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Biogeochemistry of selenium compounds in the water column of warm monomictic Lake Kinneret

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Abstract

The biogeochemistry of dissolved selenium (Se) was investigated over 3 years (2015–2017) in the subtropical, warm monomictic and meso-eutrophic Lake Kinneret (Sea of Galilee, Israel). We monitored seasonal variation and vertical distribution of dissolved total Se (T.Se), inorganic oxyanions (Se(IV) & Se(VI)), reduced Se fraction (Red.Se), organic (Org.Se) and volatile Se compounds. T.Se varied between ~ 100 and 160 ng L−1 with Red.Se comprising 40–80% of the Se inventory, and Se(VI) dominating over Se(IV) most of the time. The variation in T.Se and species correlated with winter holomixis vs. summer fall stratification periods. The annual cycle includes: (a) increase of T.Se from fall/winter to spring, representing increased allochthonous Se input flux, along with Se recycling via holomixis; (b) decrease of T.Se from spring to the end of the year, representing the diminishing Se inputs and the evolving output fluxes to the lake’s bottom and to the atmosphere. Org.Se variations are directly associated with Chlorophyll-a and primary production attesting for the significant role of phytoplankton activity in the Se cycle. An important Se output flux comprises spring to summer Se uptake by phytoplankton and further volatile compounds production and volatilization accounting for ~ 10% of estimated Se input. The similarity of total dissolved Se concentrations in this work and from mid 1990s attests for long-term stability of the Se inventory. The TVSe concentrations in lacustrine systems being similar to that of estuary systems, the biological role of phytoplankton and eventually the degradation of organic material may produce similar fluxes of volatile Se to the atmosphere.

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Data collected and used in this manuscript are available in supplementary information file.

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Acknowledgements

Y. Be’eri-Shlevin wishes to dedicate this paper to D. Solnik.

Funding

The research leading to these results received funding from the Israeli Water Authority (grant #4500963096) and, Aquitaine Region (AQUITRACES Project n° 20131206001–13010973) & ANR IA RSNR (AMORAD project n°ANR-11-RSNR-0002) for equipment funding. The financial support of A. Romero—Rama Doctoral fellowship was received from UPPA and IPREM.

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YB-S: Conceptualization, Investigation, Resources, Writing-original draft, Writing-review & editing, Funding acquisition. MB: Conceptualization, Investigation, Validation, Writing-original draft, Writing-review & editing, Funding acquisition. ET: Conceptualization, Investigation, Validation, Writing-review & editing. AR-R: Conceptualization, Formal analysis, Writing-original draft. AS: Conceptualization, Investigation, Resources, Writing-review & editing, Funding acquisition. TZ: Conceptualization, Resources, Writing-original draft, Writing-review & editing, Funding acquisition. DA: Conceptualization, Writing-original draft, Writing-review & editing, Funding acquisition.

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Correspondence to M. Bueno.

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Responsible Editor: R. Kelman Wieder.

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Be’eri-Shlevin, Y., Bueno, M., Tessier, E. et al. Biogeochemistry of selenium compounds in the water column of warm monomictic Lake Kinneret. Biogeochemistry 157, 291–311 (2022). https://doi.org/10.1007/s10533-021-00877-6

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  • DOI: https://doi.org/10.1007/s10533-021-00877-6

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