{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T17:52:47Z","timestamp":1785433967420,"version":"3.56.0"},"posted":{"date-parts":[[2025,12,1]]},"group-title":"Evolutionary Biology","reference-count":193,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2025,12,1]],"date-time":"2025-12-01T00:00:00Z","timestamp":1764547200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"id":[{"id":"https:\/\/ror.org\/021nxhr62","id-type":"ROR","asserted-by":"publisher"}]},{"id":[{"id":"https:\/\/ror.org\/01cwqze88","id-type":"ROR","asserted-by":"publisher"}]},{"id":[{"id":"https:\/\/ror.org\/003thv661","id-type":"ROR","asserted-by":"publisher"}]},{"id":[{"id":"https:\/\/ror.org\/00dxqqk95","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Duke University Population Research Institute"},{"name":"University of Notre Dame Eck Institute for Global Health"},{"name":"University of Notre Dame Environmental Change Initiative"},{"DOI":"10.13039\/501100007768","name":"Max Planck Institute for Evolutionary Anthropology","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100007768","id-type":"DOI","asserted-by":"crossref"}]},{"id":[{"id":"https:\/\/ror.org\/00py81415","id-type":"ROR","asserted-by":"publisher"}]},{"id":[{"id":"https:\/\/ror.org\/00mkhxb43","id-type":"ROR","asserted-by":"publisher"}]},{"id":[{"id":"https:\/\/ror.org\/00hx57361","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2026,6,15]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                <jats:sec>\n                  <jats:title>Background<\/jats:title>\n                  <jats:p>In humans and other mammals, female reproduction is linked to extensive changes in physiology, immunity, hormones, and behavior. These changes likely shape, and may be shaped by, the composition of gut microbial communities. Characterizing the dynamics of gut microbial change across reproductive states, including its relationship to female physiology, is important for understanding how the gut microbiota influences female and offspring health.<\/jats:p>\n                <\/jats:sec>\n                <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>Here we characterize longitudinal changes in gut microbiota across reproduction by combining 16S rRNA gene sequencing data from 4,462 stool samples (spanning 14 years of sample collection) with life history data on multiple reproductive events in 169 female baboons. These baboons were members of a well-studied, natural baboon population in Kenya where reproductive state (ovarian cycling, pregnancy, and postpartum amenorrhea) is tracked daily and microbiota data could be paired with measurements of fecal-derived estrogen, progesterone, and glucocorticoid levels. We found extensive changes in baboon gut microbiota as females transitioned between reproductive states. Pregnancy was linked to distinct patterns of ASV richness, community composition, and taxonomic abundances compared to postpartum amenorrhea and ovarian cycling. The most dramatic shifts occurred as females transitioned from the first to second trimester of pregnancy, with altered abundances of taxa that have been linked, in humans and model systems, to host immunity, weight gain, or hormone levels. Host identity was consistently the strongest predictor of gut microbiota composition across states, and this individual signature was strongest during pregnancy. Estrogen and progesterone levels had robust associations with the gut microbiota overall, but the microbial taxa involved in these associations were reproductive state-dependent. Glucocorticoid concentrations were not a major predictor of gut microbiota composition in any state.<\/jats:p>\n                <\/jats:sec>\n                <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>Together, our results support the idea that gut microbiota contribute to the complex physiological changes necessary during pregnancy, but that microbial changes during pregnancy are somewhat unique to each female. Variation in steroid hormones is associated with some, but not all, of these relationships, emphasizing the importance of considering steroid hormone levels in studies of gut microbiota variation. Our results motivate future work on how gut microbiota contribute to reproductive outcomes, including both maternal and offspring health.<\/jats:p>\n                <\/jats:sec>","DOI":"10.1101\/2025.12.01.691429","type":"posted-content","created":{"date-parts":[[2025,12,2]],"date-time":"2025-12-02T02:05:29Z","timestamp":1764641129000},"source":"Crossref","is-referenced-by-count":0,"title":["Longitudinal changes in gut microbiota across reproductive states in wild baboons"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4713-4279","authenticated-orcid":false,"given":"Chelsea A.","family":"Southworth","sequence":"first","affiliation":[{"name":"Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-5011-6385","authenticated-orcid":false,"given":"Logan","family":"Barrios","sequence":"additional","affiliation":[{"name":"Biomedical Engineering Program, University of Colorado, Boulder, CO, USA"},{"name":"Interdisciplinary Quantitative Biology Program, BioFrontiers Institute, University of Colorado, Boulder, CO, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1956-2500","authenticated-orcid":false,"given":"Mauna R.","family":"Dasari","sequence":"additional","affiliation":[{"name":"California Academy of Sciences, San Francisco, CA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7721-526X","authenticated-orcid":false,"given":"Laurence R.","family":"Gesquiere","sequence":"additional","affiliation":[{"name":"Department of Biology, Duke University, Durham, NC, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7920-7001","authenticated-orcid":false,"given":"Jack A.","family":"Gilbert","sequence":"additional","affiliation":[{"name":"Scripps Institution of Oceanography, University 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