Morphological, geochemical, and ecological differences of the extant menardiform planktonic foraminifera Globorotalia menardii and Globorotalia cultrata

Regenberg, M., Nielsen, Sven N., Kuhnt, W., Holbourn, A., Garbe-Schönberg, D. and Andersen, N. (2010) Morphological, geochemical, and ecological differences of the extant menardiform planktonic foraminifera Globorotalia menardii and Globorotalia cultrata Marine Micropaleontology, 74 (3-4). pp. 96-107. DOI 10.1016/j.marmicro.2010.01.002.

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Abstract

Taxonomic consistency is the prerequisite for any foraminiferal study. In particular, interpretation of planktonic foraminiferal geochemical data requires consistent selection of monospecific tests due to varying habitats of different species. In order to exemplify the impact of slightly varying morphological characteristics on geochemical signatures, we investigated three basic shape dimensions, test weights, stable isotope values, and Mg/Ca ratios of Globorotalia menardii and Globorotalia cultrata, which are often grouped or referred to as synonyms. Along with visual distinction, encrusted G. menardii is distinguished from shiny G. cultrata by its on average doubled test weight, when referring to the same maximum diameter. More elongated and flattened G. cultrata calcifies within the deeper mixed layer, which applies also for the initial calcification of G. menardii. Final encrustration of G. menardii after vertical migration is suggested to take place close to the bottom of the seasonal thermocline. Combined Mg/Ca ratios versus calcification temperature calibration provides a reliable tool for monospecific thermal reconstructions for the seasonal thermocline (G. menardii) and the deeper mixed layer (G. cultrata). (C) 2010 Elsevier B.V. All rights reserved.

Document Type: Article
Keywords: Globorotalia menardii Globorotalia cultrata Mg/Ca ratios delta(18)O values delta(13)C values Morphometrics Calcification-temperature calibration Thermocline temperature Mixed-layer temperature south china sea recent benthic foraminifera oxygen isotopic composition time-series site vertical-distribution north-atlantic panama basin sunda shelf surface productivity seasonal variability
Research affiliation: Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Geosciences
Kiel University > Other > Leibniz-Laboratory for Radiometric Dating and Isotope Research
Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Geosciences
UNSPECIFIED
Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Geosciences
Kiel University > Other > Leibniz-Laboratory for Radiometric Dating and Isotope Research
DOI etc.: 10.1016/j.marmicro.2010.01.002
ISSN: 0377-8398
Date Deposited: 22 Dec 2011 05:22
Last Modified: 08 Oct 2012 10:00
URI: http://eprints.uni-kiel.de/id/eprint/15710

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