Measuring the in situ carbon isotopic composition of distinct marine plankton populations sorted by flow cytometry

Hansman, Roberta L.; Sessions, Alex L.

doi:10.1002/lom3.10073

Cited by 34 publications

(21 citation statements)

References 65 publications

(95 reference statements)

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“…These results indicate that in this region, there is an inverse trend between modelled p and [CO2(aq)]: p increases with decreasing [CO2(aq)], which can be best attributed to the variability in the gross size structure of the phytoplankton assemblage across the SSTC (Figure 7). showing less isotopic fractionation compared to smaller phytoplankton (Popp et al, 1998, Hansman andSessions, 2016). These cell size trends are observed across our open ocean transect, with the largest cell sizes having lower p and higher δ 13 CPOC.…”

Section: Carbon Uptake Fractionation Across the 40°s Transectsupporting

confidence: 70%

Isotopic fractionation of carbon during uptake by phytoplankton across the South Atlantic subtropical convergence

Tuerena¹,

Ganeshram²,

Humphreys³

et al. 2019

Preprint

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Abstract. The stable isotopic composition of particulate organic carbon (&#948;13CPOC) in the surface waters of the global ocean can vary with the aqueous CO2 concentration ([CO2(aq)]) and affects the trophic transfer of carbon isotopes in the marine food web. Other factors such as cell size, growth rate and carbon concentrating mechanisms decouple this observed correlation. Here, the variability in &#948;13CPOC is investigated in surface waters across the south subtropical convergence (SSTC) in the Atlantic Ocean, to determine carbon isotope fractionation (&#949;p) by phytoplankton and the contrasting mechanisms of carbon uptake in the subantarctic and subtropical water masses. Our results indicate that cell size is the primary determinant of &#948;13CPOC across the Atlantic SSTC in summer. Combining cell size estimates with CO2 concentrations, we can accurately estimate &#949;p within the varying surface water masses in this region. We further utilize these results to investigate future changes in &#949;p with increased anthropogenic carbon availability. Our results suggest that smaller cells, which are prevalent in the subtropical ocean, will respond less to increased [CO2(aq)] than the larger cells found south of the SSTC and in the wider Southern Ocean. In the subantarctic water masses, isotopic fractionation during carbon uptake will likely increase, both with increasing CO2 availability to the cell, but also if increased stratification leads to decreases in average community cell size. Coupled with decreasing &#948;13C of [CO2(aq)] due to anthropogenic CO2 emissions, this change in isotopic fractionation and lowering of &#948;13CPOC may propagate through the marine food web, with implications for the use of &#948;13CPOC as a tracer of dietary sources in the marine environment.

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Section: Carbon Uptake Fractionation Across the 40°s Transectsupporting

confidence: 70%

Isotopic fractionation of carbon during uptake by phytoplankton across the South Atlantic subtropical convergence

Tuerena¹,

Ganeshram²,

Humphreys³

et al. 2019

Preprint

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show abstract

“…Their values of  may be near zero and  f may be approaching  RubisCO . The result would be greater 13 C enrichment regardless of the uncertain or variable extent of active HCO 3uptake Wainright, 1991, Pancost et al, 1997;Tolosa et al, 2008;Hansman and Sessions, 2015). Conversely, to illustrate the nutrient-limited principle, modern haptophyte algae growing in oligotrophic waters produce  P values as large as ~19‰ (Laws et al, 2001;Tolosa et al, 2008;Pagani, 2014), clearly exceeding the 11‰ value of  RubisCO .…”

Section: Conclusion: Implications For Interpreting Paleoenvironmentamentioning

confidence: 99%

A general model for carbon isotopes in red-lineage phytoplankton: Interplay between unidirectional processes and fractionation by RubisCO

Wilkes

Pearson

2019

Geochimica et Cosmochimica Acta

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…Since previous results disentangled the local heterogeneity of this pool (Gregori et al, 2001;Cresson et al, 2012;Bănaru et al, 2014), the isotopic ratios of its two main components, nanophytoplankton (2 to 20 µm cells) and microphytoplankton (> 20 µm cells), were collected from the literature (Rau et al, 1990;Darnaude et al, 2004). Determination of phytoplankton isotopic ratios is a complex task that requires specific environmental conditions or complex methodologies (Hansman and Sessions, 2015;Miller and Page, 2012). Since the present study was part of a larger project, this would have represented a greater amount of work than could be undertaken.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Feeding strategies of co-occurring suspension feeders in an oligotrophic environment

2016

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International audienceSuspension-feeders predominate in the vast majority of the coastal marine benthic ecosystems, with several species co-occurring at low spatial scale. Understanding how these species cope with competition for trophic resources has been the core of numerous studies, mostly in coastal shallow systems where food supplies are diverse and abundant. Oligotrophic systems have received less attention. The aim of the present study was thus to investigate the trophic relationships established between 9 suspension feeders collected in an oligotro-phic zone (Bay of Marseille, French Mediterranean). Species displayed similar isotopic ratios, consistently with the use of one main source, identified as nanophytoplankton and diazotrophic bacteria as the δ 15 N values were low, in contrast to interspecific differences generally observed. The seasonal variations of the isotopic ratios and isotopic niche indices were explained by differential sorting abilities, higher for bivalves than for ascidians and the polychaete Chaetopterus variopedatus. The present results demonstrate that resource availability in oligo-trophic systems is a major driver of trophic competition. It precludes a general conclusion about suspension feeders trophic patterns drawn exclusively from highly productive systems, and stresses the need for an extensive assessment of those patterns in a vast range of ecosystems

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Measuring the in situ carbon isotopic composition of distinct marine plankton populations sorted by flow cytometry

Cited by 34 publications

References 65 publications

Isotopic fractionation of carbon during uptake by phytoplankton across the South Atlantic subtropical convergence

Isotopic fractionation of carbon during uptake by phytoplankton across the South Atlantic subtropical convergence

A general model for carbon isotopes in red-lineage phytoplankton: Interplay between unidirectional processes and fractionation by RubisCO

Feeding strategies of co-occurring suspension feeders in an oligotrophic environment

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