Investigation of the spatial variability of poly- and perfluoroalkyl substance trophic magnification in selected riverine ecosystems
The occurrence at different trophic levels of 17 poly- and perfluoroalkyl substances (PFASs), including perfluoroalkyl acids (PFAAs) and some of their precursors (e.g., perfluoroalkane sulfonamides, 6:2 fluorotelomer sulfonate), were investigated in riverine freshwater food webs in Southeastern France. Two fish species (Barbus barbus and Squalius cephalus) and various invertebrate taxa were collected at five locations to assess the spatial variability of trophic magnification factors (TMFs). Particular attention was devoted to sample and data processing to minimize potential biases associated with the TMF determination. Fish were significantly more contaminated than invertebrates (ΣPFAS = 7-1811 vs. 0.9-213 ng g-1 wet weight (ww)). Those from the Rhône River presented significantly higher levels due to high concentrations of perfluoroundecanoic acid (406 ng g-1 ww) and perfluorotridecanoic acid (566 ng g 1 ww) ascribed to an industrial point source. Perfluorooctane sulfonate (PFOS) was dominant at the other sites (range concentration = 3.6-134 ng g-1 ww). Two linear regression models were compared (i.e., Kendall regression vs. Generalized Linear Mixed-Effect Model, GLMM). Results showed that TMFs calculated using the non-weighted Kendall regression were higher than those obtained using the GLMM approach. GLMM-based TMFs were consistently > 1 for C9-C14 perfluorocarboxylic acids (PFCAs), PFOS and perfluorodecane sulfonate (PFDS), indicating their apparent biomagnification in the investigated food webs. Comparatively, 6:2 FTSA and N-ethylperfluorooctane sulfonamidoacetic acid (N EtFOSAA) were less often detected and were not significantly biomagnified, probably because of metabolization. TMF estimates were generally consistent across sites although some PFASs (in particular C9, C10 and C13 PFCAs) displayed higher variability, due to a unique extreme value that may have resulted from the contribution of unattributed precursor biotransformation.
(Science of the Total Environment, n° 0048-9697, pp. 393-401, 24/04/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, IRSTEA, EAWAG
A new species of Pista Malmgren, 1866 (Polychaeta, Terebellidae) from the north-western Mediterranean Sea
A new species of Terebellidae, Pista colini sp. n., has been identified from the harbour of Banyuls-sur-Mer, northwestern Mediterranean Sea. This new species was found in very high densities, exclusively in grav-elly sand deposited manually, and was not found in the original source habitat of the gravel. This species is characterized by the colour of the ventral shields with pinkish anterior part and a blood red posterior part in live specimens, a pair of unequal-sized plumose branchiae inserted on segment II and anterior thoracic neuropodia with long-handled uncini. The presence of long-handled uncini even in the smallest specimens constitutes the major difference between Pista colini sp. n. and other Pista species with a single pair of branchiae such as P. lornensis and P. bansei.
(Zookeys. vol. 838, n° 1313-2989, pp. 71-84, 24/04/2026)
OOB, SU, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, IFREMER, SAM
Attribution of ocean temperature change to anthropogenic and natural forcings using the temporal, vertical and geographical structure
We examine whether significant changes in ocean temperatures can be detected in recent decades and if so whether they can be attributed to anthropogenic or natural factors. We compare ocean temperature changes for 1960-2005 in four observational datasets and in historical simulations by atmosphere-ocean general circulation models (AOGCMs) from the Coupled Model Intercomparison Project phase 5 (CMIP5). Observations and CMIP5 models show that the upper 2000 m has warmed with a signal that has a well-defined geographical pattern that gradually propagates to deeper layers over time. Greenhouse gas forcing has contributed most to increasing the temperature of the ocean, a warming which has been offset by other anthropogenic forcing (mainly aerosols), and volcanic eruptions which cause episodic cooling. By characterizing the ocean temperature change response to these forcings we construct multi-model mean fingerprints of time-depth changes in temperature and carry out two detection and attribution analysis. We consider first a two-signal separation into anthropogenic and natural forcings. Then, for the first time, we consider a three signal separation into greenhouse gas, anthropogenic aerosols and natural forcings. We show that all three signals are simultaneously detectable. Using multiple depth levels decreases the uncertainty of the results. Limiting the observations and model fields to locations where there are observations increases the detectability of the signal.
