Marie-Laure Rouget's research while affiliated with Université de Bretagne Occidentale and other places

Publications (17)

Article
We document for the first time, the spatial distribution at basin scale (North tropical Atlantic Ocean) of As, P and trace metal (TM) concentrations in the three morphotypes belonging to the two holopelagic species Sargassum natans and S. fluitans and three morphotypes: S. natans VIII, S. natans I and S. fluitans III. These samples collected in the...
Article
Seagrass beds are increasingly impacted by human activities in coastal areas, particularly in tropical regions. The objective of this research program was to study seagrass beds characteristics under various environmental conditions in the French Antilles (FA, Caribbean Sea). A total of 61 parameters, from plant physiology to seagrass ecosystem, we...
Article
The determination of rare earth elements (REEs) and Y in carbonates can be complicated by low REE abundances and the presence of significant amounts of Ba resulting in problematic interferences when analyzed by ICP-MS. We describe here a novel ion-exchange method using the DGA resin (TODGA), combined with addition of a Tm spike, which allows the se...
Poster
Full-text available
Mayotte Island is located in Comoros archipelago and shelters multispecific meadow where nine seagrass species inhabit and which are frequented by their grazers the green turtle (Chelonia mydas) and more rarely by the dugong (Dugong dugon). With the increase of demography and coastal activities, the conservation of this threatened lagoon habitat an...
Technical Report
Full-text available
Article en page 8 de la newsletter. La mutualisation des actions nationales « herbiers » de l’Ifrecor et de la DCE a conduit au lancement d’une phase de recherche et développement afin de développer des protocoles et des indicateurs sur les herbiers répondant aux objectifs de ces deux programmes. C’est dans ce cadre que la thèse intitulée « Dévelo...
Technical Report
Full-text available
Article en page 24 de la newsletter. La mutualisation des actions de l'Ifrecor et de la DCE a conduit au lancement d’une phase de recherche et développement afin de développer des protocoles et des indicateurs « herbiers ». C’est dans ce cadre que la thèse intitulée « Développement d’outils méthodologiques pour le suivi et l’évaluation de l’état d...
Article
Impacted marine environments lead to metal accumulation in edible marine fish, ultimately impairing human health. Nevertheless, metal accumulation is highly variable among marine fish species. In addition to ecological features, differences in bioaccumulation can be attributed to species-related physiological processes, which were investigated in t...
Article
Ureilites are among the most common achondrites and are widely believed to sample the mantle of a single, now-disrupted, C-rich body. We analyzed 17 ureilite samples, mostly Antarctic finds, and determined their incompatible trace element abundances. In order to remove or reduce the terrestrial contamination, which is marked among Antarctic ureilit...
Article
We report the abundances of a selected set of “lithophile” trace elements (including lanthanides, actinides and high field strength elements) and high-precision oxygen isotope analyses of a comprehensive suite of aubrites. Two distinct groups of aubrites can be distinguished: (a) the main-group aubrites display flat or light-REE depleted REE patter...
Article
Ferromanganese (Fe-Mn) crusts are potential archive of the Ni isotope composition of seawater through time. In this study we aim at (1) understanding Ni isotope fractionation mechanisms and metal enrichment processes in Fe-Mn deposits, (2) addressing global vs. local control of Ni isotope composition of these deposits. Two Fe-Mn crusts from the Nor...
Article
Over the past decades, rare earth elements (REE) and their radioactive isotopes have received tremendous attention in sedimentary geochemistry, as tracers for the geological history of the continental crust and provenance studies. In this study, we report on elemental concentrations and neodymium (Nd) isotopic compositions for a large number of sed...
Article
Rationale: Understanding the fate of metals in agricultural land is an important issue for agronomic sustainability. This study aimed at quantifying the export/retention of metals in a temperate watershed subject to important manuring activities. Methods: The chemical composition of the Penzé stream was examined at high resolution during a 1-year s...
Article
Seawater samples were collected by submersible above methane seeps in the Gulf of Guinea (Regab and Baboon pockmarks) in order to investigate the behaviour of iron (Fe), manganese (Mn) and rare earth elements (REE) during fluid seepage. Our aim was to determine whether cold seeps may represent potential sources of dissolved chemical species to the...
Article
We report rare earth element (REE) and neodymium (Nd) isotope data for the organic fraction of sediments collected from various depositional environments, i.e. rivers (n = 25), estuaries (n = 18), open-ocean settings (n = 15), and cold seeps (n = 12). Sedimentary organic matter (SOM) was extracted using a mixed hydrogen peroxide/nitric acid solutio...

