal habitat degradation are diagnosed, leading to a decline in natural habitat diversity. The conventional on-line coastal protection may not achieve a sustainable coastal habitat configuration. At sedimentary coasts immobilised by dikes and petrified shores, a more flexible response to sea level rise is recommended.

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The Wadden Sea squeeze as a cause of decreasing sedimentary organic loading

Cited by 7 publications

References 13 publications

Large-scale trends in some mass physical properties of Danish Wadden Sea sediments, and implications for organism-sediment interactions

Large-scale trends in some mass physical properties of Danish Wadden Sea sediments, and implications for organism-sediment interactions

228Ra, 226Ra, 224Ra and 223Ra in potential sources and sinks of land-derived material in the German Bight of the North Sea: implications for the use of radium as a tracer

Coast of change: habitat loss and transformations in the Wadden Sea

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