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3. Spatiotemporal dynamics of surface sediment characteristics and benthic macrofauna compositions in a temperate high-energy River-dominated Ocean Margin

Author

Lamarque, Bastien, Deflandre, Bruno, Schmidt, Sabine, Bernard, Guillaume, Dubosq, Nicolas, Diaz, Mélanie, Lavesque, Nicolas, Garabetian, Frédéric, Grasso, Florent, Sottolichio, Aldo, Rigaud, Sylvain, Romero-Ramirez, Alicia, Cordier, Marie-Ange, Poirier, Dominique, Danilo, Martin, and Grémare, Antoine

Published
2022
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12. Foraminifera: did the first canal systems develop in Involutinida?

Author

Rigaud, Sylvain, Consorti, Lorenzo, Granier, Bruno, and Schlagintweit, Felix

Subjects
*FORAMINIFERA, *ARAGONITE, *ONTOGENY
Abstract

Canal systems are advanced architectural features enabling the connection of various body regions via a network of passages. In Foraminifera, they enhance protoplasmic flow. Although they are principally observed in benthic representatives of the multilocular calcitic Order Rotaliida, canal systems presumably first appeared in a tubular, morphologically less complex foraminifer: the Bathonian-Cenomanian trochospiral genus Coscinoconus of the Order Involutinida. Based on the high-resolution analysis of a unique set of aragonitic Coscinoconus specimens, we here demonstrate that the porous system observed in the umbilical mass of these trochospiral Involutinida is a temporary feature. During ontogeny, it is at least partially plugged by aragonite directly secreted by the foraminifer, a process which limits its functional importance. A similar but open (unsealed) porous system is observed in another Involutinida genus, the planispiral Albian marker Hensonina, a controversial form that is here formally reinstated with Hensonina canalicula n. sp. as its type-species. The origin and development of these two porous systems are examined and compared with that of other foraminiferal groups, leading us to propose a clearer definition for wall pores and canal systems. Jurassic-Cretaceous Involutinida offer a fascinating example of a change in the role and function of wall pores through evolution. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Ideas and perspectives: The fluctuating nature of oxygen shapes the ecology of aquatic habitats and their biogeochemical cycles – the aquatic oxyscape

Author

Fusi, Marco, primary, Rigaud, Sylvain, additional, Guadagnin, Giovanna, additional, Barausse, Alberto, additional, Marasco, Ramona, additional, Daffonchio, Daniele, additional, Régis, Julie, additional, Huchet, Louison, additional, Camin, Capucine, additional, Pettit, Laura, additional, Vina-Herbon, Cristina, additional, and Giomi, Folco, additional

Published
2023
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14. The GEOTRACES Intermediate Data Product 2017

