30 results on '"Cathalot, C."'
Search Results
2. Endogenous versus exogenous factors: What matters for vent mussel communities?
- Author
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Sarrazin, J., Portail, M., Legrand, E., Cathalot, C., Laes, A., Lahaye, N., Sarradin, P.M., and Husson, B.
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- 2020
- Full Text
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3. Metal partitioning after in situ filtration at deep-sea vents of the Lucky Strike hydrothermal field (EMSO-Azores, Mid-Atlantic Ridge, 37°N)
- Author
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Cotte, L., Chavagnac, V., Pelleter, E., Laës-Huon, A., Cathalot, C., Dulaquais, G., Riso, R.D., Sarradin, P.-M., and Waeles, M.
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- 2020
- Full Text
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4. Population structure and environmental niches of Rimicaris shrimps from the Mid-Atlantic Ridge
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Methou, P, primary, Hernández-Ávila, I, additional, Cathalot, C, additional, Cambon-Bonavita, MA, additional, and Pradillon, F, additional
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- 2022
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5. Population structure and environmental niches of Rimicaris shrimps from the Mid Atlantic Ridge
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Bonavita Mc, Avila Ih, Florence Pradillon, Methou P, and Cathalot C
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0106 biological sciences ,Ecological niche ,education.field_of_study ,Ecology ,010604 marine biology & hydrobiology ,Fauna ,Population ,Mid-Atlantic Ridge ,Biology ,010603 evolutionary biology ,01 natural sciences ,Predation ,Abundance (ecology) ,14. Life underwater ,education ,Hydrothermal vent ,Trophic level - Abstract
Among the endemic and specialized fauna from hydrothermal vents, Rimicaris shrimp surely constitutes one of the most important and emblematic components of these ecosystems. In the Mid Atlantic Ridge, two species affiliated to this genus co-occur: Rimicaris exoculata and Rimicaris chacei that differ by their morphology, their trophic regime as well as by their abundance. The first forms large and dense aggregations on active vent chimney walls in close proximity to vent fluid emissions, whereas the second is recognized as much less conspicuous, living mostly in scattered groups or solitary further away from the fluids. However, the recent revision of Rimicaris juvenile stages from the Mid Atlantic Ridge shows that R. chacei abundance would be higher than expected at these early life stages. Here, we describe and compare the population structures of R. exoculata and R. chacei at the Snake Pit and TAG vent fields. We show distinct population demographics between the two co-occurring shrimps with a large post settlement collapse in R. chacei population suggesting a large juvenile mortality for this species. We also observe important spatial segregation patterns between the two species and their different life stages. Additionally, our results highlight distinct niches for the earliest juvenile stages of both R. exoculata and R. chacei, compared to all the other life stages. Finally, we discuss the potential factors - predation and competitive interactions among others - that could explain the differences we observe in the population structure of these two species.
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- 2021
6. Cryptic frenulates are the dominant chemosymbiotrophic fauna at Arctic and high latitude Atlantic cold seeps
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Svenning, Mette Marianne, Marticorena, J, Matabos, M, Ramirez-Llodra, E, Cathalot, C, Laes-Huon, A, Leroux, R, Donval, J-P, Sarrazin, J, Sen, Arunima, Duperron, Sébastien, Hourdez, Stéphane, Piquet, Bérénice, Léger, Nelly, Gebruk, Andrey, Le Port, Anne-Sophie, Svenning, Mette, Andersen, Ann, IFREMER- Département Etude des Ecosystèmes Profonds (DEEP/LEP), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Systématique, adaptation, évolution (SAE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Adaptation et Biologie des Invertébrés en Conditions Extrêmes (ABICE), Adaptation et diversité en milieu marin (AD2M), Station biologique de Roscoff [Roscoff] (SBR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Station biologique de Roscoff [Roscoff] (SBR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Adaptation aux milieux extrêmes, Station biologique de Roscoff (SBR), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Station biologique de Roscoff (SBR), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Station biologique de Roscoff (SBR), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
0106 biological sciences ,European People ,Fauna ,Speciation ,Trophosome ,Morphology (biology) ,[SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy ,01 natural sciences ,RNA, Ribosomal, 16S ,Ethnicities ,VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 ,Electron Microscopy ,Phylogeny ,Data Management ,Sedimentary Geology ,Microscopy ,Multidisciplinary ,Latitude ,biology ,Fluorescent in Situ Hybridization ,Geography ,Arctic Regions ,Norway ,Phylogenetic Analysis ,Geology ,Cold Temperature ,Phylogenetics ,RNA, Bacterial ,Chemistry ,Physical Sciences ,Medicine ,Scanning Electron Microscopy ,Energy source ,Research Article ,Cartography ,Computer and Information Sciences ,Evolutionary Processes ,Norwegian People ,Science ,Oceans and Seas ,Zoology ,Molecular Probe Techniques ,Sulfides ,Research and Analysis Methods ,010603 evolutionary biology ,DNA, Mitochondrial ,Cryptic Speciation ,Animals ,Evolutionary Systematics ,14. Life underwater ,Symbiosis ,Molecular Biology Techniques ,Molecular Biology ,Taxonomy ,Petrology ,Evolutionary Biology ,Bacteria ,Host (biology) ,010604 marine biology & hydrobiology ,Chemical Compounds ,Biology and Life Sciences ,Polychaeta ,VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 ,biology.organism_classification ,Cold seep ,Probe Hybridization ,[SDV.BA.ZI]Life Sciences [q-bio]/Animal biology/Invertebrate Zoology ,Arctic ,People and Places ,Earth Sciences ,Population Groupings ,Sediment ,Cytogenetic Techniques - Abstract
