Correction to: Do Skeletal Mg/Ca Ratios of Arctic Rhodoliths Reflect Atmospheric CO2 Concentrations?

Teichert, Sebastian; Voigt, Nora; Wisshak, Max

doi:10.1007/s00300-021-02906-4

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“…These increments with alternating lower and higher Mg contents correspond to different structures within the thallus with more calcified, smaller cells deposited in winter and larger, less calcified cells deposited in summer. Since, as previously stated, the Mg content is, amongst others such as light and CO 2 [50], driven by changes in water temperature, summer cells have a higher Mg content than the winter cells. It is possible that the seasonal temperature difference was not enough for making a substantial difference in Mg uptake by the algae.…”

Section: Elemental Mapsmentioning

confidence: 65%

“…Overall, SrCO 3 correlates with MgCO 3 (MgCO 3 = 33.47 × SrCO 3 ; r 2 = 0.89) in our EMP-dataset, and both had been suggested as temperature proxies [49]. However, in the ontogenetic transect (Figure 7), the curves of SrCO 3 and MgCO 3 lack similarities, which again points to vital effects that outcompete temperature signals at the microscale [50].…”

Section: Discussionmentioning

confidence: 76%

“…For a robust temperature calibration, marked-recaptured thalli with known growth duration are required, along with a replicate sampling within the same thallus and the thalli of further adjacent specimens. Moreover, it has been shown that the Mg/Ca ratio in CCA is not only impacted by temperature, but also by the available light as well as by pCO 2 [7, 49,50].…”

Section: Discussionmentioning

confidence: 99%

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Structural and Geochemical Assessment of the Coralline Alga Tethysphytum antarcticum from Terra Nova Bay, Ross Sea, Antarctica

et al. 2023

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Crustose coralline algae (CCA) occur from the tropics to the poles in photic benthic environments. Here, we report on some of the world’s southernmost and coldest CCA sites in Terra Nova, Ross Sea, Antarctica at 74°41′ S. The recently described red alga Tethysphytum antarticum is investigated for its skeletal architecture, its mineralogical and geochemical composition, as well as for its taxonomic classification. A phylogenetic analysis based on molecular genetics and the sequencing of the photosystem II protein D1 (psbA) gave a perfect match with T. antarcticum. Histological sections and micro-CT-scans provide new diagnostic details for the conceptacles (the reproductive organs of the alga). X-ray diffractometry and electron-microprobe measurements yielded a clear high-Mg calcite (~8 mol%) composition of the skeletal parts. Detailed back-scattered electron imaging of polished petrographic thin sections revealed a two-layered thallus (vegetative plant tissue), comprising an organic-rich irregularly calcified basal layer with rectangular cells, overlain by the main thallus. Elemental maps show relatively increased sulphur in the basal layer, clearly tied to organic cell walls. MgCO3 and SrCO3 were targeted with semiquantitative elemental mappings and in an ontogenetic quantitative spot transect. Compared with temperature (−1.95 °C to +1.08 °C), the MgCO3 (mol%) reflects this world’s coldest CCA site temperature with the lowest MgCO3 content of 7.9 ± 1.6 mol%. The along transect variability, however, shows with ~6 mol% a larger MgCO3 variability than expected for the 3 °C intra-annual temperature amplitude in Terra Nova Bay. This implies that in low amplitude settings the biomineralisation control on Mg/Ca ratios can outcompete its temperature sensitivity. Mark-recapture studies, next to the environmental logger station La Zecca are suggested, to perform a detailed growth rate and biomineralisation quantification.

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Section: Elemental Mapsmentioning

confidence: 65%

Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

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