Uncoupling of bacterial production and flagellate grazing in aquatic sediments: a case study from an intertidal flat

Hamels, Ilse; Muylaert, Koenraad; Casteleyn, Griet; Vyverman, Wim

doi:10.3354/ame025031

Cited by 45 publications

(28 citation statements)

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“…This generalization is restricted to coastal and intertidal sediments and may not hold for deep-sea sediments due to the limited availability of nitrogen resources (Jumars et al 1990). For the present study site, we estimate that 30% of the bacterial production was grazed, 1-2% by microbenthos (1.1 mmol C m 22 d 21 , from Hamels et al 2001), 3% by meiobenthos (this study), and 24% by macrobenthos (this study). As meiobenthic and macrobenthic biomass at our study sites are high as compared with other coastal and intertidal sediments (Heip et al 1995), we assert that bacterivory is comparatively intense at our study site.…”

Section: Discussionmentioning

confidence: 77%

“…The significance and efficiency of this loop has focused on a link or sink debate: Is bacterial production a carbon link or sink in the food web? The intractable benthic environment has made experimental studies difficult and studies therefore have tended to focus on a subset of potential grazers, such as heterotrophic flagellates (Hamels et al 2001), meiobenthos (Montagna 1993), or macrobenthic species (Kemp 1987). These studies revealed that 1-20% of the bacterial production is grazed.…”

Section: Discussionmentioning

confidence: 99%

“…Methodological advances have been made, such as the use of fluorescent-stained sediment (Starink et al 1994) and radioactively labeled substrates (Montagna 1993). Using these methods, quantitative data on bacterivory by smallsized grazers have been gathered (Epstein and Shiaris 1992;Hamels et al 2001). In general, only 1-20% of the bacterial production is observed to be grazed, although grazing intensity may fluctuate seasonally (Hamels et al 2001).…”

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confidence: 99%

“…Using these methods, quantitative data on bacterivory by smallsized grazers have been gathered (Epstein and Shiaris 1992;Hamels et al 2001). In general, only 1-20% of the bacterial production is observed to be grazed, although grazing intensity may fluctuate seasonally (Hamels et al 2001). Grazing studies are generally focused on the top centimeter of the sediment and are based on comparatively short time incubations (minutes to hours) in retrieved and/or slurried sediments, rendering translation to the field and longer periods cumbersome.…”

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confidence: 99%

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The fate of bacterial carbon in an intertidal sediment: Modeling an in situ isotope tracer experiment

et al. 2006

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We report the results of an integrated modeling and in situ isotope tracer experiment study examining the fate of bacterial carbon in an intertidal sediment. 13 C-glucose was injected into the upper 10 cm of an intertidal sediment, which successfully tagged the bacterial community as evidenced by 13 C enrichment of bacterial specific polar-lipid-derived fatty acids. Over a period of 4.5 months, 13 C enrichment was monitored in sediment organic carbon, bacteria, meiobenthos, macrobenthos, and dissolved inorganic carbon. A mechanistic model accurately simulated label transfer among the biotic and abiotic compartments and was used to derive bacterial production and the loss processes grazing, mortality, respiration, and exchange. Bacterial production averaged 67 mmol C m 22 d 21 , of which 8% was lost from the sediment by exchange processes, 3% was grazed by meiobenthos and 24% by macrobenthos. The primary fate of bacterial production was mortality (65%) and the released bacterial carbon was recycled back to dissolved organic carbon, resulting in recycling of carbon within the dissolved organic carbon-bacteria loop. Bacterial respiration was the main loss process from this loop. Although a significant fraction of bacterial carbon production was grazed, our results show that bacterial carbon is primarily a sink of organic carbon in the food web of intertidal sediments.

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Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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The fate of bacterial carbon in an intertidal sediment: Modeling an in situ isotope tracer experiment

et al. 2006

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“…Colijn & Dijkema, 1981;Sundba¨ck, 1984;de Jong & de Jonge, 1995;Hamels et al, 2001) was found in the Soltho¨rn tidal flat. The highest mean value in the present study was 198.9 mg chl a m À2 , which ranks in the middle to upper range for intertidal sediments (Colijn & de Jonge, 1984;MacIntyre et al, 1996).…”

Section: à2mentioning

confidence: 99%

Microphytobenthic dynamics in a Wadden Sea intertidal flat – Part II: Seasonal and spatial variability of non-diatom community components in relation to abiotic parameters

Scholz

Liebezeit

2012

European Journal of Phycology

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The microphytobenthos colonizing the intertidal flats forms an important component of the Wadden Sea. Ten sampling points along a 1-km transect were studied in a fringe area of the Soltho¨rn tidal flat, southern North Sea, in order to determine seasonal differences in the microphytobenthos. An accompanying paper deals with the major component of the flora, the diatoms; here we, focus on the minor taxonomic groups. From May 2008 to May 2009 surface sediments were collected during low tide. Variation of environmental factors as well as microphytobenthic density (abundance and chlorophyll a) were monitored. The area investigated was a mixed-sediment mudflat, with a gradient from coarse to fine. Highest biomass was obtained in summer 2008 with 215.9 AE 12.6 mg chlorophyll a m -2 . In late autumn the chlorophyll a concentration decreased continuously at all investigated stations. Lowest values were detected in December 2008. Species abundances varied considerably both along the transect and seasonally, depending on species-specific requirements as well as hydrodynamic conditions (tidal currents). Higher densities of benthic pro-and eukaryotic microalgae were observed in sites characterized by fine sediments. Apart from the diatoms, the most abundant microphytobenthic group was the cyanophytes. Coccoid cyanophytes, mainly Merismopedia sp., were most abundant during summer, with cell numbers up to 5.72 Â 10 6 cells cm À2, while diatoms dominated in winter, spring and autumn. Filamentous cyanophytes, particularly Microcoleus chthonoplastes, were most abundant during autumn, while coccoid chlorophytes (spring: Chlorococcum submarinum, Crucigenia tetrapedia, Tetraselmis suecica), euglenophytes (summer: Euglena obtusa), dinophytes (autumn: Amphidinium operculatum, A. herdmanii) and cryptophytes (autumn: Hillea marina, Hemiselmis virescens) contributed to the microphytobenthos during warmer seasons. The statistical analysis confirmed that the composition of the microphytobenthos was related to sediment features and to characteristics of particular seasons.

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Meiofauna Techniques

Somerfield¹,

Warwick²,

Moens³

2005

Methods for the Study of Marine Benthos

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Uncoupling of bacterial production and flagellate grazing in aquatic sediments: a case study from an intertidal flat

Cited by 45 publications

References 63 publications

The fate of bacterial carbon in an intertidal sediment: Modeling an in situ isotope tracer experiment

The fate of bacterial carbon in an intertidal sediment: Modeling an in situ isotope tracer experiment

Microphytobenthic dynamics in a Wadden Sea intertidal flat – Part II: Seasonal and spatial variability of non-diatom community components in relation to abiotic parameters

Meiofauna Techniques

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