Impact of cadmium on aquatic bird Cairina moschata
The impact on palmiped Cairina moschata of two levels of dietary cadmium (Cd) contamination (C1: 1 mg kg-1 and C10: 10 mg kg-1) was investigated on liver gene expression by real-time PCR. Genes involved in mitochondrial metabolism, in antioxidant defences, detoxification and in DNA damage repair were studied. Metallothionein (MT) protein levels and Cd bioaccumulation were also investigated in liver, kidneys and muscle. Male ducks were subjected to three periods of exposure: 10, 20 and 40 days. Cd was mainly bioaccumulated in kidneys first and in liver. The concentrations in liver and kidneys appeared to reach a stable level at 20 days of contamination even if the concentrations in muscle still increased. Cd triggered the enhancement of mitochon-drial metabolism, the establishment of antioxidant defences (superoxide dismutase Mn and Cu/Zn; catalase) and of DNA repair from 20 days of contamination. Discrepancies were observed in liver between MT protein levels and MT gene up-regulation. MT gene expression appeared to be a late hour biomarker.
(BioMetals. vol. 22, n° 0966-0844, pp. 843-853, 10/04/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, IPREM, UPPA, INC-CNRS, CNRS, UPPA
Etude expérimentale de la célérité des vagues en zone de surf
L'estimation de la célérité des vagues en zone de surf est une étape essentielle dans la modélisation de la circulation littorale. Nous présentons une étude de ce paramètre basée sur les données de la campagne de mesure internationale ECORS 2008. En particulier, nous analysons, pour des houles très energétiques, l'influence des non-linéarités et évaluons plusieurs modèles prédictifs de célérité. Enfin, nous discutons l'influence des pulsations très basse-fréquence de la circulation sur la célérité.
(10/04/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Holocene glacier and deep water dynamics, Adélie Land region, East Antarctica
This study presents a high-resolution multi-proxy investigation of sediment core MD03-2601 and documents major glacier oscillations and deep water activity during the Holocene in the Ade ´lie Land region, East Antarctica. A comparison with surface ocean conditions reveals synchronous changes of glaciers, sea ice and deep water formation at Milankovitch and sub-Milankovitch time scales. We report (1) a deglaciation of the Ade ´lie Land continental shelf from 11 to 8.5 cal ka BP, which occurred in two phases of effective glacier grounding-line retreat at 10.6 and 9 cal ka BP, associated with active deep water formation; (2) a rapid glacier and sea ice readvance centred around 7.7 cal ka BP; and (3) five rapid expansions of the glacier-sea ice systems, during the Mid to Late Holocene, associated to a long-term increase of deep water formation. At Milankovich time scales, we show that the precessionnal component of insolation at high and low latitudes explains the major trend of the glacier-sea ice-ocean system throughout the Holocene, in the Ade ´lie Land region. In addition, the orbitally-forced seasonality seems to control the coastal deep water formation via the sea ice-ocean coupling, which could lead to opposite patterns between north and south high latitudes during the Mid to Late Holocene. At sub-Milankovitch time scales, there are eight events of glacier-sea ice retreat and expansion that occurred during atmospheric cooling events over East Antarctica. Comparisons of our results with other peri-Antarctic records and model simulations from high southern latitudes may suggest that our interpretation on glacier-sea ice-ocean interactions and their Holocene evolutions reflect a more global Antarctic Holocene pattern.
(Quaternary Science Reviews. vol. 28, n° 0277-3791, pp. 1291 - 1303, 10/04/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, VU, FRE 2255
Holocene productivity changes off Adélie Land (East Antarctica)
This study presents the first high-resolution multiproxy investigation of primary productivity (PP) during the Holocene from the Antarctic continental margins. Micropaleontological and geochemical data from the sediment core MD03-2601, associated to sea ice model outputs, give unprecedented insights into the biological pump of the Antarctic coastal area off Adélie Land in response to climatic changes. Plurimillennial and millennial changes of PP are observed in the study area in response to changes in nutrient availability, stratification, and growing season duration, which are linked to sea ice, upwelling, wind, and glacier dynamics. The precessional cycle seems to be responsible in the PP long-term variations, while forcing factors involved at the millennial timescale remain more enigmatic. Our results emphasize enhanced biological pump during warmer and windier Holocene phases because of a longer growing season and greater nutrient input. Antarctic coastal and continental shelf zones may therefore represent a more intense carbon sink in the future.
