https://doi.pangaea.de/10.1594/PANGAEA.996218Rump, MarcoMarcoRump0009-0004-2329-4889Alfred Wegener Institute - Biological Institute HelgolandLannig, GiselaGiselaLannig0000-0002-9210-256XAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenBock, ChristianChristianBock0000-0003-0052-3090Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenBenthien, AlbertAlbertBenthien0000-0002-9159-3109Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenPogoda, BernadetteBernadettePogoda0000-0003-3997-426XAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenAntoni, DominikDominikAntoniAlfred Wegener Institute - Biological Institute HelgolandGerdts, GunnarGunnarGerdts0000-0003-0872-3927Alfred Wegener Institute - Biological Institute HelgolandPANGAEA2026ecotoxicologyocean alkalinity enhancementOstrea edulisEvent labelType of studySampling date/time, experimentExperiment dayIndividual codeTreatmentRunReplicatesTissue, wet massGlycogenMesocosm experiment2024-04-17T00:00:00/2025-03-12T00:00:00Datasethttps://doi.pangaea.de/10.1594/PANGAEA.996264https://doi.pangaea.de/10.1594/PANGAEA.996219https://doi.pangaea.de/10.1594/PANGAEA.996220https://doi.pangaea.de/10.1594/PANGAEA.996222https://doi.pangaea.de/10.1594/PANGAEA.996216https://doi.pangaea.de/10.1594/PANGAEA.996221https://doi.pangaea.de/10.1594/PANGAEA.996217https://doi.pangaea.de/10.1594/PANGAEA.996214https://doi.pangaea.de/10.1594/PANGAEA.996215468 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalData access is restricted (moratorium, sensitive data, license constraints)This dataset contains glycogen concentrations measured in the labial palps of individual European flat oysters (Ostrea edulis), sampled either before the start of the chronic alkalinity-enhancement exposure (7 May 2024, baseline, n = 8) or after 63 days of exposure to one of five treatments (9 July 2024; unamended control, dissolved alkalinity addition with NaOH and CaCl2 at +250 or +500 µmol/kg, and olivine-based coastal enhanced silicate weathering at +250 or +500 µmol/kg; n = 15 across treatments). Glycogen was extracted from the labial palps tissue and quantified photometrically following the method of Keppler and Decker (1988). For four individuals, glycogen was quantified in two independent measurement runs on separate tissue homogenates of the same individual; all other individuals were measured in a single run. Within each measurement run, glycogen was determined from up to two technical replicate measurements of the same tissue homogenate.7.88894454.180327Helgoland, GermanyBundesamt für Naturschutzhttps://doi.org/10.13039/5011000104153522830300DEFINE2