Citation:

2005GC000926

Name: Stable isotope and Mg/Ca record of Globigerinoides ruger morphotypes
Published: 2005
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Tests of the planktonic foraminifer Globigerinoides ruber (white; d'Orbigny) have become a standard tool for reconstructing past oceanic environments. Paleoceanographers often utilize the Mg/Ca ratios of the foraminiferal tests for reconstructing low-latitude ocean glacial-interglacial changes in sea surface temperatures (SST). We report herein a comparison of Mg/Ca measurements on sample pairs (n = 20) of two G. ruber (white) morphotypes (G. ruber sensu stricto (s.s.) and G. ruber sensu lato (s.l.)) from surface and downcore samples of the western Pacific and Indian Oceans. G. ruber s.s. refers to specimens with spherical chambers sitting symmetrically over previous sutures with a wide, high arched aperture, whereas G. ruber s.l. refers to a more compact test with a diminutive final chamber and small aperture. The G. ruber s.s. specimens generally show significantly higher Mg/Ca ratios compared to G. ruber s.l. Our results from the Mg/Ca ratio analysis suggest that G. ruber s.l. specimens precipitated their shells in slightly colder surface waters than G. ruber s.s. specimens. This conclusion is supported by the differences in delta18O and delta13C values between the two morphotypes. Although it is still unclear if these two morphotypes represent phenotypic variants or sibling species, our findings seem to support the hypothesis of depth and/or seasonal allopatry within a single morphospecies.

Project(s):

International Marine Global Change Study (IMAGES)

Coverage:

Median Latitude: 8.429706 * Median Longitude: 113.988217 * South-bound Latitude: -13.082500 * West-bound Longitude: 69.044667 * North-bound Latitude: 23.991800 * East-bound Longitude: 124.413000

Date/Time Start: 1986-05-10T00:00:00 * Date/Time End: 2001-05-24T16:34:00

Event(s):

GIK18381-1 * Latitude: 7.497000 * Longitude: 109.127000 * Date/Time: 1999-04-09T00:00:00 * Elevation: -213.0 m * Recovery: 0.37 m * Location: South China Sea * Campaign: (SÜDMEER III) * Basis: * Method/Device: Giant box corer (GKG)

GIK18387-1 * Latitude: 8.103000 * Longitude: 110.638000 * Date/Time: 1999-04-10T00:00:00 * Elevation: -381.0 m * Recovery: 0.39 m * Location: South China Sea * Campaign: (SÜDMEER III) * Basis: * Method/Device: Giant box corer (GKG)

GIK18393-1 * Latitude: 9.761000 * Longitude: 109.132000 * Date/Time: 1999-04-11T00:00:00 * Elevation: -155.0 m * Recovery: 0.44 m * Location: South China Sea * Campaign: (SÜDMEER III) * Basis: * Method/Device: Giant box corer (GKG)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

4 datasets

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Datasets listed in this publication series

Steinke, S; Chiu, H-Y; Yu, P-S et al. (2005): (Table 2) Stable Isotopes on two Globigerinoides ruber (white) morphotypes of sediment core MD01-2390. https://doi.org/10.1594/PANGAEA.394439
Steinke, S; Chiu, H-Y; Yu, P-S et al. (2005): (Table 1) Mg/Ca ratio and SST on Globigerinoides ruber (white) morphotypes of sediment core MD01-2390. https://doi.org/10.1594/PANGAEA.394441
Steinke, S; Chiu, H-Y; Yu, P-S et al. (2005): (Table 2) Stable isotopes on Globigerinoides ruber (white) morphotypes of surface samples from the western Pacific and Indian oceans. https://doi.org/10.1594/PANGAEA.394440
Steinke, S; Chiu, H-Y; Yu, P-S et al. (2005): (Table 1) Mg/Ca ratio and SST on Globigerinoides ruber (white) morphotypes of surface samples from the western Pacific and Indian oceans. https://doi.org/10.1594/PANGAEA.394442