https://doi.pangaea.de/10.1594/PANGAEA.996548Steiner, NikoNikoSteiner0000-0003-2559-5891Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenNilsen, Anne MAnne MNilsenNord UniversityGauci, ClémentClémentGauciNord UniversityJueterbock, AlexanderAlexanderJueterbock0000-0002-0659-3172Nord UniversityBartsch, InkaInkaBartsch0000-0001-7609-2149Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenPANGAEA2026heat stressheatwaveKelpLaboratory experimentthermal primingthermal toleranceEvent labelType of studyDateDay of experimentTreatment: temperatureReplicateSporophytes, liveSporophytes, deadSurvivalLaboratory experimentCalculated from counting: Reverse microscope (CKX41SF, Olympus Corporation)2024-01-26T00:00:00/2024-02-09T00:00:00Datasethttps://doi.pangaea.de/10.1594/PANGAEA.99654710.3354/meps152531214 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalWe assessed the heat tolerance of microscopic Saccharina latissima sporophytes under heat stress and in response to gametophyte priming. We primed S. latissima gametophytes (Lofoten 2023; 15°C clonal culture; n = 7) for 3 weeks at 0°C, 10°C, and 20°C and induced gametogenesis at 10°C for 2 weeks. Resulting microscopic sporophytes were subjected to a 14-day heat stress treatment at 20°C, 21.5°C, and 23°C, where we counted the number of alive and dead sporophytes and calculated the survival rates in relation to day 0. The laboratory experiment was carried out at the Alfred Wegener Institute in Bremerhaven, Germany.8.5805253.53327The Research Council of Norwayhttps://doi.org/10.13039/501100005416334327KELPRIME - Priming as a kelp engineering technology to enhance yield and secure production under environmental challenges