(Climate Dynamics. vol. 53, n° 0930-7575, pp. 5389 - 5413, 24/04/2026)
UOR, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Dispersive and dispersive-like bores in channels with sloping banks
In this paper, a detailed analysis of undular bore dynamics in channels of variable cross-section is presented. Two undular bore regimes, Low Froude Number (LFN) and High Froude Number (HFN), are simulated with a Serre-Green-Naghdi model, and the results are compared with the experiments by Treske. We show that contrary to Favre waves and HFN bores, which are controlled by dispersive non-hydrostatic mechanisms, LFN bores correspond to a hydrostatic phenomenon. The dispersive-like properties of the LFN bores is related to wave refraction on the banks in a way similar to that of edge waves in the nearshore. A fully hydrostatic asymptotic model for these dispersive-like bores is derived and compared to the observations, confirming our claim
(Journal of Fluid Mechanics. vol. 870, n° 0022-1120, pp. 595-616, 24/04/2026)
UGA [2016-2019], IRSTEA, UR ETGR (ETNA), IRSTEA, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, CARDAMOM, IMB, UB, Bordeaux INP, CNRS, Inria
Mesures des concentrations et des flux de polluants atmosphériques
(pp. 127-156, 24/04/2026)
ECOSYS, INRAE, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, LISA (UMR_7583), INSU - CNRS, UPEC UP12, CNRS, UPCité, LATMOS, UVSQ, INSU - CNRS, SU, CNRS, PhLAM, CNRS, IRCELYON, UCBL, INC-CNRS, CNRS, SAS, INRA, IGE, IRD, Grenoble INP, INSU - CNRS, CNRS, UGA [2016-2019], Fédération OSUG, ICARE, UO, CNRS, INSIS - CNRS, ICPEES, UNISTRA, INC-CNRS, CNRS, MNGE, UNISTRA, Université de Haute-Alsace (UHA), INSERM, INC-CNRS, CNRS, PC2A, CNRS, LCE, AMU, INC-CNRS, CNRS, IMT Lille Douai, IMT, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
First record of Monocorophium uenoi (Stephenson, 1932) (Crustacea: Amphipoda: Corophiidae) in the Bay of Biscay, French Atlantic coast
(BioInvasions Records. vol. 8, n° 2242-1300, pp. 87-95, 24/04/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, PatriNat, MNHN, CNRS, AFB
Nouvelles connaissances sur le fonctionnement biogéochimique des grands lacs landais
Les grands lacs landais, le lac de Cazaux-Sanguinet (C-S) et le lac de Parentis-Biscarrosse (P-B), ont une morphologie identique et drainent des bassins versants de taille et de nature très comparables. Pourtant, le lac de C-S est oligotrophe alors que le lac de P-B est eutrophe, avec des développements massifs de cyanobactéries et de plantes exotiques envahissantes. Cette situation est due à un historique des apports en nutriments dans le lac de P-B. En effet, durant des décennies, d’importants flux de phosphate d’origine industrielle ont contaminé ce lac. Bien que les flux aient été considérablement ralentis au cours des années 90, le milieu reste eutrophe. Nous avons donc étudié différents compartiments impliqués dans les flux de nutriments des deux lacs, à savoir le bassin versant, les canaux, la colonne d’eau et les sédiments, au cours d’un suivi réalisé en 2016-2017. Nos résultats montrent que les apports par les principaux cours d’eau qui drainent les bassins versants sont aujourd’hui comparables pour les deux lacs. Le bassin versant de C-S est modérément impacté par les activités agricoles situées en tête de bassin. La rivière Nasseys qui arrive au lac de P-B apporte encore un excès de phosphate par rapport aux autres cours d’eau. Cet excès provient des rejets de l’usine responsables des flux importants du passé. Toutefois, les flux sont faibles. Les canaux à la sortie des lacs sont très peu concentrés en nutriments, ce qui suggère que ces derniers sont efficacement retenus dans les lacs. Ce qui distingue nettement les deux lacs est d’une part l’intensité des processus de minéralisation de la matière organique dans les sédiments et d’autre part la teneur en phosphore associé aux oxydes fer dans les sédiments. Les flux benthiques de phosphore et d’ammonium sont importants dans le lac de P-B, en particulier en été quand les eaux sont stratifiées et anoxiques au fond. Nos travaux montrent que le phosphore hérité du passé reste le principal responsable de l’eutrophisation d’aujourd’hui.
