Introduction Coral reefs of Guadeloupe have undergone substantial ecological degradation over the past decade, driven by cumulative disturbances including mass bleaching events, the emergence of Stony Coral Tissue Loss Disease (SCTLD), repeated Diadema antillarum die-offs and recurrent cyclones. Methods A 10-year dataset (2014-2024), from the European Water Framework Directive, combining physicochemical measurements, benthic c...

Introduction While crucial to ensuring the production of accurate and high-quality data—and to avoid erroneous conclusions—data quality control (QC) in environmental monitoring datasets is still poorly documented. Methods With a focus on annual inter-laboratory comparison (ILC) exercises performed in the context of the French coastal monitoring SOMLIT network, we share here a pragmatic approach to QC, which allows the calculat...

An experimental artificial structure was deployed in March 2014 on the intertidal zone of the Bay of Seine (eastern part of the English Channel), at intervals of one year until April 2018, i.e., from February 2015 onwards, two blocks were collected in April each year. This study provides an inventory of sessile and motile invertebrates living on the artificial hard-bottom and describes the stages of colonization and succession...

Summary Salinity regimes in estuaries and coastal areas vary with river discharge patterns, seawater evaporation, the morphology of the coastal waterways and the dynamics of marine water mixing. Therefore, microalgae have to respond to salinity variations at time scales ranging from daily to annual cycles. Microalgae may also have to adapt to physical alterations that induce the loss of connectivity between habitats and the en...

Summary Protection of nitrogenase from oxygen in unicellular Cyanobacteria is obtained by temporal separation of photosynthesis and diazotrophy through transcriptional and translational regulations of nitrogenase. But diazotrophs can face environmental situations in which N 2 fixation occurs significantly in the light, and we believe that another control operates to make it possible. The night‐time shutdown of PSII activity is...

Summary We analysed the effect of photoperiod length ( PPL ) (16:8 and 8:16 h of light–dark regime, named long and short PPL , respectively) on the temporal orchestration of the two antagonistic, carbon and nitrogen acquisitions in the unicellular, diazotrophic cyanobacterium C rocosphaera watsonii strain WH 8501 growing diazotrophically. Carbon and nitrogen metabolism were monitored at high frequency, and their patterns were...

Summary This study provides with original data sets on the physiology of the unicellular diazotrophic cyanobacterium Crocosphaera watsonii WH8501, maintained in continuous culture in conditions of obligate diazotrophy. Cultures were exposed to a 12:12 light–dark regime, representative of what they experience in nature and where growth is expected to be balanced. Nitrogen and carbon metabolism were monitored at high frequency a...

Silicic‐acid uptake kinetics for a field population of benthic diatoms were examined using a radioisotope tracer over a concentration range of 0‐300 µmol L ‐1 . The microphytobenthos half saturation constant (54 µmol L ‐1 ) and specific uptake rates (0.096 h ‐1 ) for silicic acid were well above those usually found in the pelagic environment. Silicic‐acid kinetics were hyperbolic only at low concentrations (≪60 µmol L ‐1 ). At...