Hourly sound pressure magnitude data measured underwater on oyster tables during a one-year semi-controlled experiment
This dataset shows the hourly sound pressure magnitude data measured underwater on each oyster table (control and ALAN conditions, at the oyster's level) throughout the year of experiment for different frequencies (10 Hz, 20 Hz, 30 Hz, 40 Hz, 50 Hz, 60 Hz, 70 Hz, 80 Hz, 90 Hz, 100 Hz, 200 Hz, 300Hz, 400 Hz, 500 Hz, 600 Hz, and 700 Hz). The mean sound pressure magnitude is also presented for each condition. In the ALAN condition, data are missing from August 13, 2024, until the end of the experiment due to the failure of the hydrophone used.
(21/02/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Hourly physicochemical parameters measured underwater on oyster tables during a one-year semi-controlled experiment
This dataset shows the hourly physicochemical parameters measured underwater throughout the year of the experiment. The temperature and water depth were measured on each oyster table (control and ALAN conditions, at the oyster's level), while the turbidity was measured only on the ALAN table, and conductivity and salinity were measured only on the control table.
(21/02/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Assessing the invasion risk of the cnidaria Blackfordia virginica Mayer, 1910: a threat to the Baltic Sea ecosystem?
The ecological role, bloom extent and long-term dynamics of jellyfishes are mostly overlooked due to sampling limitations, leading to the lack of continuous long-term datasets. A rise in frequency and magnitude of jellyfish invasion around the world is shedding new light on these organisms. In this study, we estimate the current and future distribution of the introduced jellyfish Blackfordia virginica in the Baltic Sea. We determine the combination of favorable levels of temperature and salinity for this species by analyzing presence/absence data from areas outside the Baltic Sea and project the distribution of suitable habitat in the Baltic Sea across different scenarios with variable climate forcing and eutrophication levels. Our results show that suitability increases with rising temperature and optimal salinity range from 13 to 20 for this species. In addition, a relatively large area of the Baltic Sea represents favorable abiotic conditions for B. virginica , enhancing the concerns on its potential range expansion. Spatial analysis illustrates that the coastal areas of the southern Baltic Sea are particularly at risk for the invasion of the species. The observation of the projection of habitat suitability across time highlights that future Baltic Sea environmental conditions increase suitability levels for B. virginica and suggest a potential expansion of its distribution in the future.
(Biological Invasions. vol. 27, n° 1387-3547, pp. 106, 21/02/2026)
BOREA, MNHN, IRD, SU, CNRS, UA, GEOMAR, CCMAR, UAlg, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
The influence of large-scale climate patterns on sediment loss from agricultural land—exploration using an instrumented field and catchment scale platform
Accelerated soil erosion and sediment delivery are threats to water quality. In Western Europe, weather patterns are strongly influenced by large scale climate systems such as the North Atlantic Oscillation (NAOi). Recently, however, a new climate index has been developed, called the West Europe Pressure Anomaly (WEPAi), which may be more relevant for weather in North Western Europe. Recent attempts have tried to link variability in weather patterns as described by hydro-climatic indices and amplifications in the degradation of water quality. However, to our knowledge, no previous work has been undertaken on investigating their effects on suspended sediment concentrations (SSCs). A study was conducted in southwest England using long-term meteorological, monthly NAOi and WEPAi, and 15 min discharge and turbidity datasets collected from an instrumented field and catchment scale monitoring platform. Monthly winter precipitation totals, and air temperature were both found to be significantly positively related to NAOi, but not in the summer. Both variables were significant and more strongly related with the WEPAi for both seasons. Flow weighted mean SSCs calculated for both seasons over a 4 year period were compared to monthly NAOi and WEPAi. In winter months, no significant relationships were found at any scale for NAOi. However, significant positive relationships with the WEPAi were present regardless of catchment size. In the summer months there were no significant relationships with either climate indices. Large-scale climate drivers are important in the sediment responses of agricultural landscapes. An ability to forecast monthly climate scale drivers could enable farmers to better plan for those periods when hydro-sedimentological responses are likely to be elevated. More work is needed across a range of landscape typologies to confirm that the relationships observed hold true more widely.
