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The factors that ultimately limit productivity in these systems can vary, but nitrogen (N) cycling in particular has been shown to be adversely affected by high salinity, evidently due to the inhibition of nitrifying bacteria (i.e., those that convert ammonic species to nitrogen oxides). The coastal plain of Coorong National Park in South Australia, which hosts several alkaline lakes along 130\u2009km of coastline, provides an ideal natural laboratory for examining how fine\u2010scale differences in the geochemistry of such environments can lead to broad variations in nitrogen cycling through time, as manifest in sedimentary \u03b4<jats:sup>15<\/jats:sup>N. Moreover, the lakes provide a gradient of aqueous conditions that allows us to assess the effects of pH, salinity, and carbonate chemistry on the sedimentary record. We report a wide range of \u03b4<jats:sup>15<\/jats:sup>N values (3.8\u2030\u201318.6\u2030) measured in the sediments (0\u201335\u2009cm depth) of five lakes of the Coorong region. Additional data include major element abundances, carbonate \u03b4<jats:sup>13<\/jats:sup>C and \u03b4<jats:sup>18<\/jats:sup>O values, and the results of principal component analyses. Stable nitrogen isotopes and wt% sodium (Na) display positive correlation (<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup>\u2009=\u20090.59, <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001) across all lake systems. Principal component analyses further support the notion that salinity has historically impacted nitrogen cycling. We propose that the inhibition of nitrification at elevated salinity may lead to the accumulation of ammonic species, which, when exposed to the water column, are prone to ammonia volatilization facilitated by intervals of elevated pH. This process is accompanied by a significant isotope fractionation effect, isotopically enriching the nitrogen that remains in the lake water. This nitrogen is eventually buried in the sediments, preserving a record of these combined processes. Analogous enrichments in the rock record may provide important constraints on past chemical conditions and their associated microbial ecologies. Specifically, ancient terrestrial aquatic systems with high \u03b4<jats:sup>15<\/jats:sup>N values attributed to denitrification and thus oxygen deficiency may warrant re\u2010evaluation within the framework of this alternative. Constraints on pH as provided by elevated \u03b4<jats:sup>15<\/jats:sup>N via ammonia volatilization may also inform critical aspects of closed\u2010basin paleoenvironments and their suitability for a de novo origin of life.<\/jats:p>","DOI":"10.1111\/gbi.70018","type":"journal-article","created":{"date-parts":[[2025,4,5]],"date-time":"2025-04-05T16:35:24Z","timestamp":1743870924000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Elevated <scp>\u03b4<sup>15<\/sup>N<\/scp> Linked to Inhibited Nitrification Coupled to Ammonia Volatilization in Sediments of Shallow Alkaline\u2010Hypersaline Lakes"],"prefix":"10.1111","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4686-3130","authenticated-orcid":false,"given":"Christopher J.","family":"Tino","sequence":"first","affiliation":[{"name":"Department of Earth and Planetary Sciences University of California  Riverside California USA"},{"name":"Department of Earth, Energy, and Environment University of Calgary  Calgary Alberta Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eva E.","family":"St\u00fceken","sequence":"additional","affiliation":[{"name":"School of Earth and Environmental Sciences University of St. Andrews  St. Andrews UK"},{"name":"Virtual Planetary Laboratory University of Washington  Seattle Washington USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel D.","family":"Gregory","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences University of Toronto  Toronto Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Timothy W.","family":"Lyons","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Sciences University of California  Riverside California USA"},{"name":"Virtual Planetary Laboratory University of Washington  Seattle Washington USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,4,4]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1515\/9780691209401"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1039\/C3AY41907J"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/rcm.2159"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chemgeo.2023.121814"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-019-11834-1"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.aax1420"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.3390\/min11020106"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1093\/oso\/9780195133530.003.0005"},{"key":"e_1_2_10_10_1","first-page":"C1","volume-title":"Geochemical, Biogeochemical, and Sedimentological Studies of the Green River Formation, Wyoming, Utah, and Colorado","author":"Collister J. 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