Articles | Volume 21, issue 9
https://doi.org/10.5194/cp-21-1661-2025
© 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/cp-21-1661-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
23 Sep 2025
Research article |
| 23 Sep 2025
| 23 Sep 2025
Edisto Inlet as a sentinel for Late Holocene environmental changes over the Ross Sea: insights from foraminifera turnover events
Department of Environmental Sciences, Informatics and Statistics, Ca' Foscari University of Venice, Via Torino 155, 30172 Venice, Italy
Department of Earth Sciences, University of Pisa, Via Santa Maria 53, 56126, Pisa, Italy
Katrine Elnegaard Hansen
Department of Near Surface Land and Marine Geology, The Geological Survey of Denmark and Greenland (GEUS), 8000 Aarhus C, Aarhus, Denmark
Caterina Morigi
Department of Earth Sciences, University of Pisa, Via Santa Maria 53, 56126, Pisa, Italy
Alessio Di Roberto
National Institute of Geophysics and Volcanology (INGV), Via Cesare Battisti 53, 56125, Pisa, Italy
Federico Giglio
National Institute of Polar Sciences (CNR-ISP), Via Piero Gobbetti 101, 40129, Bologna, Italy
Patrizia Giordano
National Institute of Polar Sciences (CNR-ISP), Via Piero Gobbetti 101, 40129, Bologna, Italy
Karen Gariboldi
Department of Earth Sciences, University of Pisa, Via Santa Maria 53, 56126, Pisa, Italy
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We examine benthic foraminiferal communities along an inner-to-outer transect in a fjord of Victoria Land. Community structure reflects organic matter flux, sedimentation rates, and circulation regimes. Inner sites show signs of stress, likely tied to oxygen depletion after sea-ice break up. Outer sites have higher densities, suggesting improved conditions. Comparison between paleocommunities and modern assemblages shows that communities are still recovering from late Holocene changes.
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Our study provides guidelines improving the reuse of marine microfossil assemblage data, which are valuable for understanding past ecosystems and environmental change. Based on a survey of 113 researchers, we identified key data attributes required for effective reuse. Analysis of a selection of datasets available online reveals a gap between the attributes scientists consider essential and the data currently available, highlighting the need for clearer data documentation and sharing practices.
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A sediment core was analysed, focusing over the 2000 years, in Edisto Inlet. Benthic and planktic foraminifera were picked and used to determine changes in the faunal composition. Using other nearby cores, by comparing different proxies, we were able to identify a succession of three different environmental phases over the studied period: a seasonal-cycle phase (from 2000 to around 1500 years BP), a transitional phase (from 1500 to 700 years BP) and a cold phase (from 700 years to present).
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We examine benthic foraminiferal communities along an inner-to-outer transect in a fjord of Victoria Land. Community structure reflects organic matter flux, sedimentation rates, and circulation regimes. Inner sites show signs of stress, likely tied to oxygen depletion after sea-ice break up. Outer sites have higher densities, suggesting improved conditions. Comparison between paleocommunities and modern assemblages shows that communities are still recovering from late Holocene changes.
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Short summary
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Our study provides guidelines improving the reuse of marine microfossil assemblage data, which are valuable for understanding past ecosystems and environmental change. Based on a survey of 113 researchers, we identified key data attributes required for effective reuse. Analysis of a selection of datasets available online reveals a gap between the attributes scientists consider essential and the data currently available, highlighting the need for clearer data documentation and sharing practices.
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A sediment core was analysed, focusing over the 2000 years, in Edisto Inlet. Benthic and planktic foraminifera were picked and used to determine changes in the faunal composition. Using other nearby cores, by comparing different proxies, we were able to identify a succession of three different environmental phases over the studied period: a seasonal-cycle phase (from 2000 to around 1500 years BP), a transitional phase (from 1500 to 700 years BP) and a cold phase (from 700 years to present).
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Short summary
In the Edisto Inlet, Ross Sea, over the last 3.6 kyr, a marked transition at 2.7–2.5 kyr BP occurred. Geochemical proxies and changes in the foraminiferal community suggest a change from multi-year to seasonal sea ice, likely linked to mCDW (modified Circumpolar Deep Water) intrusion. The study integrates ecological information and geochemical data to unveil connections between mCDW, sea-ice conditions and the SAM (Southern Annular Mode) in Edisto, highlighting it as a key site for regional paleoclimate reconstruction over the Ross Sea.
In the Edisto Inlet, Ross Sea, over the last 3.6 kyr, a marked transition at 2.7–2.5 kyr BP...