Author

Schlitzer, Reiner, Anderson, Robert F., Dodas, Elena Masferrer, Lohan, Maeve, Geibert, Walter, Tagliabue, Alessandro, Bowie, Andrew, Jeandel, Catherine, Maldonado, Maria T., Landing, William M., Cockwell, Donna, Abadie, Cyril, Abouchami, Wafa, Achterberg, Eric P., Agather, Alison, Aguliar-Islas, Ana, van Aken, Hendrik M., Andersen, Morten, Archer, Corey, Auro, Maureen, de Baar, Hein J., Baars, Oliver, Baker, Alex R., Bakker, Karel, Basak, Chandranath, Baskaran, Mark, Bates, Nicholas R., Bauch, Dorothea, van Beek, Pieter, Behrens, Melanie K., Black, Erin, Bluhm, Katrin, Bopp, Laurent, Bouman, Heather, Bowman, Katlin, Bown, Johann, Boyd, Philip, Boye, Marie, Boyle, Edward A., Branellec, Pierre, Bridgestock, Luke, Brissebrat, Guillaume, Browning, Thomas, Bruland, Kenneth W., Brumsack, Hans-Jürgen, Brzezinski, Mark, Buck, Clifton S., Buck, Kristen N., Buesseler, Ken, Bull, Abby, Butler, Edward, Cai, Pinghe, Mor, Patricia Cámara, Cardinal, Damien, Carlson, Craig, Carrasco, Gonzalo, Casacuberta, Núria, Casciotti, Karen L., Castrillejo, Maxi, Chamizo, Elena, Chance, Rosie, Charette, Matthew A., Chaves, Joaquin E., Cheng, Hai, Chever, Fanny, Christl, Marcus, Church, Thomas M., Closset, Ivia, Colman, Albert, Conway, Tim M., Cossa, Daniel, Croot, Peter, Cullen, Jay T., Cutter, Gregory A., Daniels, Chris, Dehairs, Frank, Deng, Feifei, Dieu, Huong Thi, Duggan, Brian, Dulaquais, Gabriel, Dumousseaud, Cynthia, Echegoyen-Sanz, Yolanda, Edwards, R. Lawrence, Ellwood, Michael, Fahrbach, Eberhard, Fitzsimmons, Jessica N., Russell Flegal, A., Fleisher, Martin Q., van de Flierdt, Tina, Frank, Martin, Friedrich, Jana, Fripiat, Francois, Fröllje, Henning, Galer, Stephen J.G., Gamo, Toshitaka, Ganeshram, Raja S., Garcia-Orellana, Jordi, Garcia-Solsona, Ester, Gault-Ringold, Melanie, George, Ejin, Gerringa, Loes J.A., Gilbert, Melissa, Godoy, Jose M., Goldstein, Steven L., Gonzalez, Santiago R., Grissom, Karen, Hammerschmidt, Chad, Hartman, Alison, Hassler, Christel S., Hathorne, Ed C., Hatta, Mariko, Hawco, Nicholas, Hayes, Christopher T., Heimbürger, Lars-Eric, Helgoe, Josh, Heller, Maija, Henderson, Gideon M., Henderson, Paul B., van Heuven, Steven, Ho, Peng, Horner, Tristan J., Hsieh, Yu-Te, Huang, Kuo-Fang, Humphreys, Matthew P., Isshiki, Kenji, Jacquot, Jeremy E., Janssen, David J., Jenkins, William J., John, Seth, Jones, Elizabeth M., Jones, Janice L., Kadko, David C., Kayser, Rick, Kenna, Timothy C., Khondoker, Roulin, Kim, Taejin, Kipp, Lauren, Klar, Jessica K., Klunder, Maarten, Kretschmer, Sven, Kumamoto, Yuichiro, Laan, Patrick, Labatut, Marie, Lacan, Francois, Lam, Phoebe J., Lambelet, Myriam, Lamborg, Carl H., Le Moigne, Frédéric A.C., Le Roy, Emilie, Lechtenfeld, Oliver J., Lee, Jong-Mi, Lherminier, Pascale, Little, Susan, López-Lora, Mercedes, Lu, Yanbin, Masque, Pere, Mawji, Edward, Mcclain, Charles R., Measures, Christopher, Mehic, Sanjin, Barraqueta, Jan-Lukas Menzel, van der Merwe, Pier, Middag, Rob, Mieruch, Sebastian, Milne, Angela, Minami, Tomoharu, Moffett, James W., Moncoiffe, Gwenaelle, Moore, Willard S., Morris, Paul J., Morton, Peter L., Nakaguchi, Yuzuru, Nakayama, Noriko, Niedermiller, John, Nishioka, Jun, Nishiuchi, Akira, Noble, Abigail, Obata, Hajime, Ober, Sven, Ohnemus, Daniel C., van Ooijen, Jan, O'Sullivan, Jeanette, Owens, Stephanie, Pahnke, Katharina, Paul, Maxence, Pavia, Frank, Pena, Leopoldo D., Peters, Brian, Planchon, Frederic, Planquette, Helene, Pradoux, Catherine, Puigcorbé, Viena, Quay, Paul, Queroue, Fabien, Radic, Amandine, Rauschenberg, S., Rehkämper, Mark, Rember, Robert, Remenyi, Tomas, Resing, Joseph A., Rickli, Joerg, Rigaud, Sylvain, Rijkenberg, Micha J.A., Rintoul, Stephen, Robinson, Laura F., Roca-Martí, Montserrat, Rodellas, Valenti, Roeske, Tobias, Rolison, John M., Rosenberg, Mark, Roshan, Saeed, Rutgers van der Loeff, Michiel M., Ryabenko, Evgenia, Saito, Mak A., Salt, Lesley A., Sanial, Virginie, Sarthou, Geraldine, Schallenberg, Christina, Schauer, Ursula, Scher, Howie, Schlosser, Christian, Schnetger, Bernhard, Scott, Peter, Sedwick, Peter N., Semiletov, Igor, Shelley, Rachel, Sherrell, Robert M., Shiller, Alan M., Sigman, Daniel M., Singh, Sunil Kumar, Slagter, Hans A., Slater, Emma, Smethie, William M., Snaith, Helen, Sohrin, Yoshiki, Sohst, Bettina, Sonke, Jeroen E., Speich, Sabrina, Steinfeldt, Reiner, Stewart, Gillian, Stichel, Torben, Stirling, Claudine H., Stutsman, Johnny, Swarr, Gretchen J., Swift, James H., Thomas, Alexander, Thorne, Kay, Till, Claire P., Till, Ralph, Townsend, Ashley T., Townsend, Emily, Tuerena, Robyn, Twining, Benjamin S., Vance, Derek, Velazquez, Sue, Venchiarutti, Celia, Villa-Alfageme, Maria, Vivancos, Sebastian M., Voelker, Antje H.L., Wake, Bronwyn, Warner, Mark J., Watson, Ros, van Weerlee, Evaline, Alexandra Weigand, M., Weinstein, Yishai, Weiss, Dominik, Wisotzki, Andreas, Woodward, E. Malcolm S., Wu, Jingfeng, Wu, Yingzhe, Wuttig, Kathrin, Wyatt, Neil, Xiang, Yang, Xie, Ruifang C., Xue, Zichen, Yoshikawa, Hisayuki, Zhang, Jing, Zhang, Pu, Zhao, Ye, Zheng, Linjie, Zheng, Xin-Yuan, Zieringer, Moritz, Zimmer, Louise A., Ziveri, Patrizia, Zunino, Patricia, and Zurbrick, Cheryl