Source at https://doi.org/10.1371/journal.pone.0209273. We provide the first detailed identification of Barents Sea cold seep frenulate hosts and their symbionts. Mitochondrial COI sequence analysis, in combination with detailed morphological investigations through both light and electron microscopy was used for identifying frenulate hosts, and comparing them to Oligobrachia haakonmosbiensis and Oligobrachia webbi, two morphologically similar species known from the Norwegian Sea. Specimens from sites previously assumed to host O. haakonmosbiensis were included in our molecular analysis, which allowed us to provide new insight on the debate regarding species identity of these Oligobrachia worms. Our results indicate that high Arctic seeps are inhabited by a species that though closely related to Oligobrachia haakonmosbiensis, is nonetheless distinct. We refer to this group as the Oligobrachia sp. CPL-clade, based on the colloquial names of the sites they are currently known to inhabit. Since members of the Oligobrachia sp. CPL-clade cannot be distinguished from O. haakonmosbiensis or O. webbi based on morphology, we suggest that a complex of cryptic Oligobrachia species inhabit seeps in the Norwegian Sea and the Arctic. The symbionts of the Oligobrachia sp. CPL-clade were also found to be closely related to O. haakonmosbiensis symbionts, but genetically distinct. Fluorescent in situ hybridization and transmission electron micrographs revealed extremely dense populations of bacteria within the trophosome of members of the Oligobrachia sp. CPL-clade, which is unusual for frenulates. Bacterial genes for sulfur oxidation were detected and small rod shaped bacteria (round in cross section), typical of siboglinid-associated sulfur-oxidizing bacteria, were seen on electron micrographs of trophosome bacteriocytes, suggesting that sulfide constitutes the main energy source. We hypothesize that specific, local geochemical conditions, in particular, high sulfide fluxes and concentrations could account for the unusually high symbiont densities in members of the Oligrobrachia sp. CPL-clade.
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- 2018
7. On the early fate of hydrothermal iron at deep-sea vents: A reassessment after in situ filtration
- Author
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Waeles, Matthieu, Cotte, L., Pernet-Coudrier, B., Chavagnac, V., Cathalot, C., Leleu, T., Laes-Huon, A., Perhirin, A., Riso, Ricardo, Sarradin, P.-M., Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Environnement Profond (LEP), Etudes des Ecosystèmes Profonds (EEP), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Géosciences Environnement Toulouse (GET), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Laboratoire Géochimie et Métallogénie (LGM), Géosciences Marines (GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), ANR-14-CE02-0008,LuckyScales,De la chambre magmatique aux micro-habitats: dynamique des écosystèmes hydrothermaux marins profonds(2014), European Project: 211816,EC:FP7:INFRA,FP7-INFRASTRUCTURES-2007-1,EMSO(2008), Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Brest (UBO), IFREMER- Département Etude des Ecosystèmes Profonds (DEEP/LEP), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
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filtration ,[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere ,mechanisms ,hydrothermal ,sulfide ,ACL ,Iron ,east pacific rise ,precipitation ,venting ,ocean ,fe ,pyrite ,iron ,dissolved iron ,Metals ,plumes ,mid-atlantic ridge ,[SDE.BE]Environmental Sciences/Biodiversity and Ecology - Abstract
WOS:000402143700032; International audience; Deep-sea hydrothermal venting is now recognized as a major source of iron (Fe), an essential trace element that controls marine productivity. However, the reactions occurring during dispersal from buoyant plumes to neutrally buoyant hydrothermal plumes are still poorly constrained. Here we report for the first time on the dissolved-particulate partition of Fe after in situ filtration at the early stage of mixing at different hydrothermal discharges, i.e., Lucky Strike (37 degrees N), TAG (26 degrees N), and Snakepit (23 degrees N) on the Mid-Atlantic Ridge. We found that hydrothermal iron is almost completely preserved (\textgreater90%) in the dissolved fraction, arguing for low iron-bearing sulfide precipitation of iron in basalt-hosted systems with low Fe:H2S ratios. This result can only be explained by a kinetically limited formation of pyrite. The small part of Fe being precipitated as sulfides in the mixing gradient (\textless10%) is restricted to the inclusion of Fe in minerals of high Cu and Zn content. We also show that secondary venting is a source of Fe-depleted hydrothermal solutions. These results provide new constrains on Fe fluxes from hydrothermal venting.
