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We characterized microeukaryotic communities associated with microbialites, microbial mats, hypersaline waters, and sediments in the desiccating maar lake Rinc\u00f3n de Parangueo (central Mexico) using 18S rRNA gene amplicon sequencing. After quality filtering and rarefaction, 417 amplicon sequence variants (ASVs) belonging to 17 eukaryotic phyla were identified. Community composition differed among microhabitats, with mats harboring the highest number of exclusive genera and water containing the fewest. No genus was shared across all four microhabitats. The greatest taxonomic overlap occurred between mats and water, suggesting ecological connectivity between benthic and planktonic environments. Ordination analyses and environmental data indicated strong habitat filtering associated primarily with salinity and conductivity. Co\u2010occurrence network analysis revealed a highly modular community structure (Q\u2009=\u20090.789), with distinct habitat\u2010associated modules and limited connectivity among them. Chlorophyta dominated assemblages, particularly in microbialites and water, whereas Bacillariophyta, Amoebozoa, Discoba, Aphelidiomycota, and Rotifera were present. Recurrent taxa such as\n                    <jats:italic>Dunaliella<\/jats:italic>\n                    and\n                    <jats:italic>Picocystis<\/jats:italic>\n                    occupied central network positions. These results demonstrate strong microhabitat\u2010scale structuring and highlight the importance of fine\u2010scale environmental heterogeneity in shaping diversity within alkaline maar lakes.\n                  <\/jats:p>","DOI":"10.1111\/jeu.70127","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T09:47:42Z","timestamp":1791280062000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Microeukaryotic Diversity and Habitat Structuring in a Desiccating Alkaline Maar Lake (Central Mexico)"],"prefix":"10.1111","volume":"73","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4489-0055","authenticated-orcid":false,"given":"Barbara","family":"Moguel","sequence":"first","affiliation":[{"name":"Departamento de Ciencias Qu\u00edmica\u2010Biol\u00f3gica Universidad de las Am\u00e9ricas  Puebla M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9264-4553","authenticated-orcid":false,"given":"Mariano","family":"Cerca","sequence":"additional","affiliation":[{"name":"Instituto de Geociencias Universidad Nacional Aut\u00f3noma de M\u00e9xico  Quer\u00e9taro M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janet","family":"Sanchez\u2010Sanchez","sequence":"additional","affiliation":[{"name":"BioTechnology Institute University of Minnesota  St. Paul Minnesota USA"},{"name":"Department of Soil, Water, and Climate University of Minnesota  St. Paul Minnesota USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4712-5076","authenticated-orcid":false,"given":"Israel","family":"Mu\u00f1oz\u2010Velasco","sequence":"additional","affiliation":[{"name":"Departamento de Biolog\u00eda Celular, Facultad de Ciencias Universidad Nacional Aut\u00f3noma de M\u00e9xico  Ciudad de M\u00e9xico M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9465-1271","authenticated-orcid":false,"given":"Marina","family":"Vega\u2010Gonz\u00e1lez","sequence":"additional","affiliation":[{"name":"Instituto de Geociencias Universidad Nacional Aut\u00f3noma de M\u00e9xico  Quer\u00e9taro M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriela","family":"Olmedo\u2010\u00c1lvarez","sequence":"additional","affiliation":[{"name":"Departamento de Ingenier\u00eda Gen\u00e9tica Centro de Investigaci\u00f3n y de Estudios Avanzados del I.P.N., Campus Guanajuato  Irapuato M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,6]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.3390\/life14111425"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1144\/SP446.1"},{"key":"e_1_2_10_4_1","doi-asserted-by":"crossref","first-page":"169","DOI":"10.18268\/BSGM2013v65n1a13","article-title":"Active Sinking at the Bottom of the Rinc\u00f3n de Parangueo Maar (Guanajuato, M\u00e9xico) and Its Probable Relation With Subsidence Faults at Salamanca and Celaya","volume":"65","author":"Aranda\u2010G\u00f3mez J. 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