Stable isotope and Mg/Ca record of Globigerinoides ruger morphotypes
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2005
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| _version_ | 1867170457683230720 |
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| author | Steinke, Stephan Chiu, Han-Yi Yu, Pai-Sen Shen, Chuan Chou Löwemark, Ludvig Mii, Horng-Sheng Chen, Min-Te |
| author_facet | Steinke, Stephan Chiu, Han-Yi Yu, Pai-Sen Shen, Chuan Chou Löwemark, Ludvig Mii, Horng-Sheng Chen, Min-Te |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_738255 |
| institution | PANGAEA |
| language | en |
| publishDate | 2005 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable isotope and Mg/Ca record of Globigerinoides ruger morphotypes Steinke, Stephan Chiu, Han-Yi Yu, Pai-Sen Shen, Chuan Chou Löwemark, Ludvig Mii, Horng-Sheng Chen, Min-Te Arabian Sea; Giant box corer; Giant piston corer; GIK18381-1; GIK18387-1; GIK18393-1; GIK18395-1; GKG; GPC; IMAGES; IMAGES VII - WEPAMA; International Marine Global Change Study; KAL; Kasten corer; KL-36, AS-04; Marion Dufresne (1995); MD012377; MD01-2377; MD012378; MD01-2378; MD012379; MD01-2379; MD012390; MD01-2390; MD012391; MD01-2391; MD012398; MD01-2398; MD122; SO140A; SO42; SO42-36KL; Sonne; South China Sea; SÜDMEER III; Timor Sea 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. |
| title | Stable isotope and Mg/Ca record of Globigerinoides ruger morphotypes |
| topic | Arabian Sea; Giant box corer; Giant piston corer; GIK18381-1; GIK18387-1; GIK18393-1; GIK18395-1; GKG; GPC; IMAGES; IMAGES VII - WEPAMA; International Marine Global Change Study; KAL; Kasten corer; KL-36, AS-04; Marion Dufresne (1995); MD012377; MD01-2377; MD012378; MD01-2378; MD012379; MD01-2379; MD012390; MD01-2390; MD012391; MD01-2391; MD012398; MD01-2398; MD122; SO140A; SO42; SO42-36KL; Sonne; South China Sea; SÜDMEER III; Timor Sea |
| url | https://doi.org/10.1594/PANGAEA.738255 |