Chlorophyll a concentration as an index of sediment surface stabilisation by microphytobenthos?

Riethmüller, Rolf; Heineke, Martina; Kühl, Heinrich; Keuker-Rüdiger, R.

doi:10.1016/s0278-4343(00)00027-3

Cited by 92 publications

(45 citation statements)

References 22 publications

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“…Different macrofaunal assemblages are known to affect sediment stability in different ways (Meadows et al, 1990;Blanchard et al, 1997;Meadows et al, 1998;Widdows et al, 1998bWiddows et al, , 2000Willows et al, 1998;Austin et al, 1999;Riethmüller et al, 2000;Andersen, 2001;de Deckere et al, 2001). For example, on Eden Grid A, N. diversicolor had a net positive association with sediment stability, possibly due to the secretions produced during burrow formation and increased drainage of the sediment.…”

Section: Discussionmentioning

confidence: 99%

“…In past studies, chlorophyll-a was found to be an important variable correlating with sediment stability Riethmüller et al, 1998;Austin et al, 1999;Riethmüller et al, 2000;Defew et al, in press). However, the relationships detected are often weak, suggesting that important interactions are being missed.…”

Section: Introductionmentioning

confidence: 96%

“…This paper investigates some of the factors that influence the stability of intertidal surface sediment through field investigations designed to maintain the natural condition of the sediment. Riethmüller et al (2000) have suggested that variation in sediment stability cited in the literature might reflect site-specific differences and this hypothesis is examined by investigating four estuarine mudflats, covering a broad range of conditions, species composition and local features.…”

Section: Introductionmentioning

confidence: 99%

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Site-specific features influence sediment stability of intertidal flats

Defew

Tolhurst

Paterson

2002

Hydrol. Earth Syst. Sci.

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The factors that influence the sediment stability and the transport of estuarine mudflats are not yet fully understood but knowledge of them is essential in coastal engineering applications and pollution ecology studies. The suggestion that variation in predictive models of sediment stability might be due to site-specific characteristics is investigated using data from four estuarine mudflats (Eden Estuary, Scotland, the Biezelingsche Ham, Zandkreek, and Molenplaat mudflats in The Netherlands). These estuaries differ in their environmental conditions, macrofaunal species composition and local features (e.g. Enteromorpha mats, migratory biofilms). Stable and unstable sediments were compared, and mean chlorophyll-a concentrations and granulometry of the sediments were significantly different between the two groups.Step-wise multiple linear regressions were applied to the sediment stability data of all sites to establish the influences on erosion threshold of microphytobenthic biomass, water content, granulometry, organic carbon content and the abundance of dominant macrofaunal species. The stability of each site was influenced by different factors. Sediment stability of the Eden Estuary was affected by the Enteromorpha bloom; Biezelingsche Ham was influenced by the highly migratory nature of the diatom biofilms and the abundance of Corophium volutator; the polychaete worm Arenicola marina had a net negative effect on sediment stability of the Zandkreek; and the Molenplaat was influenced by microphytobenthic biomass. This research highlights the need for site-specific calibration of models and suggests that a universal proxy parameter for sediment stability is unlikely to be obtained.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Site-specific features influence sediment stability of intertidal flats

Defew

Tolhurst

Paterson

2002

Hydrol. Earth Syst. Sci.

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“…mussel beds) or by binding it by roots. Biostabilization can also result from extracellular polymeric substances (EPS) excreted by diatoms that cohere sediment (Austen et al, 1999;De Brouwer et al, 2000;Decho, 2000;Paterson et al, 2000;Riethmu¨ller et al, 2000). During a bloom period in spring, large amounts of diatoms are known to form diatom mats, which are sometimes visible as a brownish jelly-like layer on the sediment Widdows et al, 2000b).…”

