PANGAEA_967722 The effect of light, iron and manganese supply on phytoplankton community composition in the Weddell Sea Balaguer, Jenna; Koch, Florian; Trimborn, Scarlett The effect of light, iron and manganese supply on phytoplankton community composition in the Weddell Sea 2024-08-13 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.967722 Investigator Jenna Balaguer jbalaguer@geomar.de Earth Science Event label Type of study Treatment: nutrients Treatment: light intensity Incubation duration Size fraction Chlorophyll a Carbon, organic, particulate, population yield geoscientificInformation Diatom assemblage In situ pump Primary production PS124 PS124_5-5 PS124_68-1 Trace metal Weddell Sea Measured Polarstern 2021-02-08 2021-02-28 Complete -76.09976 -70.41772 -30.38305 -30.00196 SPP1158 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 391 data points text/tab-separated-values Balaguer, Jenna; Koch, Florian; Flintrop, Clara; Völkner, Christian; Iversen, Morten Hvitfeldt; Trimborn, Scarlett (2023): Effect of iron and manganese supply on a natural phytoplankton community of the Weddell Sea and further consequence for carbon export [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.957278

This study highlights the importance of manganese (Mn) next to iron (Fe) for the growth of specific Southern Ocean phytoplankton groups with important implications for primary production in the Weddell Sea. Two Fe-Mn-light bottle amendment experiment were performed with a natural phytoplankton community during Polarstern expedition PS124 in 2021 in the Weddell Sea. At this location, seawater was pumped (using trace metals clean techniques) from 25m depth to fill polycarbonate bottles. The Control treatment consisted of the sampled seawater without any trace metals addition, while the other three treatments were enriched with either FeCl3 alone (0.5 nM; +Fe treatment) or MnCl2 alone (1 nM; +Mn treatment) or both trace metals together (+FeMn treatment). All treatments were done in triplicate 2,5L PC bottles under 2 light regimes (30 and 100 µmol photon m-2 s-1). After on average 7 days, samples for chlorophyll a content, particulate organic carbon, primary production flow cytometry and light microscopy were taken to detect FeMn co-limitation effect on species composition and primary production. While results showed with high confidence that both communities were Fe-limited, no evidence was found that low light provoked a stronger response to Fe supply. Nevertheless, under low light, microscopic analysis at both locations revealed Fe-Mn co-limitation of a key phytoplankton group: Fragilariopsis sp., which numerically dominated the diatom communities. Our findings highlight that in response to light limitation, some key species may suffer from Fe-Mn co-limitation with subsequent implications for the biological carbon pump. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.967722"!

https://doi.org/10.17815/jlsrf-3-163 Polarstern https://doi.org/10.48433/BzPM_0755_2021 PS124 https://doi.pangaea.de/10.1594/PANGAEA.957278 Effect of iron and manganese supply on a natural phytoplankton community of the Weddell Sea and further consequence for carbon export https://gepris.dfg.de/gepris/projekt/5472008 SPP1158 https://hdl.handle.net/10013/epic.32187.d001 Chlorophyll a DIF 9.4 2024-08-13 2026-02-27