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- 2017
8. The Congolobe project, a multidisciplinary study of Congo deep-sea fan lobe complex: Overview of methods, strategies, observations and sampling
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Rabouille, C., primary, Olu, K., additional, Baudin, F., additional, Khripounoff, A., additional, Dennielou, B., additional, Arnaud-Haond, S., additional, Babonneau, N., additional, Bayle, C., additional, Beckler, J., additional, Bessette, S., additional, Bombled, B., additional, Bourgeois, S., additional, Brandily, C., additional, Caprais, J.C., additional, Cathalot, C., additional, Charlier, K., additional, Corvaisier, R., additional, Croguennec, C., additional, Cruaud, P., additional, Decker, C., additional, Droz, L., additional, Gayet, N., additional, Godfroy, A., additional, Hourdez, S., additional, Le Bruchec, J., additional, Saout, J., additional, Le Saout, M., additional, Lesongeur, F., additional, Martinez, P., additional, Mejanelle, L., additional, Michalopoulos, P., additional, Mouchel, O., additional, Noel, P., additional, Pastor, L., additional, Picot, M., additional, Pignet, P., additional, Pozzato, L., additional, Pruski, A.M., additional, Rabiller, M., additional, Raimonet, M., additional, Ragueneau, O., additional, Reyss, J.L., additional, Rodier, P., additional, Ruesch, B., additional, Ruffine, L., additional, Savignac, F., additional, Senyarich, C., additional, Schnyder, J., additional, Sen, A., additional, Stetten, E., additional, Sun, Ming Yi, additional, Taillefert, M., additional, Teixeira, S., additional, Tisnerat-Laborde, N., additional, Toffin, L., additional, Tourolle, J., additional, Toussaint, F., additional, Vétion, G., additional, Jouanneau, J.M., additional, and Bez, M., additional
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- 2017
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9. Early diagenesis in the sediments of the Congo deep-sea fan dominated by massive terrigenous deposits: Part III – Sulfate- and methane- based microbial processes
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Pastor, L., primary, Toffin, L., additional, Decker, C., additional, Olu, K., additional, Cathalot, C., additional, Lesongeur, F., additional, Caprais, J.-C., additional, Bessette, S., additional, Brandily, C., additional, Taillefert, M., additional, and Rabouille, C., additional
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- 2017
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10. Aquatic Eddy Correlation: Quantifying the Artificial Flux Caused by Stirring-Sensitive O2 Sensors
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Holtappels, Moritz, Noss, Christian, Hancke, Kasper, Cathalot, C, McGinnis, DF, Lorke, A, and Glud, Ronnie
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Oxygen ,stirring ,Science ,ddc:550 ,flux rates ,Medicine ,Research Article ,Eddy ,Correlation - Abstract
In the last decade, the aquatic eddy correlation (EC) technique has proven to be a powerful approach for non-invasive measurements of oxygen fluxes across the sediment water interface. Fundamental to the EC approach is the correlation of turbulent velocity and oxygen concentration fluctuations measured with high frequencies in the same sampling volume. Oxygen concentrations are commonly measured with fast responding electrochemical microsensors. However, due to their own oxygen consumption, electrochemical microsensors are sensitive to changes of the diffusive boundary layer surrounding the probe and thus to changes in the ambient flow velocity. The so-called stirring sensitivity of microsensors constitutes an inherent correlation of flow velocity and oxygen sensing and thus an artificial flux which can confound the benthic flux determination. To assess the artificial flux we measured the correlation between the turbulent flow velocity and the signal of oxygen microsensors in a sealed annular flume without any oxygen sinks and sources. Experiments revealed significant correlations, even for sensors designed to have low stirring sensitivities of ~0.7%. The artificial fluxes depended on ambient flow conditions and, counter intuitively, increased at higher velocities because of the nonlinear contribution of turbulent velocity fluctuations. The measured artificial fluxes ranged from 2-70 mmol m(-2) d(-1) for weak and very strong turbulent flow, respectively. Further, the stirring sensitivity depended on the sensor orientation towards the flow. For a sensor orientation typically used in field studies, the artificial flux could be predicted using a simplified mathematical model. Optical microsensors (optodes) that should not exhibit a stirring sensitivity were tested in parallel and did not show any significant correlation between O2 signals and turbulent flow. In conclusion, EC data obtained with electrochemical sensors can be affected by artificial flux and we recommend using optical microsensors in future EC-studies.
- Published
- 2015
11. Structure of the Demerara passive-transform margin and associated sedimentary processes. Initial results from the IGUANES cruise
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Loncke, L., primary, Maillard, A., additional, Basile, C., additional, Roest, W. R., additional, Bayon, G., additional, Gaullier, V., additional, Pattier, F., additional, Mercier de Lépinay, M., additional, Grall, C., additional, Droz, L., additional, Marsset, T., additional, Giresse, P., additional, Caprais, J. C., additional, Cathalot, C., additional, Graindorge, D., additional, Heuret, A., additional, Lebrun, J. F., additional, Bermell, S., additional, Marcaillou, B., additional, Sotin, C., additional, Hebert, B., additional, Patriat, M., additional, Bassetti, M. A., additional, Tallobre, C., additional, Buscail, R., additional, Durrieu de Madron, X., additional, and Bourrin, F., additional
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- 2015
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12. Origin of an enigmatic regional Mio-Pliocene unconformity on the Demerara plateau
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Pattier, F., primary, Loncke, L., additional, Imbert, P., additional, Gaullier, V., additional, Basile, C., additional, Maillard, A., additional, Roest, W.R., additional, Patriat, M., additional, Vendeville, B.C., additional, Marsset, T., additional, Bayon, G., additional, Cathalot, C., additional, Caprais, J.C., additional, Bermell, S., additional, Sotin, C., additional, Hebert, B., additional, Mercier de Lépinay, M., additional, Lebrun, J.F., additional, Marcaillou, B., additional, Heuret, A., additional, Droz, L., additional, Graindorge, D., additional, Poetisi, E., additional, and Berrenstein, H., additional
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- 2015
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13. Seasonal dynamics of carbon recycling in coastal sediments influenced by rivers: assessing the impact of flood inputs in the Rhône River prodelta
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Cathalot, C., Rabouille, C., Pastor, L., Deflandre, B., Viollier, E., Buscail, R., Treignier, C., and Pruski, A.
