{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,6]],"date-time":"2026-02-06T10:03:38Z","timestamp":1770372218795,"version":"3.49.0"},"posted":{"date-parts":[[2026]]},"group-title":"SSRN","reference-count":88,"publisher":"Elsevier BV","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>Seagrass seedlings are key to meadow recovery under global change, as they enable recolonization of degraded areas and provide genetic variability needed for adaptation. While invasive macroalgae increasingly threaten seagrass communities, elevated CO2 has been proposed to enhance seagrass performance and potentially buffer other stressors. Here, we conducted a mesocosm experiment to test the combined effects of two invasive macroalgae (Lophocladia trichoclados and Caulerpa cylindracea) and elevated CO2 on Posidonia oceanica seedlings. CO2 enrichment increased carbohydrate reserves in rhizomes and induced subtle shifts in root-associated microbiomes. In contrast, invasive macroalgae had consistently negative effects on seedling development and physiology and strongly altered both above- and belowground microbial communities. Despite its potential to stimulate seagrass productivity, elevated CO2 did not mitigate the detrimental impacts of invasive macroalgae. These findings indicate that future CO2 conditions may not offset invasion-driven stress at the recruitment stage, highlighting the need for targeted management efforts to limit macroalgal proliferation and support seagrass meadow regeneration.<\/jats:p>","DOI":"10.2139\/ssrn.6183316","type":"posted-content","created":{"date-parts":[[2026,2,5]],"date-time":"2026-02-05T18:46:15Z","timestamp":1770317175000},"source":"Crossref","is-referenced-by-count":0,"title":["Invasive macroalgae exert stronger effects than elevated CO2 on seagrass (Posidonia oceanica) seedling performance and associated microbiomes"],"prefix":"10.2139","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2238-6018","authenticated-orcid":true,"given":"Iris  Eline","family":"Hendriks","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5998-1366","authenticated-orcid":true,"given":"Julia","family":"M\u00e1\u00f1ez-Crespo","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9127-9929","authenticated-orcid":true,"given":"Clea  N.","family":"van de Ven","sequence":"additional","affiliation":[]},{"given":"R.  Sean","family":"Fitzpatrick","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5434-2247","authenticated-orcid":true,"given":"Alberto  V.","family":"Borges","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4678-175X","authenticated-orcid":true,"given":"Willy","family":"Champenois","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1964-6819","authenticated-orcid":true,"given":"T\u00e2nia","family":"Aires","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9579-9606","authenticated-orcid":true,"given":"Aschwin  H.","family":"Engelen","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2422-0732","authenticated-orcid":true,"given":"Gerard","family":"Muyzer","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8803-1148","authenticated-orcid":true,"given":"J. Arie","family":"Vonk","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8682-2504","authenticated-orcid":true,"given":"Fiona","family":"Tom\u00e1s","sequence":"additional","affiliation":[]}],"member":"78","reference":[{"key":"ref1","doi-asserted-by":"crossref","DOI":"10.3389\/fmicb.2016.00559","article-title":"Host and Environmental Specificity in Bacterial Communities Associated to Two Highly Invasive Marine Species (Genus Asparagopsis)","volume":"7","author":"T Aires","year":"2016","journal-title":"Frontiers in Microbiology"},{"issue":"7","key":"ref2","doi-asserted-by":"crossref","DOI":"10.1371\/journal.pone.0068429","article-title":"Invasion Is a Community Affair: Clandestine Followers in the Bacterial Community Associated to Green Algae, Caulerpa racemosa, Track the Invasion Source","volume":"8","author":"T Aires","year":"2013","journal-title":"PLOS 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