{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,13]],"date-time":"2026-07-13T06:10:58Z","timestamp":1783923058483,"version":"3.55.0"},"reference-count":127,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,7,13]],"date-time":"2026-07-13T00:00:00Z","timestamp":1783900800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Microbiomes"],"abstract":"<jats:p>\n                    One of the major consequences of a phytoplanktonic bloom is the massive release of autochthonous organic matter (OM) into the water column, stimulating heterotrophic microbial activity and disrupting the trophic web. To better understand the consequences of such biotic stress, the senescent phase of a bloom was simulated under semi-controlled conditions through the addition of cyanobacterial-derived OM from\n                    <jats:italic>Microcystis aeruginosa<\/jats:italic>\n                    and\n                    <jats:italic>Aphanizomenon gracile<\/jats:italic>\n                    (30% enrichment as eq C) into lake water mesocosms. By following both\u00a0the autochthonous OM and the microbial communities during 28 days, we\u00a0observed that both cyanobacterial-derived OM differed qualitatively (displaying different levels of lability), but enhanced a rapid bacterial mineralization within 2\u20137 days of incubation. During this early response, we observed an enrichment of Alphaproteobacteria in both the particle-attached (PA) and free-living (FL) fractions, followed by Gammaproteobacteria during the late-response stage. Specifically, in\u00a0the\n                    <jats:italic>Microcystis<\/jats:italic>\n                    -derived OM supply, the emergence and persistence of Bacilli members were detected. At the class level, differences according to cyanobacterial species were also detected, suggesting specific ecological niches within the PA fraction, likely driven by the quality of the cyanobacterial-derived OM pools. Concomitantly, the supply of cyanobacterial-derived organic matter promoted the accumulation of less bioavailable, chemically complex, and persistent compounds, a pattern that was more pronounced for\n                    <jats:italic>Aphanizomenon-<\/jats:italic>\n                    derived OM than for\n                    <jats:italic>Microcystis<\/jats:italic>\n                    -derived OM. The refractory nature of the remaining OM explained the rapid decline in microbial abundances and activities. The chemical imprint of cyanobacterial-derived OM persisted even after microbial mineralization over the 28-day experiment. Our study highlights that different cyanobacterial OM pools induce specific microbial responses, while also exerting a long-term effect on both OM recycling and microbial community composition.\n                  <\/jats:p>","DOI":"10.3389\/frmbi.2026.1866641","type":"journal-article","created":{"date-parts":[[2026,7,13]],"date-time":"2026-07-13T05:34:53Z","timestamp":1783920893000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Synergistic interactions between biogenic organic matter and microbial dynamics during simulated senescent cyanobacterial blooms in freshwater mesocosms"],"prefix":"10.3389","volume":"5","author":[{"given":"No\u00e9mie","family":"Dechaux","sequence":"first","affiliation":[{"name":"Sorbonne Universit\u00e9, UMR 7618 CNRS - INRAE - IRD - Univ Paris Cit\u00e9 - UPEC, Institut d\u2019\u00c9cologie et des Sciences de l\u2019Environnement de Paris (iEES-Paris)","place":["Paris, France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nina","family":"Gu\u00e9rin","sequence":"additional","affiliation":[{"name":"Sorbonne Universit\u00e9, UMR 7618 CNRS - 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