%0 Journal Article %J Marine Ecology Progress Series %D 2020 %T Highly variable taxa-specific coral bleaching responses to thermal stresses %A McClanahan, T.R. %A Darling, E.S. %A Maina, J.M. %A Muthiga, NA %A D'agata, S. %A Leblond, J. %A Arthur, R. %A Jupiter, S.D. %A Wilson, S.K. %A Mangubhai, S. %A Ussi, A.M. %A Mireille M.M. Guillaume %A Humphries, A.T. %A Patankar, V. %A Shedrawi, G. %A Pagu, J. %A Grimsditch, G. %K acclimation %K Adaptation %K Climate Change %K community structure %K Geography %K Stress responses %X Complex histories of chronic and acute sea surface temperature (SST) stresses are expected to trigger taxon- and location-specific responses that will ultimately lead to novel coral communities. The 2016 El Niño-Southern Oscillation provided an opportunity to examine largescale and recent environmental histories on emerging patterns in 226 coral communities distributed across 12 countries from East Africa to Fiji. Six main coral communities were identified that largely varied across a gradient of Acropora to massive Porites dominance. Bleaching intensity was taxon-specific and was associated with complex interactions among the 20 environmental variables that we examined. Coral community structure was better aligned with the historical temperature patterns between 1985 and 2015 than the 2016 extreme temperature event. Additionally, bleaching responses observed during 2016 differed from historical reports during past warm years. Consequently, coral communities present in 2016 are likely to have been reorganized by both long-term community change and acclimation mechanisms. For example, less disturbed sites with cooler baseline temperatures, higher mean historical SST background variability, and infrequent extreme warm temperature stresses were associated with Acropora-dominated communities, while more disturbed sites with lower historical SST background variability and frequent acute warm stress were dominated by stress-resistant massive Porites corals. Overall, the combination of taxon-specific responses, community-level reorganization over time, geographic variation, and multiple environmental stressors suggest complex responses and a diversity of future coral communities that can help contextualize management priorities and activities. %B Marine Ecology Progress Series %V 648 %P 135 - 151 %8 27-08-2020 %G eng %U https://www.int-res.com/abstracts/meps/v648/p135-151/ %! Mar. Ecol. Prog. Ser. %R 10.3354/meps13402 %0 Journal Article %J Harmful Algae %D 2017 %T Nutrient ratios influence variability in Pseudo-nitzschia species diversity and particulate domoic acid production in the Bay of Seine (France) %A Thorel, Maxine %A Pascal Claquin %A Mathilde Schapira %A Romain Le Gendre %A Riou, Philippe %A Didier Goux %A Bertrand Le Roy %A Raimbault, V %A Deton-Cabanillas, A.-F. %A Bazin, Pauline %A Kientz-Bouchart, Valérie %A Juliette Fauchot %K analogs and derivatives %K analysis %K Bay %K Bays %K Biodiversity %K chemistry %K Diatom %K Diatoms %K Domoic acid %K France %K Geography %K kainic acid %K Nitrates %K nitric acid derivative %K particulate matter %K phosphate %K Phosphates %K Physiology %K Phytoplankton %K Principal Component Analysis %K season %K Seasons %K species difference %K Species Specificity %K time factor %K Time Factors %X The population dynamics of different Pseudo-nitzschia species, along with particulate domoic acid (pDA) concentrations, were studied from May 2012 to December 2013 in the Bay of Seine (English Channel, Normandy). While Pseudo-nitzschia spp. blooms occurred during the two years of study, Pseudo-nitzschia species diversity and particulate domoic acid concentrations varied greatly. In 2012, three different species were identified during the spring bloom (P. australis, P. pungens and P. fraudulenta) with high pDA concentrations (∼1400 ng l−1) resulting in shellfish harvesting closures. In contrast, the 2013 spring was characterised by a P. delicatissima bloom without any toxic event. Above all, the results show that high pDA concentrations coincided with the presence of P. australis and with potential silicate limitation (Si:N < 1), while nitrate concentrations were still replete. The contrasting environmental conditions between 2012 and 2013 highlight different environmental controls that might favour the development of either P. delicatissima or P. australis. This study points to the key role of Pseudo-nitzschia diversity and cellular toxicity in the control of particulate domoic acid variations and highlights the fact that diversity and toxicity are influenced by nutrients, especially nutrient ratios. © 2017 Elsevier B.V. %B Harmful Algae %I Elsevier B.V. %V 68 %P 192-205 %G eng %U https://www.scopus.com/inward/record.uri?eid=2-s2.0-85028543709&doi=10.1016%2fj.hal.2017.07.005&partnerID=40&md5=def23b37b0d16a1ae7ab65a7ef2b940b %R 10.1016/j.hal.2017.07.005