Test morphology as a function of behavioral strategies — Inferences from benthic foraminifera

Dubicka, Zofia; Złotnik, Michał; Borszcz, Tomasz

doi:10.1016/j.marmicro.2015.01.003

Cited by 22 publications

(12 citation statements)

References 54 publications

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“…Stable carbon and oxygen isotopes were measured at ZMT (Leibniz Centre for Tropical Marine Ecology) in Bremen, using a Finnigan MAT 253 ™ gas isotope ratio mass spectrometer with a Kiel IV automated carbonate preparation device (standard deviations of house standard: 0.02 ‰ for δ 13 C and 0.06 ‰ for δ 18 O), and at MARUM (Bremen), using a Finnigan MAT 251 ™ mass spectrometer with a Kiel I carbonate preparation device (standard deviations of house standard: 0.02 ‰ for δ 13 C and 0.03 ‰ for δ 18 O). The measurements were performed on two to eight tests (test size: 150-500 µm) of the epibenthic foraminifera Cibicides lobatulus (Ahrens et al, 1997;Dubicka et al, 2015) and the endobenthic foraminifera Nonionellina labradorica (Ahrens et al, 1997;Alve and Bernhard, 1995;Loubere and Rayray, 2016) for bottom water and pore water signals, respectively. Stable oxygen isotope values were corrected for a global ice volume effect (Waelbroeck et al, 2002) and adjusted for vital effects: +0.64 ‰ for C. lobatulus (Shackleton, 1974) and −0.2 ‰ for N. labradorica (Duplessy et al, 2005).…”

Section: Stable Isotope Measurementsmentioning

confidence: 99%

Atlantic Water advection vs glacier dynamics in northern Spitsbergen since early deglaciation

Bartels¹,

Titschack²,

Fahl³

et al. 2017

Preprint

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Abstract. Atlantic Water (AW) advection plays an important role for climatic, oceanographic and environmental conditions in the eastern Arctic. Situated along the only deep connection between the Atlantic and the Arctic Ocean, the Svalbard Archipelago is an ideal location to reconstruct the past AW advection history and document its linkage with local glacier dynamics, as illustrated in the present study of a sedimentary record from Woodfjorden (northern Spitsbergen) spanning the last ~ 15 500 years. Sedimentological, micropalaeontological and geochemical analyses were used to reconstruct changes in marine environmental conditions, sea-ice cover and glacier activity. Data illustrate a partial breakup of the Svalbard–Barents–Sea Ice Sheet from Heinrich Stadial 1 onwards (until ~ 14.6 ka BP). During the Bølling-Allerød (~ 14.6–12.7 ka BP), AW penetrated as a bottom water mass into the fjord system and contributed significantly to the destabilisation of local glaciers. During the Younger Dryas (~ 12.7–11.7 ka BP), it intruded into intermediate waters while evidence for a glacier advance is lacking. A short-term deepening of the halocline occurred at the very end of this interval. During the early Holocene (~ 11.7–7.8 ka BP), mild conditions led to glacier retreat, a reduced sea-ice cover and increasing sea surface temperatures, with a brief interruption during the Preboreal Oscillation (~ 11.1–10.8 ka BP). During the late Holocene (~ 1.8–0.4 ka BP), a slightly reduced AW inflow and lower sea surface temperatures compared to the early Holocene are reconstructed. Glaciers, which previously retreated to the shallower inner parts of the Woodfjorden system, likely advanced during the late Holocene. In particular, as topographic control in concert with the reduced summer insolation partly decoupled glacier dynamics from AW advection during this recent interval.