Published
2018
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16. Supplementary material to "Ideas and perspectives. The fluctuating nature of oxygen shapes the ecology of aquatic habitats and their biogeochemical cycles: the aquatic oxyscape"

Author

Fusi, Marco, primary, Rigaud, Sylvain, additional, Guadagnini, Giovanna, additional, Barausse, Alberto, additional, Marasco, Ramona, additional, Daffonchio, Daniele, additional, Régis, Julie, additional, Huchet, Louison, additional, Camin, Capucine, additional, Pettit, Laura, additional, Vina-Herbon, Cristina, additional, and Giomi, Folco, additional

Published
2023
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17. Impact of anoxia and oyster mortality on nutrient and microbial planktonic components: A mesocosm study

Author

Le Ray, Julie, primary, Bec, Béatrice, additional, Fiandrino, Annie, additional, Lagarde, Franck, additional, Cimiterra, Nicolas, additional, Raimbault, Patrick, additional, Roques, Cécile, additional, Rigaud, Sylvain, additional, Régis, Julie, additional, Mostajir, Behzad, additional, Mas, Sébastien, additional, and Richard, Marion, additional

Published
2023
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18. Impact of an exceptional winter flood on benthic oxygen and nutrient fluxes in a temperate macrotidal estuary: Potential consequences on summer deoxygenation

Author

Hulot, Vivien, primary, Metzger, Edouard, additional, Thibault de Chanvalon, Aubin, additional, Mouret, Aurelia, additional, Schmidt, Sabine, additional, Deflandre, Bruno, additional, Rigaud, Sylvain, additional, Beneteau, Eric, additional, Savoye, Nicolas, additional, Souchu, Philippe, additional, Le Merrer, Yoann, additional, and Maillet, Grégoire M., additional

Published
2023
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19. Impact of an exceptional winter flood on benthic oxygen and nutrient fluxes in a temperate macrotidal estuary: Potential consequences on summer deoxygenation

Author

Hulot, Vivien, Metzger, Edouard, Thibault De Chanvalon, Aubin, Mouret, Aurelia, Schmidt, Sabine, Deflandre, Bruno, Rigaud, Sylvain, Beneteau, Eric, Savoye, Nicolas, Souchu, Philippe, Le Merrer, Yoann, Maillet, Grégoire M., Hulot, Vivien, Metzger, Edouard, Thibault De Chanvalon, Aubin, Mouret, Aurelia, Schmidt, Sabine, Deflandre, Bruno, Rigaud, Sylvain, Beneteau, Eric, Savoye, Nicolas, Souchu, Philippe, Le Merrer, Yoann, and Maillet, Grégoire M.