(Environmental Research Letters. vol. 20, n° 1748-9326, pp. 044023, 21/02/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Les spéléothèmes enregistreurs des environnements passés et marqueurs de l’histoire des grottes
Les spéléothèmes, dépôts carbonatés des grottes, constituent des archives reconnues des variations climatiques. Grâce à la possibilité de les dater par radiochronologie, ils fournissent de précieux jalons chronologiques sur l’histoire géomorphologique des grottes, des occupations humaines passées et permettent d'évaluer les changements environnementaux avec une grande précision sur des centaines de milliers d’années. Leur étude est une science en pleine évolution, très prometteuse en termes de quantification des paramètres climatiques. Les spéléothèmes sont cependant issus d’un milieu fragile, qui doit être géré avec précaution afin de protéger ces témoins uniques du passé.
(Dynamiques Environnementales - Journal international des géosciences et de l’environnement. vol. 54-55, n° 1968-469X, pp. 1-53, 21/02/2026)
CEREGE, IRD, AMU, CdF (institution), INSU - CNRS, CNRS, INRAE, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Influence of cockle bioturbation on microphytobenthic primary producers: habitat and density-dependent effects
While the global impact of the edible cockle Cerastoderma edule on microphytobenthos (MPB) dynamics has been extensively studied, some underlying processes remain unknown, such as their non-trophic interactions. For this purpose, a laboratory mesocosm experimental approach was used to quantify the bioturbation generated by C. edule adults and their influence on oxygen and nutrient fluxes, MPB biomass and photosynthetic performance at the sediment-water interface. The effects of sediment properties and cockle densities (0, 288, 720 and 1,297 ind. m−2) were also investigated. Our results showed that cockles exert a net negative density-dependent effect on MPB biomass, with intensity varying according to sediment type. This is mainly due to sediment reworking by cockles and their emergence at the sediment surface, mechanically disrupting MPB biofilms. Nonetheless, the physiological status and photosynthetic performances of the remaining MPB cells were not impacted. This could be explained by cockle bioirrigation which stimulates nutrient fluxes at the sediment surface and cell turnover. In the finest sediment, the stimulation of MPB growth by nutrient fluxes did not compensate algal biomass loss due to burial, leading to a net decrease in MPB biomass. In coarser sediment, no significant impact of cockles on the net total MPB biomass was observed. This indicates a balance between suboptimal sediment condition for MPB, biofilm destruction by cockles, and enhanced bioirrigation rates that increase nutrient availability for MPB biofilms at the sediment-water interface.
(Marine Biology. vol. 172, n° 0025-3162, pp. 70, 21/02/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, MERSEA, UNICAEN, NU, CESAM
A new species of Diopatra (Annelida, Onuphidae) from Akanda National Park in Gabon (West Africa)
Several ecological surveys were recently conducted in the Akanda National Park in Gabon. The main objectives of this study were to assess the urban impact on the estuarine ecosystem of Libreville and to document the benthic biodiversity of this ecosystem. Among all the species collected, a new species of Diopatra was discovered in different habitats, including mangroves. This species is described and illustrated in detail, and information on 16S gene is provided. Diopatra ariasi sp. nov. is a medium-sized species and belongs to the D. neapolitana complex, having antennae with long ceratophores and ventral lobes. This species is also characterized by the presence of ceratophores with 9–12 rings on antennae, by sensory buds which are semicircular, by spiraled branchiae from chaetiger 4–5; by bidentate pseudocompound falcigers with moderately long hoods in first four chaetigers; by pectinate chaetae with 11–15 teeth from chaetiger 6–8 and by bidentate subacicular hooks from chaetiger 15–18.