(Paleoceanography. vol. 24, n° 0883-8305, pp. PA3207, 10/04/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, VU
Field observations of an evolving rip current on a meso-macrotidal well-developed inner bar and rip morphology
The Aquitanian Coast (France) is a high-energy meso-macrotidal environment exhibiting a highly variable double sandbar system. The inner and the outer bar generally exhibit a bar and rip morphology and persistent crescentic patterns, respectively. In June 2007, an intense five-day field experiment was carried out at Biscarrosse Beach. A large array of sensors was deployed on a well-developed southward-oriented bar and rip morphology. Daily topographic surveys were carried out together with video imaging to investigate beach morphodynamic evolution. During the experiment, offshore significant wave height ranged from 0.5 to 3 m, with a persistent shore-normal angle. This paper identifies two types of behavior of an observed rip current: (1) for low-energy waves, the rip current is active only between low and mid tide with maximum mean rip current velocity reaching 0.8 m/s for an offshore significant wave height (Hs) lower than 1 m; (2) for high-energy waves (Hs≈ 2.5–3 m), the rip current was active over the whole tide cycle with the presence of persistent intense offshore-directed flows between mid and high tide. For both low and high-energy waves, very low-frequency pulsations (15–30 min) of the mean currents are observed on both feeder and rip channels. A persistent slow shoreward migration of the sandbar was observed during the experiment while no significant alongshore migration of the system was measured. Onshore migration during the high-energy waves can be explained by different sediment transport processes such as flow velocity skewness, wave asymmetry or bed ventilation. High-frequency local measurements of the bed evolution show the presence of significant (in the order of 10 cm) fluctuations (in the order of 1 h). These fluctuations, observed for both low- and high-energy waves, are thought to be ripples and megaripples, respectively and may play an important but still poorly understood role in the larger scale morphodynamics. The present dataset improves the knowledge of rip dynamics as well as the morphological response of strongly alongshore non-uniform meso-macrotidal beaches.
(Continental Shelf Research. vol. 29, n° 0278-4343, pp. p. 1650-1662, 10/04/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, BRGM
Imprints of high-salinity water plumes originating from the Red Sea during termination II.
(Palaeogeography, Palaeoclimatology, Palaeoecology. vol. 279, n° 0031-0182, pp. 69-79, 10/04/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, CR2P, MNHN, UPMC, CNRS, IPNO, UP11, IN2P3, CNRS, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, PALEOCEAN, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA
The Adour-Garonne Basin : Chap 5.3
Cette monographie du Bassin hydrographique Adour-Garonne comprend une introduction sur le contexte géographique, hydrographique et sociétal du bassin in cluant de courtes signalétiques des grosses villes et de leur relation à l'hydrosystème. Le 1er chapitre décrit les principales caractéristiques des cours d'eau du bassin (longueur, aire et caractéristiques du bassin versant). Ensuite sont successivement abordés des aspects historiques de l'occupation de ces bassins ; une description biogéographique, la géologie, le climat et les usages du sol ; la géomorphologie, l'hydrologie et l'hydrochimie-biogéochimie ; la biodiversité aquatique et riparienne, avec une signalétique sur chaque grand maillon biologique concerné : végétation riparienne, Phytobenthos et phytoplancton, macrophytes aquaatiques, macro-invertébrés, poissons et oiseaux. Enfin, un chapitre fait l'état d'éléments de gestion du Bassin, sur des aspects et enjeux économiques d'une part, sur la politique de protection des zones naturelles et enfin sur lles spécificités de mise en application de la Directive Européenne sur l'Eau sur l'hydrosystème Adour-Garonne.
(pp. 182-198, 10/04/2026)
CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, UR REBX, CEMAGREF, UR EPBX, CEMAGREF, INRA
Use of voltametric solid-state microelectrode for studying the effect of tidal forcing on biogeochemical processes on mudflat of the arcachon bay (France)
(10/04/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, EDF R&D STEP, EDF R&D, EDF [E.D.F.], LPGN, UN, CNRS, LOBB, OOB, UPMC, CNRS, UPMC, INSU - CNRS, CNRS
Ocean color measurements onboard a jet-ski : consistency for calval exercise of high-resolution satellite imagery?
(. vol. 7150, pp. Vol. 7150, Q1Q10, doi:10.1117/12.805382, 10/04/2026)
CRC, UB, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Last glacial fire regime variability in western France inferred from microcharcoal preserved in core MD04-2845, Bay of Biscay
High resolution multiproxy analysis (microcharcoal, pollen, organic carbon, Neogloboquadrina pachyderma (s) , ice rafted debris) of the deep-sea record MD04-2845 (Bay of Biscay) provides new insights for understanding mechanisms of fire regime variability of the last glacial period in western France. Fire regime of western France closely follows Dansgaard–Oeschger climatic variability and presents the same pattern than that of southwestern Iberia, namely low fire regime associated with open vegetation during stadials including Heinrich events, and high fire regime associated with open forest during interstadials. This supports a regional climatic control on fire regime for western Europe through fuel availability for the last glacial period. Additionally, each of Heinrich events 6, 5 and 4 is characterised by three episodes of fire regime, with a high regime bracketed by lower fire regime episodes, related to vegetational succession and complex environmental condition changes.
(Quaternary Research. vol. 71, n° 0033-5894, pp. 385-396, 10/04/2026)
PACEA, UB, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS