Long-term changes of intertidal and subtidal sediment compositions in a tidal basin in the northern Wadden Sea (SE North Sea)

Dolch, Tobias; Hass, Christian

doi:10.1007/s10152-007-0090-7

Cited by 20 publications

(10 citation statements)

References 24 publications

(30 reference statements)

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“…Physical changes were not measured in this study but are summarized here from the literature, and geomorphologic aspects are taken from aerial photographs in Dolch (2008). The shape of Königshafen has changed little over the past century except for the embankment of a salt marsh area in the south in 1937 and a peninsula created by nourished sand 70 years ago (Kolumbe 1932;Newig 1980;Bayerl and Hilgelke 1994).…”

Section: Review Of Physical Changementioning

confidence: 99%

Transitions in sandflat biota since the 1930s: effects of sea-level rise, eutrophication and biological globalization in the tidal bay Königshafen, northern Wadden Sea

2014

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Conspicuous macrozoobenthos and vegetation of intertidal sandflats in Königshafen (Island of Sylt, SE North Sea) were mapped in 1932, 1988 and 2008. Higher water levels since the 1930s with a concomitant increase in tidal dynamics are assumed to have weakened sediment stability. This dissolved the distinctly banded macrobenthic zonation of the 1930s. Near high water level, cyanobacterial mats with associated beetles, belts of the mudshrimp Corophium volutator and the seagrass Zostera noltii have vanished, while the range of the lugworm Arenicola marina has extended towards the shore. Near low water level, sandy elevations have become permanently submerged because a tidal creek has widened its bed. In 1988, extensive green algal mats and the almost complete absence of seagrass are attributed to peak eutrophication. This partially reversed until 2008. The mussel Mytilus edulis had strongly extended its beds along the creek in 1988. These were taken over by introduced Pacific oysters Crassostrea gigas in 2008. Also in 2008, the cordgrass Spartina anglica, another introduced species, grew into large tussocks where cyanobacterial mats and a Corophium-belt had been mapped in the 1930s. Former benthic patterns may have little chance of resurrection by conventional nature protection because these small-scale shifts represent responses to regional and global change.

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Section: Review Of Physical Changementioning

confidence: 99%

Transitions in sandflat biota since the 1930s: effects of sea-level rise, eutrophication and biological globalization in the tidal bay Königshafen, northern Wadden Sea

2014

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“…Conversely, epipelic diatoms and hydrobiid snails grazing upon them are hypothesized to be potential losers together with the feeble intertidal seagrasses. This is supported by a signiWcant long-term depletion of mud caused by the prevailing hydrodynamics (Dolch and Hass 2008).…”

Section: Ecosystem Changementioning

confidence: 99%

Interactive effects of global and regional change on a coastal ecosystem

Reise

Beusekom

2008

Helgol Mar Res

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Shallow waters and lowland meet at the same level in the Wadden Sea, but are separated by walls of coastal defense. What are the prospects of this coastal ecosystem in a warmer world? We focus on tidal waters and inshore sedimentary bottoms, expect nutrient supply from land to decline and species introductions, temperature and sea level to rise. The eVects are interrelated and will have an increasing likelihood of abrupt and irreversible developments. The biotic interactions are hardly predictable but we anticipate the following changes to be more likely than others: blooms of phytoplankton will be weak mainly because of increasing pelagic and benthic grazing pressure, both facilitated by warming. Possibly birds feeding on mollusks will encounter decreasing resource availability while Wsheaters beneWt. Extensive reefs of PaciWc oysters could facilitate aquatic macrophytes. Sea level rise and concomitant hydrodynamics above tidal Xats favor well-anchored suspension feeders as well as burrowing fauna adapted to dynamic permeable sand. With high shares of immigrants from overseas and the south, species richness will increase; yet the ecosystem stability may become lower. We suggest that for the next decades invasions of introduced species followed by warming and declining nutrient supply will be the most pressing factor on the changes in the Wadden Sea ecosystem, and the eVects of sea level rise to be the key issue on the scale of the whole century and beyond.

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“…In the core collected near the creek mouth, the high sand content in the middle section reflects a higher hydrodynamic energy as the grain size of sediment reflects prevailing hydrodynamic condition (Dolch and Hass 2008). Waves and tides associated with currents must have facilitated deposition of coarser sediment fraction carrying away finer sediment component (Siraswar and Nayak 2011).…”

Section: Sediment Components and Organic Carbonmentioning

confidence: 99%

Evaluation of impact of industrial effluents on intertidal sediments of a creek

Volvoikar

Nayak

2013

Int. J. Environ. Sci. Technol.

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A large amount of material in the form of industrial effluents and urban sewage containing metal contaminants directly enters Dudh creek. Metals on entering the creek tend to settle at the bottom and become part of the sediments. The distribution of metals with depth reflects changes in their supply as well as diagenetic modifications with time. In the present study, an attempt has been made to understand the impact of waste discharged from Tarapur Maharashtra Industrial Development Corporation on Dudh creek. Two cores were collected, one close to the creek mouth and the other in the inner part of the creek. Sediment component, organic carbon and metal (vanadium, copper, nickel, lead, zinc, manganese, iron and aluminium) analyses were carried out on the two cores. The variation in the distribution of sediment components with depth reflects changes in hydrodynamic condition of the creek over the years. Increase in concentration of most of the metals in the upper part of the cores indicates additional input in recent years. The core collected in the inner part of the creek showed higher metal and organic carbon concentration as compared to the downstream core. This was very well supported by distribution of points on an isocon plot. Enrichment factor and index of geoaccumulation were used to find the extent of pollution in sediments of the creek. Correlation and R-mode factor analysis have also been computed to understand the association and source of metal input in sediments of Dudh creek.

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Long-term changes of intertidal and subtidal sediment compositions in a tidal basin in the northern Wadden Sea (SE North Sea)

Cited by 20 publications

References 24 publications

Transitions in sandflat biota since the 1930s: effects of sea-level rise, eutrophication and biological globalization in the tidal bay Königshafen, northern Wadden Sea

Transitions in sandflat biota since the 1930s: effects of sea-level rise, eutrophication and biological globalization in the tidal bay Königshafen, northern Wadden Sea

Interactive effects of global and regional change on a coastal ecosystem

Evaluation of impact of industrial effluents on intertidal sediments of a creek

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