Citations

... Thus, longer monitoring after a change in light availability in seagrass beds is recommended. Early investigations also suggested that integrating biomarkers across biological organizations is effective in assessing impacts of various stressors on seagrass health (Schubert et al., 2018;Kerninon et al., 2021;Yucharoen et al., 2021). These topics deserve further investigation. ...
... All of these rocks were analyzed using the same procedure and calibration to avoid any potential analytical bias (e.g., Barrat et al., 2012). Based on replicate analyses of standard reference materials and samples (e.g., Barrat et al., 2012Barrat et al., , 2016Barrat et al., , 2020Charles et al., 2021), the precision for abundances is typically much better than 5%, and 3% for element ratios (one relative standard deviation -RSD), including La/La* and Ce/Ce*. Finally, and obviously most importantly, these rocks do not have Ce, nor La anomalies: their "correct" La/La* or Ce/Ce* ratios are hence ~1. ...
... We used these data to compare authigenic carbonate samples collected from different regions worldwide instead of those normalized to associated carbonate fractions (Fig. S5). Although W was not detected in our total lipid samples of the CB, this element is included because pronounced lipid-bound W anomalies are reported at other seep sites worldwide 20 . PCA was also performed using the archaeal and bacterial lipid data to compare the CB signatures with those from other cold seeps 20 (Fig. 5b-c). ...
... Fish species and strains have shown genetic variation in disease resistance and stress response. Moreover, the ability of different fish species to cope with Cd toxicity has been documented in many recent studies (Andres et al., 2000;Le Croizier et al., 2019). In the present study, genotype-specific responses were identified regarding the strategy of alleviating hepatoxicity in the two strains, as significantly higher expression of ER stress biomarkers atf6 and bip in the F strain was detected. ...
... Once the metal(loid) is ingested, uptake occurs in the intestinal tissue through membranes via transporter proteins or/and ionic channels (Le Croizier et al., 2018). Thus, dietary accumulation initiates in the digestive tract. ...
... Furthermore, Grove (2020a, 2020b) showed experimentally that incremental melting (with small increments of~2-5 wt%, approaching fractional melting) of chondritic materials produces characteristic properties of main group ureilites that batch melting cannot, in particular the dominance of pigeonite as the main pyroxene at temperatures above 1200°C (Goodrich, 1999). Based on this experimental work, combined with the mineralogy and equilibration temperatures of main group ureilites and their bulk rare earth element (REE) concentrations (Barrat et al., 2016), cumulative degree of melting ranged from~15 to 24 wt% (Collinet & Grove, 2020a). Plagioclase was completely eliminated from the source regions at~15 wt% melting (~1120-1160°C, depending on Mg#), after which the rate of melt extraction (as a function of time) decreased significantly due to the removal of the main heat source, 26 Al (Collinet & Grove, 2020b;Goodrich, Hartmann, et al., 2015;Wilson et al., 2008) and the decrease in melt productivity (as a function of temperature increase) following the disappearance of plagioclase (Collinet & Grove, 2020a). ...
... Methods such as the use of high-throughput fluorescence (e.g., sonde measurements of chlorophyll-a and phycocyanin RFUs [185]) and fatty acid profiles [186,187] can similarly provide coarse estimates of total relative abundances of cyanobacteria, heterotrophic bacteria, and fungi in aquatic systems. Combined with environmental tracers (e.g., radiolabeled nutrients and toxins [188]), these methods may provide valuable insights into processes such as nutrient cycling and bioaccumulation in aquatic food webs [189,190]. ...
... In addition to Um Hadid, Mount Padbury, and Estherville, 6 other mesosiderites were selected for oxygen isotopic analysis (Fig. 6 (Greenwood et al., 2006a(Greenwood et al., , 2006b(Greenwood et al., , 2015Scott et al., 2009;Barrat et al., 2016). ...
... Ni isotope measurements of United States Geological Survey (USGS) Mn-nodule geostandards Nod-A-1 and Nod-P-1 were performed as unknown samples and we obtained δ 60 Ni = 1.09 ± 0.06‰ and 0.41 ± 0.06‰, respectively, similar within uncertainty to previously published values (e.g. Gueguen et al., 2016). We also measured internal Ni standard solutions (Spex solution) after complete Ni separation through the columns and we obtained δ 60 Ni = 0.04 ± 0.04‰, identical within uncertainty to unprocessed standard solution. ...
... Most igneous rocks and terrestrial sediments lie along a single correlation trend in a 143 Nd/ 144 Nd (or ε Nd in epsilon notation) versus 176 Hf/ 177 Hf (ε Hf ) plot, defined as the 'Terrestrial Array' (ε Hf = 1.55 ×ε Nd + 1.21) (Fig. 2) (Vervoort et al., 2011). While the Nd isotopic composition of fine-grained detrital sediments remains mostly unchanged during continental erosion, sediment transport and deposition (e.g., Bayon et al., 2015), Hf isotopes are strongly affected by preferential sorting of Hf-bearing zircon into coarse sediments during transport processes (e.g., Bayon et al., 2009;Garç on et al., 2013). Because zircons are typically characterized by unradiogenic signatures (with low ε Hf ) and dominate the Hf budget in detrital sediments, sediment transport hence results in zircon-depleted clay-size sediment fractions exhibiting much higher ε Hf composition than corresponding zircon-bearing silts, defining a so-called 'Clay Array' in the ε Nd versus ε Hf plot (ε Hf = 0.78 ×ε Nd + 5.23; Zhao et al., 2014;Bayon et al., 2016). ...