(Marine Biodiversity. vol. 55, n° 1867-1616, pp. 94, 21/02/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, UMR MARBEC, IRD, IFREMER, CNRS, UM
Le mystère de la maladie des pêcheurs (2020-2021) sénégalais levé [Note politique AWA]
Il aura fallu quatre années d'investigations, la mobilisation d'une quarantaine de scientifiques à travers une vingtaine d'équipes de recherche situées dans une quinzaine de laboratoires à travers le monde, pour venir àbout de l'énigme de la maladie mystérieuse qui a sévit au Sénégal en 2020 et 2021 chez les pêcheurs artisans. Cette maladie mystérieuse a touché plus d'un millier de pêcheurs sénégalais, suscitant l'inquiétude et l'attentioninternationale, est une dermatite aiguë. Les mêmes symptômes sont apparus sur des pêcheurs artisans en Guinée en 2023. Une étude menée par un consortium scientifique international (article publié en février 2025)dévoile l'origine de cette maladie : une toxine, la Portimine A, produite par la microalgue marine Vulcanodinium rugosum, jusqu'ici inconnu au Sénégal et dans sa sous-région CSRP. Cette toxine, qui perturbe les cellules de la peau humaine, déclenche une inflammation sévère. Cette étude met en lumière une problématique plus large : l'impact croissant des toxines environnementales sur la santé humaine, dans un contexte du changementglobal, notamment le changement climatique et l'accroissement des flux de transport maritime qui favorisent la prolifération et la redistribution de certains micro-organismes marins, comme les dinoflagellés toxiques.Le trafic maritime favorise la dissémination d'espèces marines d'un écosystème à un autre, notamment par les eaux de ballast. L'épidémie de dermatite associée à la Portimine A illustre les risques imprévisibles queles transformations subies par les écosystèmes marins peuvent entraîner. Elle souligne également l'urgence de surveiller, de manière coordonnée interdisciplinaire à une échelle sous-régionale, les espèces marinesproductrices de toxines, de comprendre leurs mécanismes d'action et d'adaptation, et de développer des solutions pour prévenir et traiter les menaces qui pèsent sur la santé humaine et les écosystèmes marins.
(pp. 16 p. multigr., 21/02/2026)
LEMAR, IRD, IFREMER, UBO EPE, CNRS, IRD, UCAD, LERBO, COAST, IFREMER, PSMS, URCA, PHYTOX, IFREMER, LBCM, UBS, UBO EPE, IUEM, IRD, INSU - CNRS, UBO EPE, CNRS, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, IPBS, CNRS, EPE UT, Comue de Toulouse
En-échelon Rifting and Origin of the Volcanism in the Comoros
Two volcanic provinces have been recently discovered during the SISMAORE oceanographic cruise in the Comoros archipelago in the North Mozambique Channel between Madagascar and East Africa: N'Droundé, along the North-eastern insular slopes of Grande Comores Island and Mwezi, in the abyssal plain, north-east of Mayotte and Anjouan islands. By combining bathymetry and backscatter data, high-resolution seismic reflection and sub-bottom profiles, we have identified and mapped various tectonic (faults, forced folds) and volcanic structures (lava flows, edifices, sills, dykes) at several spatial scales on the seabed and in crosssection within the sedimentary cover. We have characterized the volcano-tectonic structures (geometry, segmentation, and kinematics) to better understand the link (geometry, chronology) between tectonic and volcanic processes. We show that volcanic and tectonic features are controlled by tectonic processes and viceversa. Ridges, volcanic cones and lava flows are set up along fissures and dikes during main rifting events to accommodate a N40°E regional extension within an E-W right lateral shear transfer zone. The volcano tectonic features are Plio-Pleistocene. This transfer zone lies between the offshore branch of the East African rift system and Malagasy grabens and may have formed when the East African rifts propagated offshore. We evidence a major rifting episode in the last Ma. The estimated volume and flux of extruded lavas show that the volcanism of the Comoros could be related to shallow tectonic processes.
(Geochemistry, Geophysics, Geosystems. vol. 26, pp. e2024GC011576, 21/02/2026)
IPGP - UMR_7154, INSU - CNRS, IGN, UR, IPG Paris, CNRS, UPCité, BRGM, LMV, IRD, INSU - CNRS, CNRS, UCA, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, iSTeP, INSU - CNRS, SU, CNRS, CY
Non-Stationary Model Free Parameter In Equilibrium Shoreline Modelling
The state-of-the-art equilibrium shoreline model proposed by Davidson et al. (2013) is used to hindcast shoreline evolution. A similar approach to the work of Ibaceta et al. ( 2022) is adopted, where they introduced non-stationary model free parameters to improve long term shoreline change predictions. An Ensemble Kalman Filter (EnKF) is implemented to track the temporal variability in model free parameters and explore if their evolution can be linked to the environmental forcing. A correlation between the winter wave energy and the model free parameter φ (beach memory) is identified where high energetic winters are followed by an increase in the parameter suggesting such time variation in beach memory can be parametrized.
(21/02/2026)
UB, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, BRGM, WRL, UNSW