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Along the West Antarctic Peninsula (WAP), coastal snowfields receive nutrient inputs from marine and wildlife sources that may influence bloom development. We analyzed 111 snow samples collected from nine coastal WAP sites during the 2024\u20132025 austral summer to assess the relationships between dissolved nutrients and algal cell density, pigment concentration, and pigment composition across red, green, and clean snow. In green snow, median phosphate (PO\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>3\u2212<\/jats:sup>\n                    ) concentrations were tenfold higher (114\u00a0\u03bcM) relative to red snow (11.4\u00a0\u03bcM), and \u223c70\u2010fold higher than clean snow (1.54\u00a0\u03bcM). High\u2010phosphate samples, composed primarily of green snow, exhibited higher cell densities and per\u2010cell pigment concentrations than low\u2010phosphate samples, consistent with enhanced biomass and cellular pigment accumulation under phosphate\u2010rich conditions. These results identify green snow as a bloom state strongly associated with elevated phosphate availability. Green snow was also characterized by lower  ratios (NO\n                    <jats:sub>3<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    \u00a0+\u00a0NO\n                    <jats:sub>2<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    : PO\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>3\u2212<\/jats:sup>\n                    ) and increased photoprotective carotenoids relative to red snow, suggesting that dense green blooms rapidly drawdown bioavailable nitrogen relative to excess phosphate, creating a distinct post\u2010uptake stoichiometric signature in wildlife\u2010influenced regimes. Phosphate concentrations were positively associated with wildlife influence (Spearman's\n                    <jats:italic>r<\/jats:italic>\n                    \u00a0=\u00a00.54,\n                    <jats:italic>p<\/jats:italic>\n                    \u00a0&lt;\u00a00.001), indicating ornithogenic inputs as a key phosphorus source. Collectively, these results link phosphate availability to snow algal biomass and cellular pigment composition and suggest that wildlife\u2010mediated nutrient inputs may intensify algal\u2010driven surface darkening.\n                  <\/jats:p>","DOI":"10.1029\/2026jg009918","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T13:00:58Z","timestamp":1791378058000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Phosphate Enrichment From Wildlife Inputs Shapes the Distribution and Pigmentation of Green and Red Snow Algae Along the West Antarctic Peninsula"],"prefix":"10.1029","volume":"131","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-8704-3979","authenticated-orcid":false,"given":"Elise L.","family":"Ryan","sequence":"first","affiliation":[{"name":"Department of Environmental Sciences Western Washington University  Bellingham WA USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4425-1528","authenticated-orcid":false,"given":"Alia L.","family":"Khan","sequence":"additional","affiliation":[{"name":"Department of Environmental Sciences Western Washington University  Bellingham WA USA"},{"name":"Department of Aerospace Engineering Sciences University of Colorado  Boulder CO USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"13","published-online":{"date-parts":[[2026,10,7]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1101\/2024.07.24.604882"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/nph.70775"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1574\u20106941.2006.00198.x"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.micres.2016.07.004"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0954102016000031"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.2517\u20106161.1995.tb02031.x"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.3189\/172756405781813320"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1501615112"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1529\u20108817.1993.tb00143.x"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cub.2019.04.038"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1093\/femsec\/fiad088"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010019\u201012668\u20107"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010022\u201028560\u2010w"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature04056"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.3189\/S0260305500015792"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1111\/nph.15701"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598\u2010021\u201099202\u20102"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1029\/jc087ic06p04314"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1098\/rstb.2006.1955"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365\u20102486.2006.01108.x"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1007\/s13280\u2010010\u20100022\u20107"},{"key":"e_1_2_9_23_1","volume-title":"An R companion to applied regression (Third)","author":"Fox J.","year":"2019"},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00248\u2010009\u20109594\u20109"},{"key":"e_1_2_9_25_1","doi-asserted-by":"publisher","DOI":"10.1038\/ngeo3027"},{"key":"e_1_2_9_26_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010026\u201068625\u20108"},{"key":"e_1_2_9_27_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010020\u201016018\u2010w"},{"key":"e_1_2_9_28_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2023.166448"},{"key":"e_1_2_9_29_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598\u2010022\u201022271\u20104"},{"key":"e_1_2_9_30_1","doi-asserted-by":"publisher","DOI":"10.1111\/gbi.12219"},{"key":"e_1_2_9_31_1","doi-asserted-by":"publisher","DOI":"10.1007\/s002270050329"},{"key":"e_1_2_9_32_1","volume-title":"Hmisc: Harrell miscellaneous","author":"Harrell F. 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