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Aerobic anoxygenic phototrophs (AAPs) are known to couple light harvesting to heterotrophy and enter trophic relationships with algae in marine systems, suggesting they may represent an important but underexplored functional group in supraglacial ecosystems. Using genome-resolved analyses of supraglacial metagenomes and metatranscriptomes from Greenland, we recovered nine AAP metagenome-assembled genomes (MAGs) (4% of the 229 recovered MAGs) consistently enriched in bare ice and cryoconite communities, but nearly absent in snow. A meta-analysis of 2\u2009451 public metagenomes supported this cryospheric habitat association. AAP_MAGs were disproportionally enriched in thiosulfate oxidation and bicarbonate-dependent carbon assimilation pathways relative to other MAGs. Iron and CO oxidation pathways were broadly distributed across the GrIS microbiome, including in AAPs, together suggesting adaptation strategies in supraglacial ecosystems. Genomic evidence for algal coupling via sulfoquinovose degradation was limited. Overall, we document that AAPs are active and widespread in weathering crust habitats, highlighting their potential contributions to biogeochemical cycling in supraglacial ecosystems.<\/jats:p>","DOI":"10.1093\/femsec\/fiag116","type":"journal-article","created":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T11:54:44Z","timestamp":1791978884000},"source":"Crossref","is-referenced-by-count":0,"title":["Aerobic anoxygenic phototrophs are widespread and active members of Greenland Ice Sheet microbiomes"],"prefix":"10.1093","volume":"102","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5246-2640","authenticated-orcid":false,"given":"Christoph","family":"Keuschnig","sequence":"first","affiliation":[{"name":"Interface Geochemistry, GFZ Helmholtz Centre for Geosciences, 14473 Department Geochemistry, , Potsdam ,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-2484-1329","authenticated-orcid":false,"given":"Helen K","family":"Feord","sequence":"additional","affiliation":[{"name":"Interface Geochemistry, GFZ Helmholtz Centre for Geosciences, 14473 Department Geochemistry, , Potsdam ,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-6259-1800","authenticated-orcid":false,"given":"Emily L M","family":"Broadwell","sequence":"additional","affiliation":[{"name":"Aarhus University, 4000 Department of Environmental Science, , Roskilde ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4706-4023","authenticated-orcid":false,"given":"Athanasios","family":"Zervas","sequence":"additional","affiliation":[{"name":"Aarhus University, 4000 Department of Environmental Science, , Roskilde ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martyn","family":"Tranter","sequence":"additional","affiliation":[{"name":"Aarhus University, 4000 Department of Environmental Science, , Roskilde ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexandre M","family":"Anesio","sequence":"additional","affiliation":[{"name":"Aarhus University, 4000 Department of Environmental Science, , Roskilde ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9972-5578","authenticated-orcid":false,"given":"Liane G","family":"Benning","sequence":"additional","affiliation":[{"name":"Interface Geochemistry, GFZ Helmholtz Centre for Geosciences, 14473 Department Geochemistry, , Potsdam ,","place":["Germany"]},{"name":"Freie Universit\u00e4t Berlin, 12249 Department of Earth Sciences, , Berlin ,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,10,15]]},"reference":[{"key":"2026102612135336600_bib1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1038\/s41522-017-0019-0","article-title":"The microbiome of glaciers and ice sheets","volume":"3","author":"Anesio","year":"2017","journal-title":"npj Biofilms Microbiomes"},{"key":"2026102612135336600_bib2","doi-asserted-by":"publisher","DOI":"10.22008\/gpub\/32471","article-title":"PROMICE 2015: Report for the 2015 Operational Phase of the Programme for Monitoring of the Greenland Ice Sheet","author":"Andersen","year":"2016"},{"key":"2026102612135336600_bib3","volume-title":"rfPermute: estimate Permutation p-Values for Random Forest Importance Metrics","author":"Archer","year":"2026"},{"key":"2026102612135336600_bib4","doi-asserted-by":"publisher","first-page":"209","DOI":"10.1111\/j.1758-2229.2011.00323.x","article-title":"Bacterial anoxygenic photosynthesis on plant leaf surfaces: anoxygenic photosynthesis in the phyllosphere","volume":"4","author":"Atamna-Ismaeel","year":"2012","journal-title":"Environ Microbiol Rep"},{"key":"2026102612135336600_bib5","doi-asserted-by":"publisher","first-page":"2868","DOI":"10.1002\/hyp.8049","article-title":"High-resolution monitoring reveals dissolved oxygen dynamics in an Antarctic cryoconite hole","volume":"25","author":"Bagshaw","year":"2011","journal-title":"Hydrol Processes"},{"key":"2026102612135336600_bib6","doi-asserted-by":"publisher","first-page":"fiw076","DOI":"10.1093\/femsec\/fiw076","article-title":"Response of Antarctic cryoconite microbial communities to light","volume":"92","author":"Bagshaw\u00a0Elizabeth","year":"2016","journal-title":"FEMS Microbiol Ecol"},{"key":"2026102612135336600_bib7","doi-asserted-by":"publisher","first-page":"pgad421","DOI":"10.1093\/pnasnexus\/pgad421","article-title":"Aerobic iron-oxidizing bacteria secrete metabolites that markedly impede abiotic iron oxidation","volume":"2","author":"Baker","year":"2023","journal-title":"PNAS Nexus"},{"key":"2026102612135336600_bib8","doi-asserted-by":"publisher","first-page":"fuac006","DOI":"10.1093\/femsre\/fuac006","article-title":"How low can they go? 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