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0106 biological sciences ,010504 meteorology & atmospheric sciences ,13. Climate action ,010604 marine biology & hydrobiology ,01 natural sciences ,6. Clean water ,0105 earth and related environmental sciences - Abstract
The biogeochemical fate of the particulate organic inputs from the Rhône River was studied on a seasonal basis by measuring sediment oxygen uptake rates in the prodelta, both during normal and flood regimes. On a selected set of 10 stations in the prodelta and nearby continental shelf, in situ and laboratory measurements of sediment oxygen demand were performed in early spring and summer 2007 and late spring and winter 2008. In and ex situ sediment Diffusive Oxygen Uptakes (DOU) did not show any significant differences except for shallowest organic rich stations. DOU rates show highest values concentrated close to the river mouth (approx. 20 mmol O2 m-2 d-1) and decrease offshore to values around 4.5 mmol O2 m-2 d-1 preferentially in a south west direction, most likely as the result of the preferential transport of the finest riverine material. Total Oxygen Uptake (TOU) obtained from core incubation showed the same spatial pattern with an averaged TOU/DOU ratio of 1.2± 0.4. Over different seasons, spring summer and late fall, benthic mineralization rates presented this same stable spatial pattern. A flood of the Rhône River occurred in June 2008 and brought up to 30 cm of new soft muddy deposit. Right after this flood, sediment DOU rates close to the river mouth dropped from around 15–20 mmol O2 m-2 d-1 to values close to 10 mmol O2 m-2 d-1, in response to the deposition near the river outlet of low reactivity organic matter associated to fine material. Six months later, the oxygen distribution had relaxed back to its initial stage: the initial spatial distribution was found again underlining the active microbial degradation rates involved and the role of further deposits. These results highlight the rapid response to flood deposits in prodeltaic areas which may act as a suboxic sediment reactor and shorten the relaxation time.
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- 2009
14. The fate of river organic carbon in coastal areas: A study in the Rhône River delta using multiple isotopic (δ 13 C, Δ 14 C) and organic tracers
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Cathalot, C., primary, Rabouille, C., additional, Tisnérat-Laborde, N., additional, Toussaint, F., additional, Kerhervé, P., additional, Buscail, R., additional, Loftis, K., additional, Sun, M.-Y., additional, Tronczynski, J., additional, Azoury, S., additional, Lansard, B., additional, Treignier, C., additional, Pastor, L., additional, and Tesi, T., additional
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- 2013
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15. Temporal variability of live (stained) benthic foraminiferal faunas in a river-dominated shelf – Faunal response to rapid changes of the river influence (Rhône prodelta, NW Mediterranean)
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Goineau, A., primary, Fontanier, C., additional, Jorissen, F., additional, Buscail, R., additional, Kerhervé, P., additional, Cathalot, C., additional, Pruski, A. M., additional, Lantoine, F., additional, Bourgeois, S., additional, Metzger, E., additional, Legrand, E., additional, and Rabouille, C., additional
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- 2012
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16. Temporal variability of live (stained) benthic foraminiferal faunas in a river-dominated shelf – faunal response to rapid changes of the river influence (Rhône prodelta, NW Mediterranean)
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Goineau, A., primary, Fontanier, C., additional, Jorissen, F., additional, Buscail, R., additional, Kerhervé, P., additional, Cathalot, C., additional, Pruski, A. M., additional, Bourgeois, S., additional, Metzger, E., additional, Legrand, E., additional, and Rabouille, C., additional
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- 2011
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17. Modeling biogeochemical processes in sediments from the Rhône River prodelta area (NW Mediterranean Sea)
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Pastor, L., primary, Cathalot, C., additional, Deflandre, B., additional, Viollier, E., additional, Soetaert, K., additional, Meysman, F. J. R., additional, Ulses, C., additional, Metzger, E., additional, and Rabouille, C., additional
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- 2011
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18. Temporal variability of carbon recycling in coastal sediments influenced by rivers: assessing the impact of flood inputs in the Rhône River prodelta
- Author
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Cathalot, C., primary, Rabouille, C., additional, Pastor, L., additional, Deflandre, B., additional, Viollier, E., additional, Buscail, R., additional, Grémare, A., additional, Treignier, C., additional, and Pruski, A., additional
- Published
- 2010
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19. Seasonal dynamics of carbon recycling in coastal sediments influenced by rivers: assessing the impact of flood inputs in the Rhône River prodelta
- Author
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Cathalot, C., primary, Rabouille, C., additional, Pastor, L., additional, Deflandre, B., additional, Viollier, E., additional, Buscail, R., additional, Treignier, C., additional, and Pruski, A., additional
- Published
- 2009
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20. Structure of the Demerara passive-transform margin and associated sedimentary processes. Initial results from the IGUANES cruise
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Loncke, L., Maillard, A., Basile, C., Roest, W. R., Bayon, G., Gaullier, V., Pattier, F., Mercier de Lépinay, M., Grall, C., Droz, L., Marsset, T., Giresse, P., Caprais, J. C., Cathalot, C., Graindorge, D., Heuret, A., Lebrun, J. F., Bermell, S., Marcaillou, B., Sotin, C., Hebert, B., Patriat, M., Bassetti, M. A., Tallobre, C., Buscail, R., Durrieu de Madron, X., and Bourrin, F.