Abstract

Despite 20 years of control on eutrophication, episodes of summer hypoxia still occur in the Loire estuary, impacting water quality and posing a key scientific and management challenge. This work aimed to quantify the contribution of the benthic compartment to hypoxia in the Loire estuary by direct measurement of water–sediment fluxes and an in-depth understanding of the seasonal variations of oxides and phosphorus stocks. During the summer’s low-discharge period, results show that the iron oxide-rich deposit is stable under hypoxic conditions, limiting the release of dissolved phosphorus into the overlying water column. The high nitrate content of the water column appears to be an important oxidizer of iron during hypoxic periods, limiting dissolved phosphorus leakage and aggravation of hypoxia. During the exceptional winter flood, significant sediment erosion associated with bubbling phenomena (attributed to methane efflux) created severe fractures in the sediment and stimulated water–sediment exchange. During the following months, these fractures were progressively filled, which decreased the intensity of benthic fluxes. However, due to the high residence time in the water during the summer period, a simple model demonstrated that benthic contributions were sufficient to directly (by direct oxygen consumption) or indirectly (by promoting ammonia oxidation) affect the oxygen stock in the water column during the low-discharge period. Our study demonstrates the importance of the benthic compartment in the occurrence of hypoxia and the obvious lack of knowledge to illustrate and model the biogeochemical functioning of the estuary.

Published
2023
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27. First observations of seasonal bottom water deoxygenation off the Gironde estuary (Bay of Biscay, North East Atlantic)

Author

Dubosq, Nicolas, Schmidt, Sabine, Sudre, Joel, Rigaud, Sylvain, Lamarque, Bastien, Danilo, Martin, Grémare, Antoine, Deflandre, Bruno, Dubosq, Nicolas, Schmidt, Sabine, Sudre, Joel, Rigaud, Sylvain, Lamarque, Bastien, Danilo, Martin, Grémare, Antoine, and Deflandre, Bruno

Abstract

Although not systematically considered as oxygen minimum zones, River-dominated Ocean Margins are sensitive to oxygen depletions. For example, the continental shelf off the Gironde, which flows into the Bay of Biscay, had not yet been studied from this perspective although recent simulations suggested that this area should already have experienced deoxygenations in recent decades. To fill this gap, profiles of temperature, salinity and dissolved oxygen were performed in the water column of the continental shelf off the Gironde during seven cruises distributed over the different seasons between 2016 and 2021. Turbidity, chlorophyll-a and pH were also measured during some of these cruises. In winter, the water column was slightly stratified due to high river flows. Then, a seasonal thermal stratification was present from spring to autumn. Similarly, dissolved oxygen showed a seasonal dynamic with: a well-oxygenated water column in winter, an oxygen oversaturation in the first 20 meters during the spring bloom, and then a progressive oxygen depletion in bottom waters until reaching an oxygen saturation minimum down to 45% in autumn. These deoxygenations are explained by the seasonal stratification that isolates the bottom waters from spring to autumn, and are likely enhanced by the advection of deoxygenated waters from the north of the Bay of Biscay and the settling of the organic matter produced in surface waters. A better understanding of these processes in the context of global warming undoubtedly requires better documentation of dissolved oxygen variability through the implementation of a long-term and continuous in situ monitoring.

Published
2022
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30. Taanella yukonensis n. gen. n. sp., a uniquely perforate agglutinated foraminifer from the upper triassic of Panthalassa (Lime Peak, Yukon, Canada)

Author

Del Piero, Nicolo, Rigaud, Sylvain, and Martini, Rossana

Subjects
ddc:550
Abstract

This paper describes the new calc-cemented, agglutinated Panthalassan species Taanella yukonensis n. gen. n. sp. from the upper Norian of Lime Peak, Yukon, Canada. The species, morphologically close to a Triassic “trochamminid”, possesses unusually coarse wall perforations. This attribute is unknown from coeval agglutinated forms, which typically display imperforate or poorly perforate walls (i.e., loose agglutinated tests with gaps between particles). In the Late Triassic, remarkably large pores started to develop in a variety of foraminifers, including porcelaneous forms. This evolutionary tendency might indicate a heightened need to promote gas-exchange with the exterior. In T. yukonensis, this evolution is complemented with the development of externally globular chambers, separated by deep sutural slits, maximizing the surface ratio to the exterior.

