The biogeochemistry, stable isotope geochemistry, and microbial community structure of a temperate intertidal mudflat: an integrated study

Böttcher, Michael E.; Hespenheide, Britta; Llobet-Brossa, Enrique; Beardsley, Christine; Larsen, Ole; Schramm, Andreas; Wieland, Andrea; Böttcher, Gerd; Berninger, Ulrike-G.; Amann, Rudolf

doi:10.1016/s0278-4343(00)00046-7

Cited by 105 publications

(89 citation statements)

References 44 publications

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“…Biomass values reported in this study were within the range reported in the literature for intertidal mud-and sand-flats (Lucas et al 1996, Epstein et al 1997, Goñi-Urriza et al 1999, Böttcher et al 2000, Danovaro et al 2001. BB showed a seasonal pattern (Fig.…”

Section: Microphytobenthos and Bacteria Biomasssupporting

confidence: 87%

Factors controlling benthic metabolism during low tide along a granulometric gradient in an intertidal bay (Roscoff Aber Bay, France)

Hubas¹,

Davoult²,

Cariou³

et al. 2006

Mar. Ecol. Prog. Ser.

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Section: Microphytobenthos and Bacteria Biomasssupporting

confidence: 87%

Factors controlling benthic metabolism during low tide along a granulometric gradient in an intertidal bay (Roscoff Aber Bay, France)

Hubas¹,

Davoult²,

Cariou³

et al. 2006

Mar. Ecol. Prog. Ser.

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“…Oxygenated water is advected through sandy, permeable sediments such as those found at NB, and such locations have high rates of aerobic respiration (de Beer et al 2005). In contrast, oxygen penetration in muddy sediments is limited to the top few millimeters (Böttcher et al 2000). Our own measurements with DC sediments verify this generalization (M. R. First & J. T. Hollibaugh unpubl.).…”

supporting

confidence: 54%

“…Thus, factors controlling the abundance of heterotrophic protists have implications for trophic efficiency and overall benthic metabolism. Physical and chemical characteristics of the sediments, such as oxygen penetration, can constrain the abundance of protists (Fenchel 1968, Fenchel & Bernard 1996, Böttcher et al 2000. Topdown predation and advection or migration out of the system (e.g.…”

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

Environmental factors shaping microbial community structure in salt marsh sediments

First

Hollibaugh²

2010

Mar. Ecol. Prog. Ser.

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We examined benthic microbial communities in 3 contrasting subtidal salt marsh sediments over the course of a year to investigate the relationship between environmental conditions and benthic microbial community structure. Samples were collected monthly from a high-energy sandy beach, a tidal creek bed, and a Spartina alterniflora marsh border. The concentrations and biomasses of benthic microalgae (BMA), total and potentially active bacteria (measured by an enzyme-activated fluorogenic compound), heterotrophic protists, and metazoan meiofauna were measured at each location. Sediment grain size and porewater pH explained most of the variability in biomass distributions; variations in benthic biomass did not correlate well with temperature. There was a seasonal shift from a BMA-dominated community in the spring and summer months to bacteria-dominated communities in autumn at all locations, when inactive bacteria were most abundant. When normalized to sediment porewater volume, benthic protists concentrations were not significantly related to sediment porosity. Benthic protist porewater concentrations (mean: 3.4 × 10 3 , range: 0.1 to 9.3 × 10 3 protists ml -1) were comparable to protist concentrations in the water column. In contrast, bacteria were several orders of magnitude more concentrated in the sediments (mean: 4.2 × 10 9 ; range: 0.6 to 16 × 10 9 bacteria ml -1 ) than the water column. Low abundances of protists relative to bacteria appear to contribute to long bacterial turnover times, especially in fine-grained sediments. We hypothesize that both grazing by meiofauna and low anaerobic growth efficiency lead to relatively low biomass of bacterivorous protists. KEY WORDS: Marine sediments · Salt marsh · Microzoobenthos · Protists · Bacteria · Biomass Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 399: [15][16][17][18][19][20][21][22][23][24][25][26] 2010 derived carbon appeared in meiofauna within 1 h of the addition of 13 C bicarbonate; bacteria incorporated the labeled carbon within several hours (Middelburg et al. 2000). These and other observations suggest that algal-derived carbon is channeled through 2 discrete pathways: (1) directly to herbivorous metazoan meiofauna, or (2) through bacteria to the microbial food web (van Oevelen et al. 2006). However, exchanges between these trophic pathways also occur. For example, diatoms were ingested by both protists and meiofauna (Epstein 1997a) and ingestion of bacteria by meiofauna and microinvertebrates has been observed (Kemp 1987). Additionally, the linkages between bacterivorous microbenthos and meiofauna (Epstein & Gallagher 1992, Hamels et al. 2001a) indicate that the 2 major routes of carbon flow in benthic environments, at least at times, intersect.The processes regulating the abundance and activity of bacteria in sediments are especially important as sediment bacteria play a significant role in benthic metabolism and geochemistry by transforming carbon, nitrogen, and sulfur compounds (revi...

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“…The studies focused on surface sediments (e.g. Böttcher et al, 2000;Llobet-Brossa et al, 2002;Billerbeck et al, 2006;Al-Raei et al, 2009;Jansen et al, 2009) as well as on deeper sediment layers down to 5 m below the seafloor (mbsf) (e.g. Köpke et al, 2005;Wilms et al, 2006b;Beck et al, 2008b;Gittel et al, 2008;Røy et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Imprint of past and present environmental conditions on microbiology and biogeochemistry of coastal Quaternary sediments

et al. 2011

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Abstract. To date, North Sea tidal-flat sediments have been intensively studied down to a depth of 5 m below seafloor (mbsf). However, little is known about the biogeochemistry, microbial abundance, and activity of sulfate reducers as well as methanogens in deeper layers. In this study, two 20 m-long cores were retrieved from the tidal-flat area of Spiekeroog Island, NW Germany. The drill sites were selected with a close distance of 900 m allowing to compare two depositional settings: first, a paleo-channel filled with Holocene sediments and second, a mainly Pleistocene sedimentary succession. Analyzing these cores, we wanted to test to which degree the paleo-environmental imprint is superimposed by present processes.In general, the numbers of bacterial 16S rRNA genes are one to two orders of magnitude higher than those of Archaea. The abundances of key genes for sulfate reduction and methanogenesis (dsrA and mcrA) correspond to the sulfate and methane profiles. A co-variance of these key genes at sulfate-methane interfaces and enhanced ex situ AOM rates suggest that anaerobic oxidation of methane may occur in these layers. Microbial and biogeochemical profiles are vertically stretched relative to 5 m-deep cores from shallower sediments in the same study area, but still appear compressed compared to deep sea sediments. Our interdisciplinary analysis shows that the microbial abundances and metabolic rates are elevated in the Holocene compared to Pleistocene sediments. However, this is mainly due to present environmental Correspondence to: M. Beck (m.beck@icbm.de) conditions such as pore water flow and organic matter availability. The paleo-environmental imprint is still visible but superimposed by these processes.

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The biogeochemistry, stable isotope geochemistry, and microbial community structure of a temperate intertidal mudflat: an integrated study

Cited by 105 publications

References 44 publications

Factors controlling benthic metabolism during low tide along a granulometric gradient in an intertidal bay (Roscoff Aber Bay, France)

Factors controlling benthic metabolism during low tide along a granulometric gradient in an intertidal bay (Roscoff Aber Bay, France)

Environmental factors shaping microbial community structure in salt marsh sediments

Imprint of past and present environmental conditions on microbiology and biogeochemistry of coastal Quaternary sediments

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