(Dynamiques Environnementales - Journal international des géosciences et de l’environnement, n° 1968-469X, pp. 153-179, 24/04/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Impact de contaminants sur les acides gras des diatomées
Cette présentation décrit une partie des résultats acquis pendant la thèse, concernant l'impact du diuron et du S-métolachlore sur la diatomée d'eau douce Gomphonema gracile. En particulier cette présentation s'intéresse à décrire la complémentarité entre les profils d'acides gras et différents types de critères d'impact plus classiquement utilisés
(24/04/2026)
UR EABX, IRSTEA, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Thermal Reduction of Graphene Oxide Mitigates Its In Vivo Genotoxicity Toward Xenopus laevis Tadpoles
The worldwide increase of graphene family materials raises the question of the potential consequences resulting from their release in the environment and future consequences on ecosystem health, especially in the aquatic environment in which they are likely to accumulate. Thus, there is a need to evaluate the biological and ecological risk but also to find innovative solutions leading to the production of safer materials. This work focuses on the evaluation of functional group-safety relationships regarding to graphene oxide (GO) in vivo genotoxic potential toward X. laevis tadpoles. For this purpose, thermal treatments in H2 atmosphere were applied to produce reduced graphene oxide (rGOs) with different surface group compositions. Analysis performed indicated that GO induced disturbances in erythrocyte cell cycle leading to accumulation of cells in G0/G1 phase. Significant genotoxicity due to oxidative stress was observed in larvae exposed to low GO concentration (0.1 mg.L−1). Reduction of GO at 200 °C and 1000 °C produced a material that was no longer genotoxic at low concentrations. X-ray photoelectron spectroscopy (XPS) analysis indicated that epoxide groups may constitute a good candidate to explain the genotoxic potential of the most oxidized form of the material. Thermal reduction of GO may constitute an appropriate “safer-by-design” strategy for the development of a safer material for environment.
(Nanomaterials. vol. 9, n° 2079-4991, pp. 584, 24/04/2026)
LEFE, INEE-CNRS, CNRS, UT3, Comue de Toulouse, CNRS, Toulouse INP, Comue de Toulouse, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, CIRIMAT, UT3, Comue de Toulouse, IUT Toulouse Auch Castres, UT3, Comue de Toulouse, INC-CNRS, CNRS, Toulouse INP, Comue de Toulouse, IS2M, Université de Haute-Alsace (UHA), INC-CNRS, CNRS, MNGE, UNISTRA, Université de Haute-Alsace (UHA), INSERM, INC-CNRS, CNRS, UNISTRA, Université de Haute-Alsace (UHA), CNRS
Dispersion et exposition humaine aux métaux en Nouvelle-Calédonie : synthèse des résultats
Cette synthèse constitue le volume 4 (sur 4) du programme intégré « Dispersion et exposition humaine aux métaux en Nouvelle-Calédonie » composé de 3 programmes complémentaires étudiant les métaux et leur toxicité : DMML « Dispersion des métaux de la mine au lagon », Dynamine « Dynamique des métaux de la mine au lagon », Métexpo « Niveaux d’imprégnation et déterminants de l’exposition humaine aux métaux ».- Elle regroupe les synthèses de chacun des trois programmes et propose une conclusion commune ouvrant sur les perspectives en termes de recherche.
(pp. 53 p., 24/04/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, CNRS, ISEA, UNC, ARTeHiS, MCC, UB, CNRS, UNB, GSMA, URCA, CNRS, CEREGE, IRD, AMU, CdF (institution), INSU - CNRS, CNRS, INRAE, AMU, SU, ENTROPIE [Nouvelle-Calédonie], IRD [Nouvelle-Calédonie], IFREMER, UNC, CNRS, MIO, IRD, AMU, INSU - CNRS, UTLN, CNRS, IMPMC, MNHN, SU, CNRS, IRD, IPGP - UMR_7154, INSU - CNRS, IGN, UR, IPG Paris, CNRS, UPCité, INSERM, CRCHUQ, ULaval