A test of different factors influencing the isotopic signal of planktonic foraminifera in surface sediments from the northern South China Sea

Löwemark, Ludvig; Hong, Wei‐Li; Yui, Tzen‐Fu; Hung, Gwo-Wei

doi:10.1016/j.marmicro.2005.02.004

Cited by 54 publications

(52 citation statements)

References 46 publications

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“…At Site 1058, we measured the stable isotopic composition of both morphologies in 38 intervals. Consistent with the results of Wang (2000) and Löwenmark et al (2005) we find that on average the G. ruber s.s. has lower δ 18 O values than G. ruber s.l. (by ∼0.3‰) (Fig.…”

Section: Planktonic Foraminiferasupporting

confidence: 91%

“…4). Wang (2000) suggest (and Löwenmark et al (2005) agree) that the isotopic difference between the morphologies is best explained by calcification of G. ruber s.s. closer to the sea surface than G. ruber s.l. Although the scatter is relatively large at our site (one standard deviation of the mean is 0.4‰) we only use G. ruber s.s. in order to obtain an optimal record of sea surface variability.…”

Section: Planktonic Foraminiferamentioning

confidence: 86%

“…), which differ in the shape of the last chamber (Wang, 2000;Löwenmark et al, 2005). Wang (2000) illustrates that the stable isotopic composition of the two morphologies differs likely due to a difference in calcification depth.…”

Section: Planktonic Foraminiferamentioning

confidence: 99%

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Mid Pleistocene climate instability in the subtropical northwestern Atlantic

Billups

Lindley

Fisler

et al. 2006

Global and Planetary Change

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Section: Planktonic Foraminiferasupporting

confidence: 91%

Section: Planktonic Foraminiferamentioning

confidence: 86%

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Mid Pleistocene climate instability in the subtropical northwestern Atlantic

Billups

Lindley

Fisler

et al. 2006

Global and Planetary Change

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“…This method was chosen despite the fact that the carbon isotopic composition of organic linings in foraminiferal shells is isotopically lighter than the calcite (e.g., Ravelo and Hillaire-Marcel, 2007) due to metabolic (respired) CO 2 bound in the organic linings (Ní Fhlaithearta et al, 2013.). However, experiments on different cleaning techniques of planktonic foraminifera prior to stable isotope analyses have shown that the difference between uncleaned samples and oxidized (organics removed) samples is statistically not significant (Löwemark et al, 2005). These authors even recommended analyzing untreated samples in order to prevent the loss of carbonate material from the later chambers that are thinner and thus preferentially removed during the oxidation step while the initial chambers from a different ontogenetic stage are preserved.…”

Section: Methodsmentioning

confidence: 99%

Novel high-pressure culture experiments on deep-sea benthic foraminifera — Evidence for methane seepage-related δ13C of Cibicides wuellerstorfi

Wollenburg

Raitzsch

Tiedemann

2015

Marine Micropaleontology

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In field studies of active hydrocarbon seeps the carbon isotopic composition of Rose Bengal stained benthic foraminiferal tests (δ 13 C test ) and bottom water DIC (δ 13 C DIC ) deviates from their normal marine ratios. This circumstance led to ongoing discussions on whether aerobic foraminifers like Cibicides wuellerstorfi are capable of living at seepage sites and, more importantly, if their tests reflect the low δ 13 C values of emanating methane. To evaluate the discrepancy between δ 13 C DIC and δ 13 C test , we conducted methane seepage-emulating culture experiments on undepressurized sediments from the Håkon Mosby Mud Volcano, a modern methane seepage structure that hosts living C. wuellerstorfi with distinct negative δ 13 C values. The collected sediments were cultured at a site-alike pressure and mean bottom water methane concentration using newly developed high-pressure aquaria. Over an experimental period of 5 months our novel technology enabled a successful reproduction of all calcareous deep-sea benthic foraminiferal species living at that site, notably the first C. wuellerstorfi cultured in the laboratory. To show the influence of methane on δ 13 C test , we ran parallel experiments with N 99% 12 C-and 99% 13 C-methane in the experimental "bottom water". During the experimental running time methanotrophs in the water column obviously converted the experimentally added methane source to δ 13 C-enriched and -depleted DIC, respectively. Since whole sediment cores were cultured, it was impossible to keep δ 13 C DIC constant over the 5-month duration, which is reflected in a variability of δ 13 C test in foraminiferal shells. Irrespective of that, the methane source is reflected in δ 13 C test of foraminiferal shells, and for the natural seep-conditions simulating 12 C-experiment the mean δ 13 C DIC and δ 13 C test in C. wuellerstorfi were equal. Although for future culturing experiments improvements of the experimental conditions are advisable, our first results are evidence that persistent methane emanation impacts the carbon isotopic composition of deep-sea benthic foraminifera.

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“…This issue is par tic u larly rel e vant for ap pli ca tions on the sub spe cies (morphotype) level, which shows dis tinct ecol ogy with dif fer ent bi o log i cal life styles (e.g., hab i tat pref er ences, sea sonal pro duction max ima, strat i fi ca tion, sa lin ity - Numberger et al, 2009;Antonarakou et al, 2015) and pres ents a dif fer ent de gree of response to the diagenetic pro cesses (Antonarakou et al, 2012) re flected both in their sta ble iso tope com po si tions (Kawahata, 2005;Löwemark et al, 2005;Antonarakou et al, 2015) and Mg/Ca geo chem is try (Steinke et al, 2005;Bergami et al, 2008;Antonarakou et al, 2015). Such speciation can com pli cate field-based cal i bra tions be cause of the pos si bil ity of dis tinct spe cies-spe cific re la tion ships, and there fore it is clear that a better un der stand ing of the shell chem is try of the morphotypes is es sen tial for mean ing ful palaeoenvironmental re con structions (Steinhardt et al, 2015;Antonarakou et al, 2015).…”

Section: Plankton Tow Sediment Trap and Core-top Calibrationsmentioning

confidence: 99%