- Abstract
The IGUANES cruise took place in May 2013 on the R/V L'Atalantealong the Demerara passive transform margin off French Guiana and Surinam. Seismic, multibeam and chirp acquisitions were made. Piston cores were collected for pore geochemistry and sedimentology. A mooring was deployed on the sea-bottom for 10 months (temperature, salinity, turbidity and current measurements). This new dataset highlights the lateral variability of the 350 km-long Guiana–Surinam transform margin due to the presence of a releasing bend between two transform segments. The adjacent Demerara Plateau is affected by a 350 km-long giant slide complex. This complex initiated in Cretaceous times and was regularly reactivated until recent times. Since the Miocene, contourite processes seem to be active due to the onset of the North Atlantic Deep Water (NADW) bottom current. A main NADW water vein flows towards SE, eroding slide headscarps and allowing the deposition of contourite drifts. Numerous depressions looking like comet tails or comet scours record this flow. Some of those were interpreted before the cruise as active pockmarks. Pore geochemistry and core analysis do not show any evidence of present-day gas seepage.
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- 2016
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21. The fate of river organic carbon in coastal areas: A study in the Rhône River delta using multiple isotopic (δ13C, °14C) and organic tracers.
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Cathalot, C., Rabouille, C., Tisnérat-Laborde, N., Toussaint, F., Kerhervé, P., Buscail, R., Loftis, K., Sun, M.-Y., Tronczynski, J., Azoury, S., Lansard, B., Treignier, C., Pastor, L., and Tesi, T.
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ORGANIC compounds , *COASTAL sediments , *CARBON , *DELTAS , *STABLE isotope tracers , *CARBON cycle , *POLYCYCLIC aromatic hydrocarbons - Abstract
Abstract: A significant fraction of the global carbon flux to the ocean occurs in River-dominated Ocean Margins (RiOMar) although large uncertainties remain in the cycle of organic matter (OM) in these systems. In particular, the OM sources and residence time have not been well clarified. Surface (0–1cm) and sub-surface (3–4cm) sediments and water column particles (bottom and intermediate depth) from the Rhône River delta system were collected in June 2005 and in April 2007 for a multi-proxy study. Lignin phenols, black carbon (BC), proto-kerogen/BC mixture, polycyclic aromatic hydrocarbons (PAHs), carbon stable isotope (δ13COC), and radiocarbon measurements (Δ14COC) were carried out to characterize the source of sedimentary organic material and to address degradation and transport processes. The bulk OM in the prodelta sediment appears to have a predominantly modern terrigenous origin with a significant contribution of modern vascular C3 plant detritus (Δ14COC =27.9‰, δ13COC =−27.4‰). In contrast, the adjacent continental shelf, below the river plume, seems to be dominated by aged OM (Δ14COC =−400‰, δ13COC =−24.2‰), and shows no evidence of dilution and/or replacement by freshly produced marine carbon. Our data suggest an important contribution of black carbon (50% of OC) in the continental shelf sediments. Selective degradation processes occur along the main dispersal sediment system, promoting the loss of a modern terrestrial OM but also proto-kerogen-like OM. In addition, we hypothesize that during the transport across the shelf, a long term resuspension/deposition loop induces efficient long term degradation processes able to rework such refractory-like material until the OC is protected by the mineral matrix of particles. [Copyright &y& Elsevier]
- Published
- 2013
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22. Temporal variability of live (stained) benthic foraminiferal faunas in a river-dominated shelf - faunal response to rapid changes of the river influence (Rhône prodelta, NW Mediterranean).
- Author
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Goineau, A., Fontanier, C., Jorissen, F., Buscail, R., Kerhervé, P., Cathalot, C., Pruski, A. M., Bourgeois, S., Metzger, E., Legrand, E., and Rabouille, C.
- Subjects
SPATIO-temporal variation ,FORAMINIFERA ,CARBON cycle ,SEDIMENTATION & deposition ,BENTHIC animals - Abstract
In the context of the French research project CHACCRA (Climate and Human-induced Alterations in Carbon Cycling at the River-seA connection), living (rose Bengal-stained) benthic foraminifera were investigated at two stations (24 and 67 m depth) in the Rhôone prodelta (NW Mediterranean, Gulf of Lions). The aim of this study was to precise the response of benthic foraminiferal faunas to temporal changes of the Rhône River inputs (e.g. organic and terrigeneous material). Each site was sampled in April 2007, September 2007, May 2008 and December 2008, permitting to observe foraminiferal faunas of the 63-150 and >150 µm size fractions under a wide range of environmental conditions. Obvious variations in foraminiferal faunal composition were observed during the four investigated periods at the shallowest Station A located in the close vicinity of the Rhône River mouth. Different colonisation stages were observed after major Rhône River flood events, foraminiferal faunas responding with an opportunistic strategy few days to weeks after the creation of a peculiar sedimentary environment (Leptohalysis scottii, May 2008) or high amounts of organic matter supplied by a river flood (Ammonia tepida, December 2008). Under more stable conditions, relatively diverse and equilibrated faunas grew in the sediments. Species benefited from noticeable input of riverine phytodetritus to the sediment during spring bloom conditions (April 2007; e.g. Bolivina dilatata, Nonionella stella, Stainforthia fusiformis), or high amounts of still bio-available organic matter under more oligotrophic conditions (September 2007; e.g. Ammonia tepida, Psammosphaera fusca). The reduced influence of the Rhône River input at the farther Station N led to less contrasted environmental conditions during the four sampling periods, and so to less obvious variations in foraminiferal faunal composition. During reduced riverine influence (i.e. low Rhône discharge), species able to feed on fresh phytodetritus (e.g. Clavulina cylindrica, Hopkinsina atlantica, Nonionella iridea and Nonionella turgida) benefited from eutrophic conditions of the spring bloom (April 2007, May 2008). Conversely, the occurrence of Nouria polymorphinoides under oligotrophic conditions (September 2007, December 2008) was indicative of a benthic environment potentially disturbed by bottom currents. This study put into evidence the extremely rapid response of benthic foraminiferal faunas to strong variations in environmental conditions, especially close to the river mouth (Station A), response noticeably reduced farther from the mouth (Station N) due to a weaker impact of riverine input. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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23. Improving precision and confidence of aquatic eddy correlation benthic solute exchange measurements – from flumes to the deep sea
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Daphne Donis, Dan McGinnis, Moritz Holtappels, Noss, C., Cathalot, C., Wenzhofer, F., Kasper Hancke, Lorke, A., Ronnie N. Glud, and Meysman, F.
