Vertical distributions and stable isotopic compositions of live (stained) benthic foraminifera from the North Carolina and California continental margins

McCorkle, Daniel C.; Corliss, Bruce H.; Farnham, Christie

doi:10.1016/s0967-0637(97)00004-6

Cited by 190 publications

(193 citation statements)

References 59 publications

Supporting

Mentioning

170

Contrasting

Unclassified

Order By: Relevance

“…Another consideration, adopted in numerous studies, is that epifaunal and infaunal inter-species isotopic offsets reflect, in part, pore water chemistry at the preferred depth habitat of each species within the sediment (e.g. Loubere et al, 1995;McCorkle et al, 1997;Theodor et al, 2016). The carbon isotope composition of pore water dissolved inorganic carbon (δ 13 C DIC ) has been shown to become lighter (lower δ 13 C) with sediment depth (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…This assumption is held despite the wide range of sediment depths that individual infaunal species have been observed to live at (e.g. McCorkle et al, 1997). Furthermore, isotope analysis of "live" (Rose Bengal stained) foraminifera reveals a narrow range of isotope values for individuals of the same species despite them having been recovered from a wide range of depths beneath the sediment surface (McCorkle et al, 1990(McCorkle et al, , 1997Schmiedl et al, 2004;Fontanier et al, 2006bFontanier et al, , 2008Theodor et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

“Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths

Dejardin

Kender

Allen

et al. 2018

J. Micropalaeontol.

View full text Add to dashboard Cite

Abstract. It is widely held that benthic foraminifera exhibit species-specific calcification depth preferences, with their tests recording sediment pore water chemistry at that depth (i.e. stable isotope and trace metal compositions). This assumed depth-habitat-specific pore water chemistry relationship has been used to reconstruct various palaeoenvironmental parameters, such as bottom water oxygenation. However, many deepwater foraminiferal studies show wide intra-species variation in sediment living depth but relatively narrow intra-species variation in stable isotope composition. To investigate this depth-habitat-stable-isotope relationship on the shelf, we analysed depth distribution and stable isotopes of "living" (Rose Bengal stained) benthic foraminifera from two box cores collected on the South Georgia shelf (ranging from 250 to 300 m water depth). We provide a comprehensive taxonomic analysis of the benthic fauna, comprising 79 taxonomic groupings. The fauna shows close affinities with shelf assemblages from around Antarctica. We find "live" specimens of a number of calcareous species from a range of depths in the sediment column. Stable isotope ratios (δ 13 C and δ 18 O) were measured on stained specimens of three species, Astrononion echolsi, Cassidulinoides porrectus, and Buccella sp. 1, at 1 cm depth intervals within the downcore sediment sequences. In agreement with studies in deep-water settings, we find no significant intra-species variability in either δ 13 C foram or δ 18 O foram with sediment living depth on the South Georgia shelf. Our findings add to the growing evidence that infaunal benthic foraminiferal species calcify at a fixed depth. Given the wide range of depths at which we find "living", "infaunal" species, we speculate that they may actually calcify predominantly at the sediment-seawater interface, where carbonate ion concentration and organic carbon availability is at a maximum.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths

Dejardin

Kender

Allen

et al. 2018

J. Micropalaeontol.

View full text Add to dashboard Cite

show abstract

“…Using a binocular microscope, 3 to 10 species of Bulimina aculeata, which calcifies its test close to the calcite oxygen isotope equilibrium (McCorkle et al, 1997), were hand-picked from the > 150 µm fraction of each sample. Foraminifera were analyzed at the Bloomsbury Environmental Isotope Facility of the University College London.…”

