A simple and accurate nonlinear method for recovering the surface wave elevation from pressure measurements
(30/07/2018)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, IMB, UB, Bordeaux INP, CNRS, LIENSs, INSU - CNRS, ULR, CNRS, LEGI, Grenoble INP, CNRS, UGA [2016-2019]
Monsoonal Forcing of European Ice‐Sheet Dynamics During the Late Quaternary
(Geophysical Research Letters. vol. 45, n° 0094-8276, pp. 7066-7074, 24/07/2018)
IMCCE, INSU - CNRS, CNRS, PSL, SU, CNRS, GM, IFREMER, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, NOC
Kromdraai, a Plio-Pleistocene cave deposit in the Cradle of Humankind World Heritage Site, South Africa
(09/07/2018)
WITS, UT3, Comue de Toulouse, Inrap, UP, TRACES, EHESS, UT2J, Comue de Toulouse, MCC, Inrap, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, OASU, UB, INSU - CNRS, ULR, CNRS, INRAE
Mise en œuvre d’un outil intégratif permettant la quantification et la spatialisation des apports azotés influençant un captage d’alimentation en eau potable –Approche à l’échelle de l’hydrosystème karstique des Sources du Toulon (Périgueux, France)
(pp. 118-119, 02/07/2018)
I2M-BX, UB, CNRS, INRAE, UB, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, SNO Karst, INSU - CNRS, SU
VSI: Environmental concentrations, cycling and modeling of technology critical elements
Tailings containing mining and ore treatment waste, accumulated over long time periods are major contaminant sources at the watershed scale and may seriously impair environmental quality of river-sea continuums. A critical review of existing work in different disciplines addressing the multi-metal contamination of the Gironde Watershed, a major fluvial-estuarine model system representative of many other systems worldwide, has provided a condensed, yet pertinent overview on various aspects of this environmental problem. Combining long-term observation and contamination records from different environmental archives, there is a clear trend towards resilience for the main historical contaminants (Cd, Zn, Pb and Cu), yet suggesting that resilience needs appropriate management of both, tailings as the initial source and contaminated sediments acting as temporary metal traps which may transform into delayed sources. Contaminated sediment management is an increasingly important challenge due to (i) successful remediation at the contamination source itself (ii) global-change induced factors and strategies and (iii) lacking coordination of actions between upstream and downstream parts of the fluvial-estuarine continuum. Less studied and emerging metallic contaminants show recent trends in sediments and biota that are decoupled from the legacy contaminant trajectories due to recent sources and applications, suggesting that further work is needed to assess their potential impact on the environmental quality of the Gironde fluvial-estuarine system and that of other systems, especially in a context of worldwide rapidly growing mining activity and metal use.
(Science of the Total Environment. vol. 630, n° 0048-9697, pp. 32, 01/07/2018)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Spatio-temporal variation of trematode parasites community in Cerastoderma edule cockles from Ria de Aveiro (Portugal)
Cerastoderma edule (edible cockle) is among the most exploited bivalves in Europe playing an important socio-economic role. Cockles live in estuaries and lagoons where their population is controlled by several environmental factors including parasitism. Parasites represent an important part of the world known biodiversity but are often neglected. Trematodes are the most prevalent macroparasites of cockles being able to exert an impact both at the individual and population levels. Therefore, it is of prime relevance to recognize and understand the parasite-host system dynamics in order to better predict potential conservation threats to bivalve populations and to maximize the success of stock and disease episodes management. Cockle monitoring was conducted in 2012 and 2016, in six and eight stations, respectively, at the Ria de Aveiro coastal lagoon, Portugal. Cockles were sampled in one single occasion in 2012 and seasonally in 2016. The tested hypothesis is that the trematode community in cockles was spatially and seasonally heterogeneous but stable over time. The main result showed that despite a relative homogeneity of the parasite community structure in cockles, the among-years heterogeneity of trematode communities was higher than among-stations and among-seasons heterogeneity rejecting the postulated hypothesis. Results demonstrated that trematode communities from the Ria de Aveiro are characterized by low abundance, which resulted in a spatial and seasonal trematode homogeneity (despite an overall channel difference and a slight downstream-upstream gradient). The interannual analysis showed a worrisome loss of trematode diversity and prevalence which consequently indicates an important loss of overall diversity and/or environmental conditions reflecting the negative effects of global change (mean temperature rise and overharvesting, among others). The present study highlighted the importance of trematodes in characterising their associated environment and respective biodiversity which might be helpful to assess ecosystem ecological status and to identify threatened areas.
