AUTHOR=Grabski Michał , Kotlarska Ewa , Łuczkiewicz Aneta , Hryniewicz Konrad , Węgrzyn Grzegorz , Szymczycha Beata TITLE=Spatial and seasonal distribution of selected nitrogen cycle genes in deep waters of the Baltic Proper JOURNAL=Frontiers in Marine Science VOLUME=12 YEAR=2025 URL=https://www.frontiersin.org/journals/marine-science/articles/10.3389/fmars.2025.1456825 DOI=10.3389/fmars.2025.1456825 ISSN=2296-7745