FN Archimer Export Format PT J TI Water temperature drives phytoplankton blooms in coastal waters BT AF Trombetta, Thomas Vidussi, Francesca Mas, Sébastien Parin, David Simier, Monique Mostajir, Behzad AS 1:1,3;2:1;3:2;4:2;5:3;6:1; FF 1:;2:;3:;4:;5:;6:; C1 MARBEC (Marine Biodiversity, Exploitation and Conservation), Centre National de la Recherche Scientifique, Université de Montpellier, Institut Français de Recherche pour l’Exploitation de la Mer, Institut de Recherche pour le Développement, Montpellier, France MEDIMEER (Mediterranean Platform for Marine Ecosystems Experimental Research), Observatoire de Recherche Méditerranéen de l’Environnement, Centre National de la Recherche Scientifique, Université de Montpellier, Institut de Recherche pour le Développement, Institut National de Recherche en Sciences et Technologies pour l’Environnement et l’Agriculture, Sète, France Univ Montpellier, CNRS, MARBEC Marine Biodivers Exploitat & Conservat, Inst Rech Dev,Inst Francais Rech Exploitat Mer, Sete, France C2 CNRS, FRANCE CNRS, FRANCE IRD, FRANCE UM MARBEC IN WOS Cotutelle UMR DOAJ copubli-france IF 2.74 TC 95 UR https://archimer.ifremer.fr/doc/00488/60004/63240.pdf https://archimer.ifremer.fr/doc/00488/60004/63241.xlsx LA English DT Article AB Phytoplankton blooms are an important, widespread phenomenon in open oceans, coastal waters and freshwaters, supporting food webs and essential ecosystem services. Blooms are even more important in exploited coastal waters for maintaining high resource production. However, the environmental factors driving blooms in shallow productive coastal waters are still unclear, making it difficult to assess how environmental fluctuations influence bloom phenology and productivity. To gain insights into bloom phenology, Chl a fluorescence and meteorological and hydrological parameters were monitored at high-frequency (15 min) and nutrient concentrations and phytoplankton abundance and diversity, were monitored weekly in a typical Mediterranean shallow coastal system (Thau Lagoon). This study was carried out from winter to late spring in two successive years with different climatic conditions: 2014/2015 was typical, but the winter of 2015/2016 was the warmest on record. Rising water temperature was the main driver of phytoplankton blooms. However, blooms were sometimes correlated with winds and sometimes correlated with salinity, suggesting nutrients were supplied by water transport via winds, saltier seawater intake, rain and water flow events. This finding indicates the joint role of these factors in determining the success of phytoplankton blooms. Furthermore, interannual variability showed that winter water temperature was higher in 2016 than in 2015, resulting in lower phytoplankton biomass accumulation in the following spring. Moreover, the phytoplankton abundances and diversity also changed: cyanobacteria (< 1 μm), picoeukaryotes (< 1 μm) and nanoeukaryotes (3–6 μm) increased to the detriment of larger phytoplankton such as diatoms. Water temperature is a key factor affecting phytoplankton bloom dynamics in shallow productive coastal waters and could become crucial with future global warming by modifying bloom phenology and changing phytoplankton community structure, in turn affecting the entire food web and ecosystem services. PY 2019 PD APR SO Plos One SN 1932-6203 PU Public Library of Science (PLoS) VL 14 IS 4 UT 000463487500020 DI 10.1371/journal.pone.0214933 ID 60004 ER EF