Articles | Volume 22, issue 23
https://doi.org/10.5194/bg-22-7669-2025
© Author(s) 2025. 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-22-7669-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| Highlight paper
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05 Dec 2025
Research article | Highlight paper |
| 05 Dec 2025
| 05 Dec 2025
The influence of irradiance and interspecific differences on δ11B, δ13C and elemental ratios in four coralline algae complexes from Aotearoa, New Zealand
Maxence Guillermic
CORRESPONDING AUTHOR
Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, Center for Diverse Leadership in Science, University of California, Los Angeles, CA 90095, USA
Erik C. Krieger
School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
Red Sea Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
Joyce Goh
Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, Center for Diverse Leadership in Science, University of California, Los Angeles, CA 90095, USA
Christopher E. Cornwall
School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, Center for Diverse Leadership in Science, University of California, Los Angeles, CA 90095, USA
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The authors present very clear results from a well-designed experiment to show the impact of light on the isotopic composition of coralline algae, an important paleo-archive for high-latitude climate reconstructions. The results have implications for pH and temperature reconstructions and also shed light on biomineralization. The experimental set-up used is applicable on various other photosynthetic or photosymbiotic biocalcifiers and is therefore of wider interest to the biogeosciences audience.
The authors present very clear results from a well-designed experiment to show the impact of...
Short summary
We address the impact of light on four complexes of coralline red algae using boron and carbon isotopic signatures. We show that the four complexes up-regulated their δ11B derived pHCF relative to seawater by 0.6 to 0.8 pH unit but pHCF was not directly impacted by light at the complex level. The differences in calcification between encrusting and branching complexes result from different photosynthetic regimes and carbon concentrating mechanisms, which would be inherent to morphologies.
We address the impact of light on four complexes of coralline red algae using boron and carbon...
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