Grazing of intertidal benthic foraminifera on bacteria: Assessment using pulse-chase radiotracing

Mojtahid, Meryem; Zubkov, Mikhail V.; Hartmann, Manuela; Gooday, Andrew J.

doi:10.1016/j.jembe.2011.01.011

Cited by 44 publications

(24 citation statements)

References 63 publications

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“…For foraminifera, the carbon source can vary with species (Oakes et al 2010a). Foraminifera can obtain carbon from MPB and phytodetritus (Moodley et al 2002, Oakes et al 2010a, as well as from bacteria (Mojtahid et al 2011), macrophyte detritus (Oakes et al 2010a), and dissolved organic matter (DeLaca 1982). Larger foraminifera can contain symbiotic algae, allowing them to directly access inorganic carbon as a source (Lee 1995).…”

Section: Discussionmentioning

confidence: 99%

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A ¹³C‐labeling study

Oakes

Eyre

Middelburg

2012

Limnology & Oceanography

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Microphytobenthos (MPB) in photic sediments are highly productive but the fate of this production remains uncertain. Over 33 d, tracing of 13 C from added bicarbonate in subtropical shallow subtidal sand showed rapid transfer of MPB-derived carbon to deeper sediment; below 2 cm (31% within 60 h) and 5 cm (18%). Despite their high turnover (5.5 d) and only representing , 8% of sediment organic carbon, MPB represented up to 35% of the 13 C retained in sediments, demonstrating substantial carbon recycling. Carbon was rapidly transferred to heterotrophs, but their contribution to sediment 13 C was similar to their biomass contribution (, 0.1% to 3.8%), with the exception of the foraminifera Cellanthus craticulatus, which accounted for up to 33% of the 13 C within sediment. There was little loss of MPB-derived carbon via dissolved organic carbon (DOC) effluxes (3%) or resuspension (minimal). Respiration was the major loss pathway (63%), reflecting the high microbial biomass typical of lower latitudes. Given that MPB take up dissolved inorganic carbon (DIC) from overlying water, and the carbon they fix is released as DIC, MPB in subtropical sands are unlikely to substantially alter the form of carbon transported offshore (i.e., there is no conversion to DOC), but processing within the sediment may alter its d 13 C value. Given that 31% of fixed carbon remained in sediments after 33 d, subtropical sands may act as a carbon sink, thereby affecting the quantity of carbon transported offshore.

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Section: Discussionmentioning

confidence: 99%

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A ¹³C‐labeling study

Oakes

Eyre

Middelburg

2012

Limnology & Oceanography

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“…Talge & Hallock 2003, Pascal et al 2008, Mojtahid et al 2011) generally use either adults of relatively large species, which are easy to isolate and manipulate, or complete as semblages in their original sediment which are transferred from field to experimental conditions (microcosms). Separating individuals which have grown and/or reproduced from those which have not during the course of the experiment is commonly time-consuming, a logistical challenge, and may introduce errors.…”

Section: Discussionmentioning

confidence: 99%

“…Two species use organelle retention: Haynesina germanica (Lopez 1979, Knight & Mantoura 1985, Austin et al 2005 and Elphidium excavatum (Correia & Lee 2000), both sequester diatom chloroplasts. In addition, H. germanica may graze on bacteria (Mojtahid et al 2011). Psammophaga sp., characterized by its avid ingestion of silt-sized sediment, is most likely a deposit feeder.…”

Section: Discussionmentioning

confidence: 99%

Experimental assembly of foraminiferal communities from coastal propagule banks

Goldstein¹,

Alve²

2011

Mar. Ecol. Prog. Ser.

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“…Protein-biomass of planktic foraminifers was analysed with the bicinchoninic acid (BCA) method developed by Smith (1985), using a mix of copper solution (4 % (w / v) CuSO 4 5H 2 O solution; Sigma-Aldrich) and BCA (Sigma) solution (Smith et al, 1985;Zubkov and Sleigh, 1999;Mojtahid et al, 2011). In contact with proteins the Cu 2+ ions of the copper solution are reduced to Cu + .…”

Section: Planktic Foraminifer Protein Analyses Using Nano-spectrophotmentioning

confidence: 99%

First-order estimate of the planktic foraminifer biomass in the modern ocean

Schiebel

Movellan

2012

Earth Syst. Sci. Data

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Abstract. Planktic foraminifera are heterotrophic mesozooplankton of global marine abundance. The position of planktic foraminifers in the marine food web is different compared to other protozoans and ranges above the base of heterotrophic consumers. Being secondary producers with an omnivorous diet, which ranges from algae to small metazoans, planktic foraminifers are not limited to a single food source, and are assumed to occur at a balanced abundance displaying the overall marine biological productivity at a regional scale. With a new non-destructive protocol developed from the bicinchoninic acid (BCA) method and nano-photospectrometry, we have analysed the protein-biomass, along with test size and weight, of 754 individual planktic foraminifers from 21 different species and morphotypes. From additional CHN analysis, it can be assumed that proteinbiomass equals carbon-biomass. Accordingly, the average individual planktic foraminifer protein-and carbonbiomass amounts to 0.845 µg. Samples include symbiont bearing and symbiont-barren species from the sea surface down to 2500 m water depth. Conversion factors between individual biomass and assemblage-biomass are calculated for test sizes between 72 and 845 µm (minimum test diameter). Assemblage-biomass data presented here include 1128 sites and water depth intervals. The regional coverage of data includes the North Atlantic, Arabian Sea, Red Sea, and Caribbean as well as literature data from the eastern and western North Pacific, and covers a wide range of oligotrophic to eutrophic waters over six orders of magnitude of plankticforaminifer assemblage-biomass (PFAB). A first order estimate of the average global planktic foraminifer biomass production (> 125 µm) ranges from 8.2-32.7 Tg C yr −1 (i.e. 0.008-0.033 Gt C yr −1 ), and might be more than three times as high including neanic and juvenile individuals adding up to 25-100 Tg C yr −1 . However, this is a first estimate of regional PFAB extrapolated to the global scale, and future estimates based on larger data sets might considerably deviate from the one presented here. This paper is supported by, and a contribution to the Marine Ecosystem Data project (MAREDAT).

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Grazing of intertidal benthic foraminifera on bacteria: Assessment using pulse-chase radiotracing

Cited by 44 publications

References 63 publications

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A ¹³C‐labeling study

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A ¹³C‐labeling study

Experimental assembly of foraminiferal communities from coastal propagule banks

First-order estimate of the planktic foraminifer biomass in the modern ocean

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Grazing of intertidal benthic foraminifera on bacteria: Assessment using pulse-chase radiotracing

Cited by 44 publications

References 63 publications

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A 13C‐labeling study

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A 13C‐labeling study

Experimental assembly of foraminiferal communities from coastal propagule banks

First-order estimate of the planktic foraminifer biomass in the modern ocean

Contact Info

Product

Resources

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Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A ¹³C‐labeling study

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A ¹³C‐labeling study