Articles | Volume 20, issue 14
https://doi.org/10.5194/bg-20-3027-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-20-3027-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
28 Jul 2023
Research article |
| 28 Jul 2023
| 28 Jul 2023
Ultradian rhythms in shell composition of photosymbiotic and non-photosymbiotic mollusks
Dept. of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
Analytical, Environmental and Geochemistry group (AMGC), Vrije
Universiteit Brussel, Brussels, Belgium
Daniel Killam
Clean Water Program, San Francisco Estuary Institute, Richmond, CA, USA
Lukas Fröhlich
Institute of Geosciences, University of Mainz, Mainz, Germany
Lennart de Nooijer
Dept. of Ocean Systems, Royal Netherlands Institute for Sea Research (NIOZ), Texel, the Netherlands
Wim Boer
Dept. of Ocean Systems, Royal Netherlands Institute for Sea Research (NIOZ), Texel, the Netherlands
Bernd R. Schöne
Institute of Geosciences, University of Mainz, Mainz, Germany
Julien Thébault
Univ Brest, CNRS, IRD, Ifremer, LEMAR, Plouzané, France
Gert-Jan Reichart
Dept. of Ocean Systems, Royal Netherlands Institute for Sea Research (NIOZ), Texel, the Netherlands
Dept. of Earth Sciences, Utrecht University, Utrecht, the Netherlands
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The biogeochemical behaviour of shallow reef communities is quantified to better understand the impact of habitat degradation and species composition shifts on reef functioning. The reef communities investigated barely support reef functions that are usually ascribed to conventional coral reefs, and the overall biogeochemical behaviour is found to be similar regardless of substrate type. This suggests a decrease in functional diversity which may therefore limit services provided by this reef.
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Organic Fe speciation is investigated along a natural gradient of the western Antarctic Peninsula from an ice-covered shelf to the open ocean. The two major fronts in the region affect the distribution of ligands. The excess ligands not bound to dissolved Fe (DFe) comprised up to 80 % of the total ligand concentrations, implying the potential to solubilize additional Fe input. The ligands on the shelf can increase the DFe residence time and fuel local primary production upon ice melt.
Niels J. de Winter, Tobias Agterhuis, and Martin Ziegler
Clim. Past, 17, 1315–1340, https://doi.org/10.5194/cp-17-1315-2021, https://doi.org/10.5194/cp-17-1315-2021, 2021
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Climate researchers often need to compromise in their sampling between increasing the number of measurements to obtain higher time resolution and combining measurements to improve the reliability of climate reconstructions. In this study, we test several methods for achieving the optimal balance between these competing interests by simulating seasonality reconstructions using stable and clumped isotopes. Our results inform sampling strategies for climate reconstructions in general.
Ove H. Meisel, Joshua F. Dean, Jorien E. Vonk, Lukas Wacker, Gert-Jan Reichart, and Han Dolman
Biogeosciences, 18, 2241–2258, https://doi.org/10.5194/bg-18-2241-2021, https://doi.org/10.5194/bg-18-2241-2021, 2021
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Arctic permafrost lakes form thaw bulbs of unfrozen soil (taliks) beneath them where carbon degradation and greenhouse gas production are increased. We analyzed the stable carbon isotopes of Alaskan talik sediments and their porewater dissolved organic carbon and found that the top layers of these taliks are likely more actively degraded than the deeper layers. This in turn implies that these top layers are likely also more potent greenhouse gas producers than the underlying deeper layers.
Delphine Dissard, Gert Jan Reichart, Christophe Menkes, Morgan Mangeas, Stephan Frickenhaus, and Jelle Bijma
Biogeosciences, 18, 423–439, https://doi.org/10.5194/bg-18-423-2021, https://doi.org/10.5194/bg-18-423-2021, 2021
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Results from a data set acquired from living foraminifera T. sacculifer collected from surface waters are presented, allowing us to establish a new Mg/Ca–Sr/Ca–temperature equation improving temperature reconstructions. When combining equations, δ18Ow can be reconstructed with a precision of ± 0.5 ‰, while successive reconstructions involving Mg/Ca and δ18Oc preclude salinity reconstruction with a precision better than ± 1.69. A new direct linear fit to reconstruct salinity could be established.
Siham de Goeyse, Alice E. Webb, Gert-Jan Reichart, and Lennart J. de Nooijer
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Short summary
Short summary
The compositions of foraminifera shells often vary with environmental parameters such as temperature or salinity; thus, they can be used as proxies for these environmental variables. Often a single proxy is influenced by more than one parameter. Here, we show that while salinity impacts shell Na / Ca, temperature has no effect. We also show that the combination of different proxies (Mg / Ca and δ18O) to reconstruct salinity does not seem to work as previously thought.
Cited articles
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Short summary
Mollusk shells are valuable recorders of climate and environmental changes of the past down to a daily resolution. To explore this potential, we measured changes in the composition of shells of two types of bivalves recorded at the hourly scale: the king scallop Pecten maximus and giant clams (Tridacna) that engaged in photosymbiosis. We find that photosymbiosis produces more day–night fluctuation in shell chemistry but that most of the variation is not periodic, perhaps recording weather.
Mollusk shells are valuable recorders of climate and environmental changes of the past down to a...
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