- Subjects
Benthic ecology ,Eddy correlation ,oxygen
24. Ecology of Bathymodiolus puteoserpentis mussels from the Snake Pit vent field (Mid-Atlantic Ridge).
- Author
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Veuillot A, Pradillon F, Michel LN, Cathalot C, Cambon MA, and Sarrazin J
- Subjects
- Animals, Atlantic Ocean, Biodiversity, Bivalvia physiology, Ecology, Biomass, Environmental Monitoring, Mytilidae physiology, Hydrothermal Vents, Ecosystem
- Abstract
Along the northern Mid-Atlantic Ridge (nMAR), in habitats under moderate (<10 °C) hydrothermal influence on the Snake Pit vent field (SP), large assemblages dominated by Bathymodiolin mussels remain poorly characterised, contrary to those in warmer habitats dominated by gastropods and alvinocaridid shrimps that were recently described. In this study, we assessed and compared the population structure, biomass, diversity and trophic interactions of two Bathymodiolus puteoserpentis assemblages and their associated fauna at SP. Three sampling units distanced by 30 cm were sampled in 2014 during the BICOSE cruise at the top of the Moose site (''Elan'' site), while few meters further down three others, distanced by ∼1 m were obtained in 2018 during the BICOSE 2 cruise at the edifice's base. We observed a micro-scale heterogeneity between these six sampling units partially explained by temperature variations, proximity to hydrothermal fluids and position on the edifice. Meiofauna dominate or co-dominate most of the sampling units, with higher densities at the base of the edifice. In terms of macrofauna, high abundance of Pseudorimula midatlantica gastropods was observed at the top of the vent edifice, while numerous Ophioctenella acies ophiuroids were found at the base. Contrary to what was expected, the apparent health and abundance of mussels seems to indicate a current climax stage of the community. However, the modification of B. puteoserpentis isotopic signatures, low number of juveniles decreasing over the two years and observations made during several French cruises in the study area raise questions about the fate of the B. puteoserpentis population over time, which remains to be verified in a future sampling campaign., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024. Published by Elsevier Ltd.)
- Published
- 2024
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25. Fluid chemistry alters faunal trophodynamics but not composition on the deep-sea Capelinhos hydrothermal edifice (Lucky Strike vent field, Mid-Atlantic Ridge).
- Author
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Alfaro-Lucas JM, Martin D, Michel LN, Laes A, Cathalot C, Fuchs S, and Sarrazin J
- Subjects
- Animals, Chlorine, Cold Temperature, Contrast Media, Chlorides, Decapoda
- Abstract
The recently discovered deep-sea Capelinhos hydrothermal edifice, ~ 1.5 km of the main Lucky Strike (LS) vent field (northern Mid-Atlantic Ridge), contrasts with the other LS edifices in having poorly-altered end-member hydrothermal fluids with low pH and chlorine, and high metal concentrations. Capelinhos unique chemistry and location offer the opportunity to test the effects of local abiotic filters on faunal community structure while avoiding the often-correlated influence of dispersal limitation and depth. In this paper, we characterize for the first time the distribution patterns of the Capelinhos faunal communities, and analyze the benthic invertebrates (> 250 µm) inhabiting diffusive-flow areas and their trophic structures (δ
13 C, δ15 N and δ34 S). We hypothesized that faunal communities would differ from those of the nearest LS vent edifices, showing an impoverished species subset due to the potential toxicity of the chemical environment. Conversely, our results show that: (1) community distribution resembles that of other LS edifices, with assemblages visually dominated by shrimps (close to high-temperature focused-fluid areas) and mussels (at low-temperature diffuse flow areas); (2) most species from diffuse flow areas are well-known LS inhabitants, including the bed-forming and chemosymbiotic mussel Bathymodiolus azoricus and (3) communities are as diverse as those of the most diverse LS edifices. On the contrary, stable isotopes suggest different trophodynamics at Capelinhos. The high δ15 N and, especially, δ13 C and δ34 S values suggest an important role of methane oxidation (i.e., methanotrophy), rather than the sulfide oxidation (i.e., thiotrophy) that predominates at most LS edifices. Our results indicate that Capelinhos shows unique environmental conditions, trophic structure and trophodynamics, yet similar fauna, compared to other LS edifices, which suggest a great environmental and trophic plasticity of the vent faunal communities at the LS., (© 2024. The Author(s).)- Published
- 2024
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26. Hydrothermal plumes as hotspots for deep-ocean heterotrophic microbial biomass production.
