Short-term effects of CO2, nutrients and temperature on three marine macroalgae under solar radiation

• Published in: Aquatic Biology
• Main Authors: Stengel, D, B, Conde-Álvarez, R, Connan, Solène, Nitschke, U, Arenas, F, Abreu, H, Bonomi Barufi, J, Chow, F, Robledo, D, Malta, E, J, Mata, M, Konotchick, T, Nassar, C, Pérez-Ruzafa, Á, López, D, Marquardt, R, Vaz-Pinto, F, Celis-Plá, Paula S. M., Hermoso, M, Ruiz, E, Ordoñez, G, Flores, P, Zanolla, M, Bañares-España, E, Altamirano, M, Korbee, N, Bischof, K, Figueroa, F, L
• Other Authors: National University of Ireland Galway (NUI Galway), Universidad de Málaga Málaga = University of Málaga Málaga, Laboratoire de génie des procédés - environnement - agroalimentaire (GEPEA), Mines Nantes (Mines Nantes)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-École nationale vétérinaire, agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences et techniques de la mer (INTECHMER), Conservatoire National des Arts et Métiers CNAM (CNAM), Martin Ryan Institute, Interdisciplinary Centre of Marine and Environmental Research Matosinhos, Portugal (CIIMAR), Universidade do Porto = University of Porto, Auteur indépendant, Universidade Federal de Santa Catarina = Federal University of Santa Catarina Florianópolis (UFSC), Universidade de São Paulo = University of São Paulo (USP), Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV), Instituto Andaluz de Investigación y Formación Agraria y Pesquera (IFAPA), J. Craig Venter Institute, Universidade Federal do Estado do Rio de Janeiro (UNIRIO), Universidad de Murcia, Fraunhofer Institute for Molecular Biology and Applied Ecology (Fraunhofer IME), Fraunhofer (Fraunhofer-Gesellschaft), Universität Bremen
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2014
• Subjects: Chlorophyll fluorescence; Climate change; Light climate; Macroalgae; Outdoor multi-tank system; Nutrients; Ocean acidification; Temperature; [SDV.EE.BIO]Life Sciences [q-bio]/Ecology; environment/Bioclimatology; [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
• Online Access: https://hal.science/hal-04652639; https://hal.science/hal-04652639/document; https://hal.science/hal-04652639/file/b022p159.pdf; https://doi.org/10.3354/ab00576

International audience Three macroalgal species belonging to Chlorophyta (Ulva rigida), Rhodophyta (Ellisolandia elongata) and Phaeophyceae (Heterokontophyta; Cystoseira tamariscifolia), naturally growing at the same shore level and representing 3 morpho-functional groups, were exposed to short-term changes in temperature under different carbon and nitrogen regimes. Experiments were conducted in outdoor tanks at 4 combinations of carbon and nitrogen levels under reduced solar radiation. In vivo chl a fluorescence parameters and pigment contents were monitored to assess diurnal physiological responses and potential for recovery. Strong fluctuations in chl a fluorescence parameters, but not in chl a content, were observed in response to diurnal variation in solar radiation and light climate within the tanks; sensitivity varied between algal species and, in some cases, depended on the carbon and nitrogen regime. Nitrogen uptake was similarly high in U. rigida and E. elongata and lowest in C. tamariscifolia. In U. rigida and E. elongata, chl a concentrations decreased after high-carbon treatments. Effective photosystem II quantum efficiency was reduced in all species at noon, and lowest in C. tamariscifolia. The results highlight the complexity of physiological short-term acclimations which were most likely linked to biochemical changes at the cellular level. Long-term experiments are required in future for more comprehensive investigation of the observed interactive effects of the different environmental parameters.