Section: Benthic Oxygen Isotope Measurementsmentioning

confidence: 99%

Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr

Rella

Uchida

2011

Biogeosciences

View full text Add to dashboard Cite

Abstract. Knowledge on past variability of sedimentary organic carbon in the Arctic Ocean is important to assess natural carbon cycling and transport processes related to global climate changes. However, the late Pleistocene oceanographic history of the Arctic is still poorly understood. In the present study we show sedimentary records of total organic carbon (TOC), CaCO 3 , benthic foraminiferal δ 18 O and the coarse grain size fraction from a piston core recovered from the northern Northwind Ridge in the far western Arctic Ocean, a region potentially sensitively responding to past variability in surface current regimes and sedimentary processes such as coastal erosion. An age model based on oxygen stratigraphy, radiocarbon dating and lithological constraints suggests that the piston core records paleoenvironmental changes of the last 155 kyr. TOC shows orbital-scale increases and decreases that can be respectively correlated to the waxing and waning of large ice sheets dominating the Eurasian Arctic, suggesting advection of fine suspended matter derived from glacial erosion to the Northwind Ridge by eastward flowing intermediate water and/or surface water and sea ice during cold episodes of the last two glacialinterglacial cycles. At millennial scales, increases in TOC might correlate to a suite of Dansgaard-Oeschger Stadials between 120 and 45 ka before present (BP) indicating a possible response to abrupt northern hemispheric temperature changes. Between 70 and 45 ka BP, closures and openings of the Bering Strait could have additionally influenced TOC variability. CaCO 3 content tends to anti-correlate with TOC on both orbital and millennial time scales, which we interpret in terms of enhanced sediment advection from the carbonaterich Canadian Arctic via an extended Beaufort Gyre during warm periods of the last two glacial-interglacial cycles and increased organic carbon advection from the Siberian Arctic Correspondence to: M. Uchida (uchidama@nies.go.jp) during cold periods when the Beaufort Gyre contracted. We propose that this pattern may be related to orbital-and millennial-scale variations of dominant atmospheric surface pressure systems expressed in mode shifts of the Arctic Oscillation.

show abstract

“…[3] Variable flux of C org to the seafloor also influences the stable carbon isotope composition of calcareous benthic foraminifera (d 13 C), particularly of shallow infaunal species that live in organic-rich environments such as Uvigerina peregrina [Dunbar and Wefer, 1984;Zahn et al, 1986;McCorkle et al, 1990McCorkle et al, , 1997Fontanier et al, 2006] or Bulimina aculeata [Mackensen and Licari, 2004]. For this reason, d 13 C of these taxa does not directly reflect the ambient deep water chemistry and its use in deepwater paleoceanography is limited.…”

Section: Introductionmentioning

confidence: 99%

Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes

et al. 2007

View full text Add to dashboard Cite

[1] Benthic foraminiferal assemblages and the carbon isotope composition of the epifaunal benthic foraminifera Epistominella exigua and Fontbotia wuellerstorfi have been investigated along core MD02-2589 located at the southern Agulhas Plateau (41°26.03 0 S, 25°15.30 0 E, 2660 m water depth). This study aims to evaluate changes in the benthic paleoenvironment and its influence on benthic d 13 C with a notable focus on E. exigua, a species associated with phytodetritus deposits and poorly studied in isotope paleoceanographic reconstructions. The benthic foraminiferal assemblages (>63 mm) show large fluctuations in species composition suggesting significant changes in the pattern of ocean surface productivity conceivably related to migrations of the Subtropical Convergence (STC) and Subantarctic Front (SAF). Low to moderate seasonality and relatively higher food supply to the seafloor are indicated during glacial marine isotope stages (MIS) 6, 4, and 2 and during MIS 3, probably associated with the northward migration of the SAF and confluence with the more stationary STC above the southern flank of the Agulhas Plateau. The lowest organic carbon supply to the seafloor is indicated from late MIS 5b to MIS 4 as a consequence of increased influence of the Agulhas Front (AF) and/or weakening of the influence of the STC over the region. Episodic delivery of fresh organic matter, similar to modern conditions at the core location, is indicated during MIS 5c-MIS 5e and at Termination I. Comparison of this paleoenvironmental information with the paired d 13 C records of E. exigua and F. wuellerstorfi suggests that organic carbon offsets d 13 C of E. exigua from ambient bottom water d 13 C DIC , while its d 13 C amplitude, on glacial-interglacial timescales, does not seem affected by changes of organic carbon supply to the seafloor. This suggests that this species calcifies preferentially during the short time span of the year when productivity peaks and phytodetritus is delivered to the seafloor. Therefore E. exigua, while offset from d 13 C DIC , potentially more faithfully records the amplitude of ambient bottom water d 13 C DIC changes than F. wuellerstorfi, notably in settings such as the Southern Ocean that experienced substantial changes through time in the organic carbon supply to the seafloor.Citation: Diz, P., I. R. Hall, R. Zahn, and E. G. Molyneux (2007), Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes, Paleoceanography, 22, PA4218,

show abstract

Vertical distributions and stable isotopic compositions of live (stained) benthic foraminifera from the North Carolina and California continental margins

Cited by 190 publications

References 59 publications

“Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths

“Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths

Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr

Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes

Contact Info

Product

Resources

About