Published
2022

34. Benthic oxygen dynamics and implication for the maintenance of chronic hypoxia and ecosystem degradation in the Berre lagoon (France)

Author

Rigaud, Sylvain, primary, Deflandre, Bruno, additional, Grenz, Christian, additional, Cesbron, Florian, additional, Pozzato, Lara, additional, Voltz, Baptiste, additional, Grémare, Antoine, additional, Romero-Ramirez, Alicia, additional, Mirleau, Pascal, additional, Meulé, Samuel, additional, Faure, Vincent, additional, Mayot, Nicolas, additional, Michotey, Valérie, additional, Bonin, Patricia, additional, Pascal, Ludovic, additional, Cordier, Marie-Ange, additional, Lamarque, Bastien, additional, Tenório, Márcio, additional, and Radakovitch, Olivier, additional

Published
2021
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38. SUSANE, a device for sampling chemical gradients in the benthic water column

Author

Knoery, Joel, Bastien, Thomas, Baltzer, Agnès, Cossa, Daniel, Donval, Jean-Pierre, RIGAUD, Sylvain, Biogéochimie et Ecotoxicologie (IFREMER BE), Institut Français de Recherche pour l'Exploitation de la Mer - Atlantique (IFREMER Atlantique), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Littoral, Environnement, Télédétection, Géomatique UMR 6554 (LETG), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Université d'Angers (UA)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Brest (UBO)-Université de Rennes 2 (UR2), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN), Université de Nantes (UN)-Université de Nantes (UN), Détection, évaluation, gestion des risques CHROniques et éMErgents (CHROME) / Université de Nîmes (CHROME), Université de Nîmes (UNIMES), and baltzer, Agnès

Subjects
[SDE] Environmental Sciences, [SDE]Environmental Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2020

46. Susane , a device for sampling chemical gradients in the benthic water column

Author

Knoery, Joel, Cossa, Daniel, Thomas, Bastien, Germain, Gregory, Rigaud, Sylvain, Knoery, Joel, Cossa, Daniel, Thomas, Bastien, Germain, Gregory, and Rigaud, Sylvain

Abstract

In aquatic environments, the benthic water column exhibits strong concentration gradients of various substances. They result from transfers and chemical reactions that may occur both within this layer, and at the sediment–water interface (SWI). Characterization of these gradients yields important information for the quantification of such processes and transfers. However, it is difficult to actually sample these gradients in the field, since turbulence decreases their vertical scale. This article describes a sampler designed to collect simultaneously 16 discrete water column samples at a centimeter‐scale vertical resolution. This small device (40 × 40 × 60 cm) is reliable, safe to handle, and easily deployed from a small boat using a cable or a Scuba diver. It is made of materials compatible with trace element and dissolved gases work, and simultaneously draws samples from various heights above the SWI into 60 mL syringes. The altitude of the sample inlets is field‐adjustable. Sampling artifacts are minimized by in situ flushing of tubing dead volumes, by rapid and simultaneous sample collection, and by sampling an undisturbed water‐column. Thus, this device can contribute to the characterization of vertical concentration gradients in benthic water‐columns. Such gradients of various compounds and metals from two coastal sites (Quiberon Bay and Berre Lagoon) are shown, illustrating the sampler's usefulness to describe and investigate processes in the benthic zone.

Published
2019
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47. New biostratigraphic constraints for the Martin Bridge Formation (Upper Triassic, Wallowa terrane, Oregon, U.S.A.)

Author

Khalil, Hany, McRoberts, Christopher, Del Piero, Nicolo, Stanley Jr., George, Martini, Rossana, and Rigaud, Sylvain

Subjects
Wallowa terrane, Oregon, ddc:550, Martin Bridge Formation, Upper Triassic, Halobia
Abstract

The stratigraphic relationships between the thick carbonate deposits of the Martin Bridge Formation and contiguous clastic lithologies are poorly understood. Biostratigraphic markers are almost absent in the shallow-water Triassic limestones and, in places where deeper, fossiliferous-rich carbonate rocks occur, incomplete exposures, metamorphism and structural complexity have obscured most stratigraphic contacts. We have investigated two deep-water localities in the eastern and southern Wallowa Mountains, in which transitional contacts are preserved. There, rich assemblages of Halobia bivalves have been found, including H. ornatissima, H. radiata or H. septentrionalis, and Halobia spp. aff. H. beyrichi. The short temporal range of these taxa designate a precise timing constraints of lithological transitions, at the base and at the top of the Martin Bridge Formation.

Published
2018

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