The seasonal dynamics of benthic (micro) organisms and extracellular carbohydrates in an intertidal mudflat and their effect on the concentration of suspended sediment

Deckere, E.M.G.T. de; Kornman, B.A.; Staats, N.; Termaat, G.R.; Winder, Ben de; Stal, Lucas J.; Heip, C.H.R.

doi:10.1016/s1568-2692(02)80031-6

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…A number of secondary linkages, where the phytoplankton bloom can generate other biophysical responses that can affect the stability of the mudflat sediments, must also be considered. Various studies have documented a number of potential mechanisms that can alter sediment stability, such as bioturbation by invertebrates (Palomo and Iribarne, 2000), invertebrate benthic grazing (Gerdol and Hughes, 1994), abiotic effects like subaerial exposure of the mudflat (Amos et al, 1988), the presence of benthic microalgae (Madsen et al, 1993), microbes (Lelieveld et al, 2003), and extracellular carbohydrates (de Deckere et al, 2002). With the extensive mudflats in this region, we must consider that several of these processes may be responsible for the results seen for far south SFB.…”

Section: Future Workmentioning

confidence: 99%

A sediment budget for the southern reach in San Francisco Bay, CA: Implications for habitat restoration

2013

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Section: Future Workmentioning

confidence: 99%

A sediment budget for the southern reach in San Francisco Bay, CA: Implications for habitat restoration

2013

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“…We note that the majority of the fine sediments in the Ems-Dollard estuary are of marine origin, whereas riverine contributions are small, in particular since the erection of Hebrum weir. Currently, the Dollard yields a huge stock of fine sediments, which is remobilized in winter time by waves eroding the sediments from the bed (De Deckere et al 2002) and subsequently arrested on the intertidal areas in early summer by phytoplankton activity. However, as the Dollard is accreting over longer periods of time (Cleveringa 2008), we do not expect that the Dollard yields an important net source for the fine sediments accumulating within the Ems River.…”

Section: The 1dv Point Modelmentioning

confidence: 99%

Fine sediment transport by tidal asymmetry in the high-concentrated Ems River: indications for a regime shift in response to channel deepening

Winterwerp

2010

Ocean Dynamics

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This paper describes an analysis of the observed up-river transport of fine sediments in the Ems River, Germany/Netherlands, using a 1DV POINT MODEL, accounting for turbulence-induced flocculation and sediment-induced buoyancy destruction. From this analysis, it is inferred that the net up-river transport is mainly due to an asymmetry in vertical mixing, often referred to as internal tidal asymmetry. It is argued that the large stratification observed during ebb should be attributed to a profound interaction between turbulence-induced flocculation and sediment-induced buoyancy destruction, as a result of which the river became an efficient trap for fine suspended sediment. Moreover, an asymmetry in flocculation processes was found, such that during flood relative large flocs are transported at relative large flow velocity high in the water column, whereas during ebb, the larger flocs are transported at smaller velocities close to the bedthis asymmetry contributes to the large trapping mentioned above. The internal tidal asymmetry and asymmetry in flocculation processes are both driven by the pronounced asymmetry in flow velocities, with flood velocities almost twice the ebb values. It is further argued that this efficient trapping is the result of a continuous deepening of the river, and occurs when concentrations in the river become typically a few hundred mg/l; this was the case during the 1990 survey analyzed in this paper. We also speculate that a second regime shift did occur in the river when fluid mud layers become so thick that net transport rates are directly related to the asymmetry in flow velocity itself, probably still in conjunction with internal asymmetry as well. This would yield an efficient mechanism to transport large amounts of fine sediment far up-river, as currently observed.

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“…The resulting seasonal filamentous algal and cyanobacterial mats that grow on the intertidal mud surface often produce mucus secretions (Stephens et al 2002;Lelieveld et al 2003). These trap and bind sediment grains and displaced microfossils, which would otherwise probably not be retained in the sediment for long (Stephens et al 2002;de Deckere et al 2003;Lelieveld et al 2003).…”

Section: Increased Abundance Of Displaced Microfossilsmentioning

confidence: 99%

Foraminiferal record of sewage outfall impacts on the inner Manukau Harbour, Auckland, New Zealand

Matthews¹,

Grenfell²,

Hayward³

et al. 2005

New Zealand Journal of Marine and Freshwater Research

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The fossil foraminiferal faunas preserved in intertidal sediment in six cores document the impact of human activities on the ecosystems of the north-east arm of the Manukau Harbour, Auckland, New Zealand. They indicate that Polynesian forest clearance and horticulture had negligible impact on the harbour biota. Before 1960, organic-rich discharges from four large meat works around the head of Mangere Inlet produced changes in nearby foraminiferal faunas but did not affect faunas in the more seaward part of the arm. Initial early European increases in organic nutrients from the meat works resulted in the development of weak hypertrophic zones around the outfalls, characterised by higher absolute abundances of benthic foraminifera and ostracods and possible benthic algal blooms. Higher organic nutrient levels in one core closer to an outfall produced eutrophic and anoxic conditions with no foraminifera (abiotic zone the meat works and other outfalls progressively closed. This change coincided with a sharp increase in zinc (Zn) and lead (Pb) levels in sediments throughout the arm, attributed to a rapid increase in motor vehicle numbers and stormwater run-off. The MSTP discharged vast quantities of nutrient-and mud-rich fresh water into the seaward part of the arm, resulting in an order of magnitude increase in sedimentation rates throughout most of the arm and a widespread change in the foraminiferal faunas. Foraminiferal abundance generally decreased and species diversity increased with the appearance of numerous juvenile foraminiferal shells carried in by the incoming tide from subtidal habitats nearer the harbour mouth. Also appearing in large numbers in the post-1960 sediment are planktic foraminifera, large diatom valves, and sponge sterrasters, all of which are inferred to have been transported in. The sudden increase in displaced microfossils may be a result of a combination of fresh water-induced flocculation and increased "stickiness" of the substrate from the growth of benthic algal mats, resulting from the high nutrient output from the MSTP.

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The seasonal dynamics of benthic (micro) organisms and extracellular carbohydrates in an intertidal mudflat and their effect on the concentration of suspended sediment

Cited by 6 publications

References 22 publications

A sediment budget for the southern reach in San Francisco Bay, CA: Implications for habitat restoration

A sediment budget for the southern reach in San Francisco Bay, CA: Implications for habitat restoration

Fine sediment transport by tidal asymmetry in the high-concentrated Ems River: indications for a regime shift in response to channel deepening

Foraminiferal record of sewage outfall impacts on the inner Manukau Harbour, Auckland, New Zealand

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