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Cathalot C, Roussel EG, Perhirin A, Creff V, Donval JP, Guyader V, Roullet G, Gula J, Tamburini C, Garel M, Godfroy A, and Sarradin PM
- Subjects
- Carbon Cycle, Chemoautotrophic Growth physiology, Hydrothermal Vents chemistry, Microbiota, Models, Theoretical, Prokaryotic Cells metabolism, Seawater chemistry, Seawater microbiology, Biomass, Heterotrophic Processes physiology, Hydrothermal Vents microbiology, Oceans and Seas
- Abstract
Carbon budgets of hydrothermal plumes result from the balance between carbon sinks through plume chemoautotrophic processes and carbon release via microbial respiration. However, the lack of comprehensive analysis of the metabolic processes and biomass production rates hinders an accurate estimate of their contribution to the deep ocean carbon cycle. Here, we use a biogeochemical model to estimate the autotrophic and heterotrophic production rates of microbial communities in hydrothermal plumes and validate it with in situ data. We show how substrate limitation might prevent net chemolithoautotrophic production in hydrothermal plumes. Elevated prokaryotic heterotrophic production rates (up to 0.9 gCm
-2 y-1 ) compared to the surrounding seawater could lead to 0.05 GtCy-1 of C-biomass produced through chemoorganotrophy within hydrothermal plumes, similar to the Particulate Organic Carbon (POC) export fluxes reported in the deep ocean. We conclude that hydrothermal plumes must be accounted for as significant deep sources of POC in ocean carbon budgets., (© 2021. The Author(s).)- Published
- 2021
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27. A GC-SSIM-CRDS system: Coupling a gas chromatograph with a Cavity Ring-Down Spectrometer for onboard Twofold analysis of molecular and isotopic compositions of natural gases during ocean-going research expeditions.
- Author
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Brandily C, LeCuff N, Donval JP, Guyader V, De Prunele A, Cathalot C, Croguennec C, Caprais JC, and Ruffine L
- Subjects
- Carbon Isotopes analysis, Chromatography, Gas, Gases, Spectrum Analysis, Expeditions, Natural Gas
- Abstract
Carbon dioxide (CO
2 ) and methane (CH4 ) are two climate-sensitive components of gases migrating within sediments and emitted into the water column on continental margins. They are involved in several key biogeochemical processes entering into the global carbon cycle. In order to perform onboard measurements of both the molecular and stable carbon isotope ratios (δ13 C) of CH4 and CO2 of natural gases during oceanic cruises, we have developed a novel approach coupling gas chromatography (GC) with cavity ring-down spectroscopy (CRDS). The coupled devices are connected to a small sample isotope module (SSIM) to form a system called GC-SSIM-CRDS. Small volumes of natural gas samples (<1 mL) are injected into the GC using a headspace autosampler or a gas-tight syringe to separate the chemical components using a Shincarbon ST packed column and for molecular quantification by thermal conductivity detection (TCD). Subsequently, CO2 from the sample is trapped in a 7 mL loop at 32 °C before being transferred to the CRDS analyzer for sequential determination of the stable carbon isotope ratios of CH4 and CO2 in 24 min. The loop is an open column (without stationary phase). This approach does not require the use of adsorbents or cooling for the trapping step. Optimization of the separation step prior to analysis was focused on the influence of two key separation factors 1) the flow of the carrier gas and 2) the temperature of the oven. Our analytical system and the measurement protocol were validated on samples collected from gas seeps in the Sea of Marmara (Turkey). Our results show that the GC-SSIM-CRDS system provides a reliable determination of the molecular identification of CH4 and CO2 in complex natural gases, followed by the stable carbon isotope ratios of methane and carbon dioxide., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2021 Elsevier B.V. All rights reserved.)- Published
- 2021
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28. Persephonella atlantica sp. nov.: How to adapt to physico-chemical gradients in high temperature hydrothermal habitats.
- Author
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François DX, Godfroy A, Mathien C, Aubé J, Cathalot C, Lesongeur F, L'Haridon S, Philippon X, and Roussel EG
- Subjects
- Atlantic Ocean, Bacteria isolation & purification, Bacterial Typing Techniques, Base Composition, DNA, Bacterial genetics, Hot Temperature, RNA, Ribosomal, 16S genetics, Sequence Analysis, DNA, Bacteria classification, Hydrothermal Vents microbiology, Phylogeny
- Abstract
A novel thermophilic, microaerophilic and anaerobic, hydrogen- sulphur- and thiosulphate-oxidising bacterium, designated MO1340
T , was isolated from a deep-sea hydrothermal chimney collected from the Lucky Strike hydrothermal vent field on the Mid-Atlantic Ridge. Cells were short, motile rods of 1.4-2.2μm length and 0.5-0.8μm width. Optimal growth was observed for a NaCl concentration of 2.5 % (w/v) at pH 6.5. As for other members of the genus Persephonella, strain MO1340T was strictly chemolithoautotrophic and could oxidise hydrogen, elemental sulphur or thiosulphate using oxygen as electron acceptor. Anaerobic nitrate reduction using hydrogen could also be performed. Each catabolic reaction had a different optimal growth temperature (65 to 75°C) and an optimal dissolved oxygen concentration (11.4 to 119.7 μM at 70°C for aerobic reactions) that varied according to the electron donors utilised. These experimental results are consistent with the distribution of these catabolic substrates along the temperature gradient observed in active hydrothermal systems. They strongly suggest that this adaptive strategy could confer a selective advantage for strain MO1340T in the dynamic part of the ecosystem where hot, reduced hydrothermal fluid mixes with cold, oxygenated seawater. Phylogenetic analysis indicated that strain MO1340T was a member of the genus Persephonella within the order Hydrogenothermales as it shared a 16S rRNA gene sequence similarity <95.5 % and ANI respectively 75.66 % with closest described Persephonella (P. hydrogeniphila 29WT ). On the basis of the physiological and genomic properties of the new isolate, the name Persephonella atlantica sp. nov. is proposed. The type strain is MO1340T (=UBOCC-M-3359T =JCM 34026T )., (Copyright © 2021 Elsevier GmbH. All rights reserved.)- Published
- 2021
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29. Benthic Oxygen Uptake in the Arctic Ocean Margins - A Case Study at the Deep-Sea Observatory HAUSGARTEN (Fram Strait).
