A culture-based calibration of benthic foraminiferal paleotemperature proxies: δ&lt;sup&gt;18&lt;/sup&gt;O and  Mg/Ca results

Abstract. Benthic foraminifera were cultured for five months at four temperatures (4, 7, 14 and 21 °C) to establish the temperature dependence of foraminiferal δ18O and Mg/Ca. Two Bulimina species (B. aculeata and B. marginata) were most successful, adding chambers at all four temperatures and reproducing at 7 and 14 °C. Foraminiferal δ18O values displayed ontogenetic variations, with lower values in younger individuals. The δ18O values of adult specimens decreased with increasing temperature in all but the 4 °C treatment, exhibiting a relationship consistent with previous δ18O paleotemperature calibration studies. Foraminiferal Mg/Ca values, determined by laser ablation inductively coupled plasma mass spectrometry, were broadly consistent with previous Mg/Ca calibration studies, but extremely high values in the 4 °C treatment and higher than expected values at two of the other three temperatures make it challenging to interpret these results.

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A culture-based calibration of benthic foraminiferal paleotemperature proxies: δ<sup>18</sup>O and Mg/Ca results

Biogeosciences ◽

10.5194/bg-7-1335-2010 ◽

2010 ◽

Vol 7 (4) ◽

pp. 1335-1347 ◽

Cited By ~ 28

Author(s):

H. L. Filipsson ◽

J. M. Bernhard ◽

S. A. Lincoln ◽

D. C. McCorkle

Keyword(s):

Mass Spectrometry ◽

Laser Ablation ◽

Temperature Dependence ◽

Benthic Foraminifera ◽

Inductively Coupled Plasma ◽

The Other ◽

Inductively Coupled ◽

Plasma Mass Spectrometry ◽

Predicted Values ◽

Increasing Temperature

Abstract. Benthic foraminifera were cultured for five months at four temperatures (4, 7, 14 and 21 °C) to establish the temperature dependence of foraminiferal calcite δ18O and Mg/Ca. Two Bulimina species (B. aculeata and B. marginata) were most successful in terms of calcification, adding chambers at all four temperatures and reproducing at 7 and 14 °C. Foraminiferal δ18O values displayed ontogenetic variations, with lower values in younger individuals. The δ18O values of adult specimens decreased with increasing temperature in all but the 4 °C treatment, exhibiting a relationship consistent with previous δ18O paleotemperature calibration studies. Foraminiferal Mg/Ca values, determined by laser ablation inductively coupled plasma mass spectrometry, were broadly consistent with previous Mg/Ca calibration studies, but extremely high values in the 4 °C treatment and higher than predicted values at two of the other three temperatures make it challenging to interpret these results.

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Ingestion of trace metals by the opossum shrimp, Mysis relicta, determined by laser ablation sampling - inductively coupled plasma mass spectrometry

Canadian Journal of Zoology ◽

10.1139/z98-084 ◽

1998 ◽

Vol 76 (8) ◽

pp. 1605-1610 ◽

Cited By ~ 2

Author(s):

David C Lasenby ◽

Geoff Veinott

Keyword(s):

Mass Spectrometry ◽

Laser Ablation ◽

Trace Metals ◽

Inductively Coupled Plasma ◽

The Other ◽

Gut Contents ◽

Mysis Relicta ◽

Inductively Coupled ◽

Opossum Shrimp ◽

Plasma Mass Spectrometry

Differences in the diet of individual mysids can be determined by analysing the elemental composition of the gut contents of individual mysids with laser ablation sampling - inductively coupled plasma mass spectrometry. Two groups of the opossum shrimp, Mysis relicta, were cultured in the laboratory for a 2-week period. One group was fed a diet of Daphnia magna and the other lake sediment. Although the element:Sr ratios within the gut were highly variable, mean element:Sr ratios of several elements (V, Pb, Ca) in the gut of mysids fed D. magna were significantly different from those in the gut of sediment-fed mysids.

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