Section: Biostabilization and Biodestabilizationmentioning

confidence: 99%

Biological influences on morphology and bed composition of an intertidal flat

Paarlberg

Knaapen

Vries

et al. 2005

Estuarine, Coastal and Shelf Science

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Biological activity is known to influence sediment strength at bedewater interfaces. However, its precise effect on geomorphology and on bed composition is not known. This paper proposes a parameterization of sediment destabilizing and stabilizing organisms on three parameters that describe the erosion and mixing processes of the sediment bed, namely the critical bed shear stress, the erosion coefficient and the bioturbation coefficient. This parameterization is included in a 3D sandemud morphodynamic model to form the sandemudebio model. The performance of the sandemudebio model is demonstrated by testing it on the Paulinapolder intertidal flat in the Western Scheldt estuary of The Netherlands. Model results show that biological influences on sediment strength result in significant morphological change and bed composition variations. Destabilizing organisms always cause a significant decrease in mud content in the bed and an increase of erosion. On the other hand, stabilizing organisms can, but do not necessarily, cause an increase of mud content and additional sedimentation.

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“…After its resuspension by turbulence and shear stresses generated by tidal currents or wind waves, it may represent up to 50% of the microalgae present in the water column (De Jonge & Van Beusekom 1992) and thus also contribute to the diet of suspension feeders (Riera & Richard 1996. Moreover, microphytobenthos, in producing extracellular polymeric substances (EPS) and forming biofilms at the sediment surface at low tide, acts as an agent of biogenic stabili-sation and influences its own resuspension and the turbidity of the water column (Riethmüller et al 2000, Paterson & Hagerthey 2001.…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal changes in microphytobenthos structure analysed by pigment composition in a macrotidal flat (Bourgneuf Bay, France)

Méléder¹,

Barillé²,

Rincé³

et al. 2005

Mar. Ecol. Prog. Ser.

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The aim of this study was to contribute to a better understanding of turbid coastal ecosystems, focusing on spatio-temporal changes at the mesoscale in microphytobenthos structures in a macrotidal bay (Bourgneuf, France). This was based on pigment analysis by high-pressure liquid chromatography (HPLC), reinforced by microscopy observations, in relation to sediment characteristics. Microphytobenthos assemblages of this mudflat were 97% dominated by diatoms, confirmed by HPLC analysis, which showed biomarker pigments of this group: chlorophyll c, fucoxanthin, diadinoxanthin and diatoxanthin. The main assemblage is constituted of epipsammic species, like Plagiogrammopsis, Achnanthes and Cocconeis, characterising mixed sediments. However, this could be replaced by epipelic species, like Plagiotropis, Pleurosigma and Staurophora, during summer due to station silting. Microphytobenthic photosynthetic active biomass in the first 2 mm varied spatially and temporally from 12.2 to 186.9 mg chl a m -2. The predominance of a biomass spatial variability reflected spatial changes in sediment grain size and water content. Biomass in the first 2 mm represented from 28 to 68% of the total amount in the first 10 mm. This indicated an accumulation of biomass in illuminated layers and a biomass decrease with depth associated with increasing values of the ratio of phaeopigments a and fucoxanthin to chlorophyll a (phaeo a/chl a and fuco/chl a). Both could exceed 1.00 in deeper layers. Temporal changes in microphytobenthos structure at the mesoscale were mainly linked to hydrodynamism. This is stronger in winter and responsible for allochthonous pigment input (lutein and phaeophytin b) and sediment mixing, as grazing activity by macro-and meiofauna, forming chlorophyll a breakdown products, is responsible for an increase in fuco/chl a and phaeo a/chl a values during spring/summer. KEY WORDS: Microphytobenthos · Diatoms · Pigments · High-pressure liquid chromatography · HPLC · GranulometryResale or republication not permitted without written consent of the publisher

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Chlorophyll a concentration as an index of sediment surface stabilisation by microphytobenthos?

Cited by 92 publications

References 22 publications

Site-specific features influence sediment stability of intertidal flats

Site-specific features influence sediment stability of intertidal flats

Biological influences on morphology and bed composition of an intertidal flat

Spatio-temporal changes in microphytobenthos structure analysed by pigment composition in a macrotidal flat (Bourgneuf Bay, France)

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