- Author
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Cathalot C, Rabouille C, Sauter E, Schewe I, and Soltwedel T
- Subjects
- Arctic Regions, Chlorophyll chemistry, Chlorophyll A, Diffusion, Ecosystem, Environmental Monitoring, Geography, Ice, Models, Statistical, Oceans and Seas, Bacteria metabolism, Biodiversity, Geologic Sediments microbiology, Oxygen chemistry, Water Microbiology
- Abstract
The past decades have seen remarkable changes in the Arctic, a hotspot for climate change. Nevertheless, impacts of such changes on the biogeochemical cycles and Arctic marine ecosystems are still largely unknown. During cruises to the deep-sea observatory HAUSGARTEN in July 2007 and 2008, we investigated the biogeochemical recycling of organic matter in Arctic margin sediments by performing shipboard measurements of oxygen profiles, bacterial activities and biogenic sediment compounds (pigment, protein, organic carbon, and phospholipid contents). Additional in situ oxygen profiles were performed at two sites. This study aims at characterizing benthic mineralization activity along local bathymetric and latitudinal transects. The spatial coverage of this study is unique since it focuses on the transition from shelf to Deep Ocean, and from close to the ice edge to more open waters. Biogeochemical recycling across the continental margin showed a classical bathymetric pattern with overall low fluxes except for the deepest station located in the Molloy Hole (5500 m), a seafloor depression acting as an organic matter depot center. A gradient in benthic mineralization rates arises along the latitudinal transect with clearly higher values at the southern stations (average diffusive oxygen uptake of 0.49 ± 0.18 mmol O2 m-2 d-1) compared to the northern sites (0.22 ± 0.09 mmol O2 m-2 d-1). The benthic mineralization activity at the HAUSGARTEN observatory thus increases southward and appears to reflect the amount of organic matter reaching the seafloor rather than its lability. Although organic matter content and potential bacterial activity clearly follow this gradient, sediment pigments and phospholipids exhibit no increase with latitude whereas satellite images of surface ocean chlorophyll a indicate local seasonal patterns of primary production. Our results suggest that predicted increases in primary production in the Arctic Ocean could induce a larger export of more refractory organic matter due to the longer production season and the extension of the ice-free zone.
- Published
- 2015
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30. Tiny is mighty: seagrass beds have a large role in the export of organic material in the tropical coastal zone.
- Author
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Gillis LG, Ziegler AD, van Oevelen D, Cathalot C, Herman PM, Wolters JW, and Bouma TJ
- Subjects
- Geologic Sediments, Thailand, Ecosystem, Oceans and Seas, Seawater, Wetlands
- Abstract
Ecosystems in the tropical coastal zone exchange particulate organic matter (POM) with adjacent systems, but differences in this function among ecosystems remain poorly quantified. Seagrass beds are often a relatively small section of this coastal zone, but have a potentially much larger ecological influence than suggested by their surface area. Using stable isotopes as tracers of oceanic, terrestrial, mangrove and seagrass sources, we investigated the origin of particulate organic matter in nine mangrove bays around the island of Phuket (Thailand). We used a linear mixing model based on bulk organic carbon, total nitrogen and δ13C and δ15N and found that oceanic sources dominated suspended particulate organic matter samples along the mangrove-seagrass-ocean gradient. Sediment trap samples showed contributions from four sources oceanic, mangrove forest/terrestrial and seagrass beds where oceanic had the strongest contribution and seagrass beds the smallest. Based on ecosystem area, however, the contribution of suspended particulate organic matter derived from seagrass beds was disproportionally high, relative to the entire area occupied by mangrove forests, the catchment area (terrestrial) and seagrass beds. The contribution from mangrove forests was approximately equal to their surface area, whereas terrestrial contributions to suspended organic matter under contributed compared to their relative catchment area. Interestingly, mangrove forest contribution at 0 m on the transects showed a positive relationship with the exposed frontal width of the mangrove, indicating that mangrove forest exposure to hydrodynamic energy may be a controlling factor in mangrove outwelling. However we found no relationship between seagrass bed contribution and any physical factors, which we measured. Our results indicate that although seagrass beds occupy a relatively small area of the coastal zone, their role in the export of organic matter is disproportional and should be considered in coastal management especially with respect to their importance as a nutrient source for other ecosystems and organisms.
- Published
- 2014
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