CAGE-ARCLIM cruise: Culturing (sub)Arctic planktic foraminifera Neogloboquadrina pachyderma and Globigerina bulloides: Implications for ocean acidification and paleoceanography reconstructions

Ezat, Mohamed; Meilland, Julie; Westgård, Adele; Chalk, Thomas B.; Sykes, Freya E; Altuna, Naima El bani; Nadar, Pushpak; Tell, Franziska; Vega, Elwyn de la

doi:10.7557/cage.6768

Cited by 2 publications

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“…Sampling was carried out in late June 2022 onboard RV Helmer Hanssen in the Norwegian Sea ( Ezat et al., 2022 ). Physical variables (salinity and temperature) were measured in seawater collected from 68 o 14’N 10 o 12’E at 150 m water depth using a Conductivity-Temperature-Depth CTD (Seabird-911 Plus) Rosette system equipped with twelve 10-L Niskin bottles.…”

Section: Methodsmentioning

confidence: 99%

Large-scale culturing of the subpolar foraminifera Globigerina bulloides reveals tolerance to a large range of environmental parameters associated to different life-strategies and an extended lifespan

Sykes,

Meilland,

Westgård

et al. 2024

Journal of Plankton Research

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The subtropical to subpolar planktic foraminifera Globigerina bulloides is a calcifying marine protist, and one of the dominant foraminiferal species of the Nordic Seas. Previously, the relative abundance and shell geochemistry of fossil G. bulloides have been studied for palaeoceanographic reconstructions. There is however a lack of biological observations on the species and a poor understanding of its ecological tolerances, especially for high latitude genotypes. Here, we present observations from the first extensive culturing of G. bulloides under subpolar conditions, including the first low temperature (6–13°C) and variable salinity (30–38) experiments. Carbonate chemistry (pH and [CO32−]) was also manipulated. Experimental conditions were chosen to reflect a range of plausible past and future scenarios for the Nordic Seas. We found G. bulloides to be tolerant of environmental conditions well outside their optimal range (<10°C, salinity <33, pH <8). Observed life span was up to three months, which was attributed to a microalgal diet. Two alternative life strategies were employed, whereby individuals either experienced rapid growth and death, or a prolonged lifespan with minimal growth and death via slow decay. We posit this could help explain differences in geochemical signals recorded from different size fractions of fossil specimens used for palaeoceanographic reconstructions.

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Section: Methodsmentioning

confidence: 99%

Large-scale culturing of the subpolar foraminifera Globigerina bulloides reveals tolerance to a large range of environmental parameters associated to different life-strategies and an extended lifespan

Sykes,

Meilland,

Westgård

et al. 2024

Journal of Plankton Research

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Uncovering hidden structures: previously undescribed pseudopodia and ectoplasmic structures in planktonic foraminifera

Greco

Westgård

Sykes

et al. 2023

Journal of Plankton Research

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The trophic strategies of cold-water planktonic foraminifera are not well understood due to the challenge of culturing them in polar conditions. Here, we identify previously unknown ectoplasmic and cytoplasmic projections in three species of planktonic foraminifera thriving in polar and subpolar marine environments: Globigerina bulloides, Neogloboquadrina incompta and Neogloboquadrina pachyderma. These structures were observed during routine monitoring of cultured specimens sampled from the Norwegian coast, Greenland Sea and Baffin Bay. Two types of projections were discovered, including permanent and non-permanent structures such as ectoplasmic roots, twigs and twig-like projections, similar to those observed in benthic taxa Cibicides and Cibicidoides. Additionally, a previously undescribed filopodia-like projection was observed in N. pachyderma. We discuss the function, the ecological significance and the potential impact on pelagic processes of the presence of these structures in foraminifera species that occupy diverse niches in the water column. Our findings suggest that these structures may play an important role in the trophic strategies of cold-water planktonic foraminifera, and further research and observations are necessary to fully comprehend their significance in the carbon cycle.

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CAGE-ARCLIM cruise: Culturing (sub)Arctic planktic foraminifera Neogloboquadrina pachyderma and Globigerina bulloides: Implications for ocean acidification and paleoceanography reconstructions

Cited by 2 publications

References 0 publications

Large-scale culturing of the subpolar foraminifera Globigerina bulloides reveals tolerance to a large range of environmental parameters associated to different life-strategies and an extended lifespan

Large-scale culturing of the subpolar foraminifera Globigerina bulloides reveals tolerance to a large range of environmental parameters associated to different life-strategies and an extended lifespan

Uncovering hidden structures: previously undescribed pseudopodia and ectoplasmic structures in planktonic foraminifera

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