Abstract
<p> <p id="x-x-sp0075"> Modern observations of planktic foraminifera from <a title="Learn more about sediment trap from ScienceDirect's AI-generated Topic Pages"> sediment trap </a> studies help to constrain the regional ecology of paleoceanographically valuable species. Results from a weekly-resolved sediment trap time series (2008–2014) in the northern <a title="Learn more about Gulf of Mexico from ScienceDirect's AI-generated Topic Pages"> Gulf of Mexico </a> demonstrate that 92% of <em> Globorotalia truncatulinoides </em> flux occurs in winter (January, February, and March), and that encrusted and non-encrusted individuals represent calcification in distinct depth habitats. We use individual foraminiferal analysis (IFA) of <em> G. truncatulinoides </em> tests to investigate differences in the elemental (Mg/Ca) and <a title="Learn more about isotopic composition from ScienceDirect's AI-generated Topic Pages"> isotopic composition </a> (δ <sup> 18 </sup> O and δ <sup> 13 </sup> C) of the encrusted and non-encrusted ontogenetic forms of <em> G. truncatulinoides </em> , and to estimate their calcification depth in the northern Gulf of Mexico. We estimate that non-encrusted and encrusted <em> G. truncatulinoides </em> have mean calcification depths of 66 ± 9 m and 379 ± 76 m, respectively. We validate the Mg/Ca-calcification temperature relationship for <em> G. truncatulinoides </em> and demonstrate that the δ <sup> 18 </sup> O and Mg/Ca of the non-encrusted form is a suitable proxy for winter surface mixed layer conditions in the Gulf of Mexico. Care should be taken not to combine encrusted and non-encrusted individuals of <em> G. truncatulinoides </em> for down core paleoceanographic studies. </p></p>
Original language | American English |
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Journal | Marine Micropaleontology |
Volume | 142 |
DOIs | |
State | Published - Jan 1 2018 |
Keywords
- Globorotalia truncatulinoides
- Gulf of Mexico
- Laser ablation
- Mg/Ca
- Planktic foraminifer
- Sediment trap
Disciplines
- Life Sciences