Field and laboratory studies on the ontogeny and ecology of some globorotaliid species from the Sargasso Sea off Bermuda

Hemleben, Christoph; Spindler, Michael; Breitinger, Ingrid; Deuser, W. G.

doi:10.2113/gsjfr.15.4.254

Cited by 134 publications

(115 citation statements)

References 0 publications

Supporting

Mentioning

103

Contrasting

Unclassified

Order By: Relevance

“…The observed increase in Mg/Ca of the crust towards the younger chambers would then suggest upward migration of this species during crust formation. This suggestion of gradual crust formation is in contradiction with laboratory studies that showed that crust formation occurs rapidly and simultaneously on all chambers (where crust formation takes place) when the foraminifer descends to colder waters near the end of its life cycle Hemleben and Spindler, 1983;Hemleben et al, 1985). Furthermore, N. dutertrei is thought to descend in the water column as it ages (e.g.…”

Section: Discussionmentioning

confidence: 67%

“…Duckworth, 1977;Sautter, 1998). In N. dutertrei, the presence of a crust has been extensively documented using various analytical methods (Sautter, 1998;Eggins et al, 2003;Hemleben et al, 1985). Here we use this correlation between crystal morphology and differences in Mg/Ca and Mn/Ca in the profiles to distinguish between the two layers (cf.…”

Section: Discussionmentioning

confidence: 99%

“…4 and 5). Laboratory studies have shown that species of the genus Neogloboquadrina are capable of adopting a benthic life style and surviving for a prolonged period in cold and dark conditions (Hemleben et al, 1985). Hemleben et al (1977) also mention gradual crust formation in G. menardii, but information on the duration of the crust formation process is not available.…”

Section: Potential Controls On Crust Heterogeneitymentioning

confidence: 99%

See 2 more Smart Citations

Encrustation and trace element composition of <i>Neogloboquadrina dutertrei</i> assessed from single chamber analyses – implications for paleotemperature estimates

Jonkers¹,

Nooijer

Reichart

et al. 2012

Biogeosciences

View full text Add to dashboard Cite

Abstract. Crust formation is a common phenomenon in planktonic foraminifera. Because of their different formation mechanism and hence composition, crusts affect the overall test composition and therefore complicate the use of crustbearing foraminifera in paleoceanography. Such species are often used to estimate subsurface paleotemperatures, and although the influence of encrustation on the trace element/Ca ratio is recognised, it has not been systematically explored between and within tests. Here we use laser ablation ICP-MS to assess the variability in trace element composition of the crust of Neogloboquadrina dutertrei within individual chambers, as well as the effect of compositional heterogeneity of the crust on whole test chemistry. Compositionally, the outer crust differs from inner layer by lower Mg/Ca and Mn/Ca, but is indistinguishable in Sr/Ca. Crust thickness decreases towards the younger chambers, and it may be entirely absent from the last chamber. In contrast to Mn/Ca and Sr/Ca, crustal Mg/Ca ratios show a tendency towards higher values on the younger chambers. These patterns in crust thickness and in crust Mg/Ca indicate that temperature is not the dominant factor controlling crust composition. Temperature estimates based on N. dutertrei, and presumably other crust-forming species too, are therefore biased towards too low values. Through comparison of modern and glacial tests, we show that this bias is not constant and that changes in crust thickness and/or in Mg/Ca values can spuriously suggest temperature changes.

show abstract

Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 99%

Section: Potential Controls On Crust Heterogeneitymentioning

confidence: 99%

See 1 more Smart Citation

Encrustation and trace element composition of <i>Neogloboquadrina dutertrei</i> assessed from single chamber analyses – implications for paleotemperature estimates

Jonkers¹,

Nooijer

Reichart

et al. 2012

Biogeosciences

View full text Add to dashboard Cite

show abstract

“…In a number of species such as G. sacculifer, gametogenesis is preceded by the production of a layer of calcite covering spine holes and the terrace-like structures of inter-pore rims (Towe and Cifelli, 1967;Bé, 1980;Hemleben et al, 1985;Brummer et al, 1987). This GAM calcite veneer gives the foraminifera a smooth appearance by covering the rough topography of the shell surface and it has been suggested that it is enriched in some trace elements compared to the ontogenetic calcite (Hathorne et al, 2009).…”

