Light-mediated temperature susceptibility of kelp species (Agarum clathratum, Saccharina latissima) in an Arctic summer heatwave scenario ...

• Main Authors: Niedzwiedz, Sarina, Vonnahme, Tobias, Juul-Pedersen, Thomas, Bischof, Kai, Diehl, Nora
• Format: Dataset
• Language: English
• Published: PANGAEA 2024
• Subjects: Acclimatisation; Agarum clathratum; Darkening; marine heatwaves MHWs; Saccharina latissima; Type of study; Species; Species, unique identification Semantic URI; Species, unique identification URI; Analysis date/time, experiment; Day of experiment; Phase; Treatment temperature; Treatment light intensity; Replicate; Temperature, water; Maximum potential photosynthesis; Photosynthetic quantum efficiency; Light saturation; Maximum photochemical quantum yield of photosystem II, relative; Biomass, wet mass; Biomass, dry mass; Phlorotannins, per dry mass; Chlorophyll c, per dry mass; Fucoxanthin, per dry mass; Violaxanthin, per dry mass; Antheraxanthin, per dry mass; Zeaxanthin, per dry mass; Chlorophyll a, per dry mass; beta-Carotene, per dry mass; Xanthophyll-cycle pigments, per dry mass; Pigments, xanthophyll-cycle/chlorophyll a ratio; De-expoxidation state of xanthophyll cycle; Pigments, accessory, per dry mass; Pigments/chlorophyll a ratio; Respiration rate, oxygen; Laboratory experiment; Portable Chlorophyll Flourometer, Heinz Walz GmbH, Effeltrich, Germany, PAM-2100; High Performance Liquid Chromatography HPLC; Optical Oxygen Meter - FireSting-O2, PyroScience GmbH, ASE 350; Arctic Biodiversity & Livelihoods FACE-IT; Arctic; Greenland; Arctic biodiversity; Climate change
• Online Access: https://dx.doi.org/10.1594/pangaea.964643; https://doi.pangaea.de/10.1594/PANGAEA.964643

Kelps (Phaeophyceae, Laminariales) function as ecosystem engineers along many Arctic rocky shores. With ongoing climate change, the frequency and intensity of marine heatwaves are increasing. Further, extensive meltwater plumes darken Arctic fjords. It was the aim of this study to analyse the future development of Arctic kelp forest ecosystems. We conducted a laboratory experiment, in which we determined physiological and biochemical responses of Agarum clathratum and Saccharina latissima to a marine heatwave scenario (4, 7, and 10°C) being acclimated to either low-light (3 µmol photons m²/s) or in-situ-light (120 µmol photons m²/s) conditions. Grown sporophytes were sampled in Nuup Kangerlua, Greenland from a sampling depth between 7-10 m. Meristematic discs were cut (diameter 2 cm) and distributed equally between treatments and replicates. The discs acclimated to the light conditions for two days, before the 12 days heatwave scenario started, followed by a five-day recovery period. Maximum quantum yield of ...