Kinetics of tidal resuspension of microbiota:testing the effects of sediment cohesiveness and bioturbation using flume experiments

Blanchard, G.F.; Sauriau, Pierre-Guy; Gall, V. Cariou-Le; Gouleau, Dominique; Garet, MJ; Olivier, Frédéric

doi:10.3354/meps151017

Cited by 60 publications

(42 citation statements)

References 17 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%

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%

Site-specific features influence sediment stability of intertidal flats

Defew

Tolhurst

Paterson

2002

Hydrol. Earth Syst. Sci.

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“…The common mud snail Hydrobia ulvae is a widespread deposit feeder at fine-grained sediments on European intertidal flats and an evaluation of the effect of this species on the erodibility of the bed is therefore of major importance. The snail may occur in densities of up to about 300 000 individuals m À 2 (Blanchard et al, 1997;Austen et al, 1999;Jensen, 1992;Lillebø et al, 1999). Some studies (Blanchard et al, 1997;Andersen, 2001a) have indicated that H. ulvae increase the erodibility of their substrata.…”

Section: Introductionmentioning

confidence: 99%

“…The snail may occur in densities of up to about 300 000 individuals m À 2 (Blanchard et al, 1997;Austen et al, 1999;Jensen, 1992;Lillebø et al, 1999). Some studies (Blanchard et al, 1997;Andersen, 2001a) have indicated that H. ulvae increase the erodibility of their substrata. Not only do the snailshells themselves increase the roughness of the bed, but so does the surface tracking caused by the feeding activity of the snails (Blanchard et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Some studies (Blanchard et al, 1997;Andersen, 2001a) have indicated that H. ulvae increase the erodibility of their substrata. Not only do the snailshells themselves increase the roughness of the bed, but so does the surface tracking caused by the feeding activity of the snails (Blanchard et al, 1997). Additionally, faecal pellets egested by the snails are easily eroded, and as more than 80% (by weight) of the topmost 5 mm of the bed at intertidal mudflats may consist of such pellets, it may be a significant factor in mediating erodibility (Andersen, 2001a).…”

Section: Introductionmentioning

confidence: 99%

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Enhanced erodibility of fine-grained marine sediments by Hydrobia ulvae

Andersen

Jensen

Lund-Hansen

et al. 2002

Journal of Sea Research

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The common mud snail Hydrobia ulvae is a widespread and dominant deposit feeder on fine-grained substrata along the European Atlantic coastline. Previous studies have shown that mud snail activities such as grazing, faecal pellet production and mucous production may influence physical properties of the surface sediment layer and thus depositional and erosional processes. To quantify the influence of Hydrobia density on key parameters such as erosion threshold and erosion rate, a shortterm laboratory experiment was conducted. Snails were placed on fine-grained sediment at densities of 10 000 and 50 000 ind m À 2 and erosion experiments were carried out one, three and five days after establishment of the sediment beds. Controls without H. ulvae were treated the same way. The presence of H. ulvae significantly increased the erosion rate and decreased the erosion threshold compared to snail-free control plots. The erosion rate was increased by a factor of 2 to 4 when H. ulvae were present and showed stronger influence by the snail than the erosion threshold. Snail density did not affect the erosion threshold, but the erosion rate doubled with an increase in density from 10 000 to 50 000 ind m À 2 . The erosion rate was only marginally different after one day but the difference increased over time and the erosion rate was significantly different for all treatments after five days. No significant time dependence was observed for the erosion threshold. The results generally confirm results obtained in situ and differences can be related to different hydrodynamic conditions under field and laboratory conditions. D

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“…Furthermore, small benthic faunal (e.g. the gastropod Hydrobia ulvae) may disturb the sediment surface by creating tracks and forming faecal aggregates that, together with the animal itself, increases the overall bed roughness, making the surface more susceptible to hydrodynamic erosive forces (Blanchard et al, 1997;. Also sediment reworking by larger burrowing and deposit-feeding macrofauna (e.g.…”

Section: Introductionmentioning

confidence: 99%

Influence of benthic macroinvertebrates on the erodability of estuarine cohesive sediments: Density- and biomass-specific responses

Kristensen

Neto

Lundkvist

et al. 2013

Estuarine, Coastal and Shelf Science

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Regional index term: Portugal Mondego EstuaryKeywords: erosion threshold erosion rate behaviour macrofauna feeding microphytobenthos biostabilization a b s t r a c tThe impact of three dominating benthic invertebrates on sediment stability and erosion conditions of cohesive sediments in the Mondego Estuary, Portugal, was examined in laboratory annular flume experiments. The purpose was to test how the life habits and body size of the three involved species (Hydrobia ulvae, Nereis diversicolor and Scrobicularia plana) in terms of density or biomass influence sediment erosion. All three species decreased the free-stream erosion threshold (u c ) and increased erosion rate (E), since their feeding activities diminished the surface stabilizing effect of extracellular polymeric substances (EPS) produced by microphytobenthos. S. plana had the highest and H. ulvae the lowest impact when related to density (factor of 29 for u c and factor of 19 for E), while H. ulvae was more important than S. plana when related to biomass (factor of 4 for u c and factor of 6 for E). N. diversicolor had intermediate density-specific (4e6 times higher than H. ulvae) and lowest biomass-specific (2e3 times lower than S. plana) effects on erosion. It appears that faunal erosion impacts preferably should be reported in biomass units for comparative purposes because individual behavioural effects of a smallbodied species like H. ulvae functionally can be relatively more important than those of a 100 times heavier S. plana individual. This is clearly evidenced from the strongly diminished response in suspended Chlorophyll-a content in the presence of the former than the latter species, which is caused by an efficient microphytobenthos grazing by H. ulvae. It is also important to emphasize that the total faunal impact on erosion threshold in a certain area is dictated by combination of contributions from individual species. The total outcome is unpredictable and controlled by synergistic and antagonistic speciesspecific effects, species interactions as well as environmental and sediment conditions.

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Kinetics of tidal resuspension of microbiota:testing the effects of sediment cohesiveness and bioturbation using flume experiments

Cited by 60 publications

References 17 publications

Site-specific features influence sediment stability of intertidal flats

Site-specific features influence sediment stability of intertidal flats

Enhanced erodibility of fine-grained marine sediments by Hydrobia ulvae

Influence of benthic macroinvertebrates on the erodability of estuarine cohesive sediments: Density- and biomass-specific responses

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