Section: Overgrowth and Encrustingmentioning

confidence: 99%

Biomineralization in perforate foraminifera

Nooijer

Spero

Erez

et al. 2014

Earth-Science Reviews

201

190

View full text Add to dashboard Cite

a b s t r a c t a r t i c l e i n f oIn this paper, we review the current understanding of biomineralization in perforate foraminifera. Ideas on the mechanisms responsible for the flux of Ca 2+ and inorganic carbon from seawater into the test were originally based on light and electron microscopic observations of calcifying foraminifera. From the 1980s onward, tracer experiments, fluorescent microscopy and high-resolution test geochemical analysis have added to existing calcification models. Despite recent insights, no general consensus on the physiological basis of foraminiferal biomineralization exists. Current models include seawater vacuolization, transmembrane ion transport, involvement of organic matrices and/or pH regulation, although the magnitude of these controls remain to be quantified. Disagreement between currently available models may be caused by the use of different foraminiferal species as subject for biomineralization experiments and/or lack of a more systematic approach to study (dis)similarities between taxa. In order to understand foraminiferal controls on element incorporation and isotope fractionation, and thereby improve the value of foraminifera as paleoceanographic proxies, it is necessary to identify key processes in foraminiferal biomineralization and formulate hypotheses regarding the involved physiological pathways to provide directions for future research.

show abstract

“…Laboratory culture experiments have provided a unique source of information in this direction (e.g. Be´, 1980;Hemleben et al, 1985). For example, it has been observed that many planktonic species add a calcite crust (or ''gametogenic crust'') in deeper, colder water immediately prior to reproduction.…”

Section: Calibration Of Planktonic Foraminiferal Mg/ca Versus Temperamentioning

confidence: 99%

Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum

Barker

Cacho

Benway

et al. 2005

Quaternary Science Reviews

235

163

View full text Add to dashboard Cite

As part of the Multi-proxy Approach for the Reconstruction of the Glacial Ocean (MARGO) incentive, published and unpublished temperature reconstructions for the Last Glacial Maximum (LGM) based on planktonic foraminiferal Mg/Ca ratios have been synthesised and made available in an online database. Development and applications of Mg/Ca thermometry are described in order to illustrate the current state of the method. Various attempts to calibrate foraminiferal Mg/Ca ratios with temperature, including culture, trap and core-top approaches have given very consistent results although differences in methodological techniques can produce offsets between laboratories which need to be assessed and accounted for where possible. Dissolution of foraminiferal calcite at the sea-floor generally causes a lowering of Mg/Ca ratios. This effect requires further study in order to account and potentially correct for it if dissolution has occurred. Mg/Ca thermometry has advantages over other paleotemperature proxies including its use to investigate changes in the oxygen isotopic composition of seawater and the ability to reconstruct changes in the thermal structure of the water column by use of multiple species from different depth and or seasonal habitats. Presently available data are somewhat limited to low latitudes where they give fairly consistent values for the temperature difference between Late Holocene and the LGM (2-3.5 1C). Data from higher latitudes are more sparse, and suggest there may be complicating factors when comparing between multi-proxy reconstructions. r

show abstract

Field and laboratory studies on the ontogeny and ecology of some globorotaliid species from the Sargasso Sea off Bermuda

Cited by 134 publications

References 0 publications

Encrustation and trace element composition of <i>Neogloboquadrina dutertrei</i> assessed from single chamber analyses – implications for paleotemperature estimates

Encrustation and trace element composition of <i>Neogloboquadrina dutertrei</i> assessed from single chamber analyses – implications for paleotemperature estimates

Biomineralization in perforate foraminifera

Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum

Contact Info

Product

Resources

About

Field and laboratory studies on the ontogeny and ecology of some globorotaliid species from the Sargasso Sea off Bermuda

Cited by 134 publications

References 0 publications

Encrustation and trace element composition of &lt;i&gt;Neogloboquadrina dutertrei&lt;/i&gt; assessed from single chamber analyses – implications for paleotemperature estimates

Encrustation and trace element composition of &lt;i&gt;Neogloboquadrina dutertrei&lt;/i&gt; assessed from single chamber analyses – implications for paleotemperature estimates

Biomineralization in perforate foraminifera

Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum

Contact Info

Product

Resources

About

Encrustation and trace element composition of <i>Neogloboquadrina dutertrei</i> assessed from single chamber analyses – implications for paleotemperature estimates

Encrustation and trace element composition of <i>Neogloboquadrina dutertrei</i> assessed from single chamber analyses – implications for paleotemperature estimates