CAGE21-2 Cruise Report: Planktic foraminifera sampling for culturing experiments, central Greenland Sea 75°N

Ezat, Mohamed; Meilland, Julie; Westgård, Adele; Chalk, Thomas B.; Rasmussen, Tine L.; Altuna, Naima El bani; Lockwood-Ireland, Christine

doi:10.7557/cage.6714

Cited by 2 publications

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“…Specimens of N. pachyderma ( Darling et al. , 2006 ) were sampled from the East Greenland Sea (74.47°N, 01.56°E) using a WP2 plankton net (63 μm mesh, HydroBios), from vertical towing during the CAGE21-2 cruise ( Ezat et al. , 2021 ).…”

Section: Methodsmentioning

confidence: 99%

Large-scale culturing of Neogloboquadrina pachyderma, its growth in, and tolerance of, variable environmental conditions

WestgÅrd,

Ezat,

Chalk

et al. 2023

Journal of Plankton Research

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The planktic foraminifera Neogloboquadrina pachyderma is a calcifying marine protist and the dominant planktic foraminifera species in the polar oceans, making it a key species in marine polar ecosystems. The calcium carbonate shells of foraminifera are widely used in palaeoclimate studies because their chemical composition reflects the seawater conditions in which they grow. This species provides unique proxy data for past surface ocean hydrography, which can provide valuable insight to future climate scenarios. However, little is known about the response of N. pachyderma to variable and changing environmental conditions. Here, we present observations from large-scale culturing experiments where temperature, salinity and carbonate chemistry were altered independently. We observed overall low mortality, calcification of new chambers and addition of secondary calcite crust in all our treatments. In-culture asexual reproduction events also allowed us to monitor the variable growth of N. pachyderma’s offspring. Several specimens had extended periods of dormancy or inactivity after which they recovered. These observations suggest that N. pachyderma can tolerate, adapt to and calcify within a wide range of environmental conditions. This has implications for the species-level response to ocean warming and acidification, for future studies aiming to culture N. pachyderma and use in palaeoenvironmental reconstruction.

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Section: Methodsmentioning

confidence: 99%

Large-scale culturing of Neogloboquadrina pachyderma, its growth in, and tolerance of, variable environmental conditions

WestgÅrd,

Ezat,

Chalk

et al. 2023

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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CAGE21-2 Cruise Report: Planktic foraminifera sampling for culturing experiments, central Greenland Sea 75°N

Cited by 2 publications

References 0 publications

Large-scale culturing of Neogloboquadrina pachyderma, its growth in, and tolerance of, variable environmental conditions

Large-scale culturing of Neogloboquadrina pachyderma, its growth in, and tolerance of, variable environmental conditions

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

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