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Section: Stable Isotope Measurementsmentioning

confidence: 99%

Atlantic Water advection vs glacier dynamics in northern Spitsbergen since early deglaciation

Bartels¹,

Titschack²,

Fahl³

et al. 2017

Preprint

View full text Add to dashboard Cite

show abstract

“…The measurements were performed on two to eight tests (test size: 150-500 µm) of the epibenthic foraminifera Cibicides lobatulus (Ahrens et al, 1997;Dubicka et al, 2015) and the endobenthic foraminifera Nonionellina labradorica (Ahrens et al, 1997;Alve and Bernhard, 1995;Loubere and Rayray, 2016) for bottom water and pore water signals, respectively. Stable oxygen isotope values were corrected for a global ice volume effect (Waelbroeck et al, 2002) and adjusted for vital effects: +0.64 ‰ for C. lobatulus (Shackleton, 1974) and −0.2 ‰ for N. labradorica (Duplessy et al, 2005).…”

Section: Stable Isotope Measurementsmentioning

confidence: 99%

Atlantic Water advection vs. glacier dynamics in northern Spitsbergen since early deglaciation

et al. 2017

View full text Add to dashboard Cite

Abstract. Atlantic Water (AW) advection plays an important role in climatic, oceanographic and environmental conditions in the eastern Arctic. Situated along the only deep connection between the Atlantic and the Arctic oceans, the Svalbard Archipelago is an ideal location to reconstruct the past AW advection history and document its linkage with local glacier dynamics, as illustrated in the present study of a 275 cm long sedimentary record from Woodfjorden (northern Spitsbergen; water depth: 171 m) spanning the last ∼ 15 500 years.

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“…At about 80 kyr after the beginning of the PETM, large and flat Cibicidoides with coarse pores on the spiral side increased in relative abundance, an unusual feature for PETM assemblages [Thomas, 1998]. Possibly, these species resembled the living Cibicidoides wuellerstorfi [Lutze and Thiel, 1989] or Cibicidoides lobatulus [Dubicka et al, 2015;Gooday et al, 2015], living epifaunally attached to hard surfaces [Thomas, 1998]. These epifaunal species could not thrive during the phase of deep-sea ocean acidification during peak PETM, but they may have become abundant when currents were still too strong to allow reestablishment of the shallow infaunal suspension feeders [Schoenfeld, 2002] and corrosiveness declined.…”

Section: 1002/2015pa002837mentioning

confidence: 99%

Late Paleocene‐middle Eocene benthic foraminifera on a Pacific seamount (Allison Guyot, ODP Site 865): Greenhouse climate and superimposed hyperthermal events

2016

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We investigated the response of late Paleocene-middle Eocene (~60-37.5 Ma) benthic foraminiferal assemblages to long-term climate change and hyperthermal events including the Paleocene-Eocene Thermal Maximum (PETM) at Ocean Drilling Program (ODP) Site 865 on Allison Guyot, a seamount in the Mid-Pacific Mountains. Seamounts are isolated deep-sea environments where enhanced current systems interrupt bentho-pelagic coupling, and fossil assemblages from such settings have been little evaluated. Assemblages at Site 865 are diverse and dominated by cylindrical calcareous taxa with complex apertures, an extinct group which probably lived infaunally. Dominance of an infaunal morphogroup is unexpected in a highly oligotrophic setting, but these forms may have been shallow infaunal suspension feeders, which were ecologically successful on the current-swept seamount. The magnitude of the PETM extinction at Site 865 was similar to other sites globally, but lower diversity postextinction faunas at this location were affected by ocean acidification as well as changes in current regime, which might have led to increased nutrient supply through trophic focusing. A minor hyperthermal saw less severe effects of changes in current regime, with no evidence for carbonate dissolution. Although the relative abundance of infaunal benthic foraminifera has been used as a proxy for surface productivity through bentho-pelagic coupling, we argue that this proxy can be used only in the absence of changes in carbonate saturation and current-driven biophysical linking.

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Test morphology as a function of behavioral strategies — Inferences from benthic foraminifera

Cited by 22 publications

References 54 publications

Atlantic Water advection vs glacier dynamics in northern Spitsbergen since early deglaciation

Atlantic Water advection vs glacier dynamics in northern Spitsbergen since early deglaciation

Atlantic Water advection vs. glacier dynamics in northern Spitsbergen since early deglaciation

Late Paleocene‐middle Eocene benthic foraminifera on a Pacific seamount (Allison Guyot, ODP Site 865): Greenhouse climate and superimposed hyperthermal events

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