(Environmental Research. vol. 164, n° 0013-9351, pp. 114-123, 01/07/2018)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Palaeoclimate constraints on the impact of 2 °C anthropogenic warming and beyond
Over the past 3.5 million years, there have been several intervals when climate conditions were warmer than during the pre-industrial Holocene. Although past intervals of warming were forced differently than future anthropogenic change, such periods can provide insights into potential future climate impacts and ecosystem feedbacks, especially over centennial-to-millennial timescales that are often not covered by climate model simulations. Our observation-based synthesis of the understanding of past intervals with temperatures within the range of projected future warming suggests that there is a low risk of runaway greenhouse gas feedbacks for global warming of no more than 2 °C. However, substantial regional environmental impacts can occur. A global average warming of 1–2 °C with strong polar amplification has, in the past, been accompanied by significant shifts in climate zones and the spatial distribution of land and ocean ecosystems. Sustained warming at this level has also led to substantial reductions of the Greenland and Antarctic ice sheets, with sea-level increases of at least several metres on millennial timescales. Comparison of palaeo observations with climate model results suggests that, due to the lack of certain feedback processes, model-based climate projections may underestimate long-term warming in response to future radiative forcing by as much as a factor of two, and thus may also underestimate centennial-to-millennial-scale sea-level rise.
(Nature Geoscience. vol. 11, n° 1752-0894, pp. 474 - 485, 01/07/2018)
CEP, UNIBE, OCCR, UNIBE, CCRC, UNSW, CEOAS, OSU, ANU, CAM, MPI-M, BAS, NERC, NBI, UCPH, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LDEO, MARUM, UNIVERSITé DE DURHAM, AWI, CAM, UNIGE, UNIL, GEOTOP, EPM, UdeM, UQAT, UQAR, UQAM, USC, UAM, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, GLACCIOS, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, NCAR, PSL, CAU, UFZ, UNIBE, NZC, IAP, CAS
Living (stained) deep-sea foraminifera from the Sea of Marmara: A preliminary study
In this preliminary study, we investigate living (stained) foraminifera from the Sea of Marmara. We focus on the faunal composition and geochemical signatures (trace elements, carbon and oxygen stable isotopes) in foraminiferal tests at two deep-sea sites (329 and ~ 1240 m depth respectively). Documented by ROV observations and sampling, both study areas are heterogeneous (including bacterial mats and carbonate concretions), proximal to cold seeps and consist of dysoxic bottom water (O2 < 20 µmol/L). The prevailing dysoxia at both study areas restricts foraminiferal diversity to very low values (S < 9, H’ < 0.97). Stress-tolerant species Bolivina vadescens and Globobulimina affinis dominate living faunas at both sites. The highest foraminiferal standing stock is recorded at the shallowest site underneath a spreading bacterial mat. No benthic foraminifera from either site possess geochemical signatures of methane seepage. Our biogeochemical results show that use of foraminiferal Mn/Ca ratios as a proxy for bottom water oxygenation depends strongly on regional physiography, sedimentary processes and water column structure.
(Deep Sea Research Part II: Topical Studies in Oceanography. vol. 153, n° 0967-0645, pp. 61-78, 01/07/2018)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LOCEAN-VALCO, LOCEAN, MNHN, IRD, INSU - CNRS, SU, CNRS, IPSL (FR_636), ENS-PSL, UVSQ, CEA, INSU - CNRS, X, CNES, SU, CNRS, UPCité, GM, IFREMER, iSTeP, INSU - CNRS, SU, CNRS, LEP, EEP, IFREMER, LM2E, IFREMER, UBO EPE, CNRS
A mega-cryptic species complex hidden among one of the most common annelids in the North East Atlantic
We investigate mitochondrial (COI, 16S rDNA) and nuclear (ITS2, 28S rDNA) genetic structure of North East Atlantic lineages of Terebellides, a genus of sedentary annelids mainly inhabiting continental shelf and slope sediments. We demonstrate the presence of more than 25 species of which only seven are formally described. Species boundaries are determined with molecular data using a broad range of analytical methods. Many of the new species are common and wide spread, and the majority of the species are found in sympatry with several other species in the complex. Being one of the most regularly encountered annelid taxa in the North East Atlantic, it is more likely to find an undescribed species of Terebellides than a described one.
(PLoS ONE. vol. 13, n° 1932-6203, pp. e0198356, 20/06/2018)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS