Gauthier SCHAAL

Marine biology and ecology, trophic ecology, stable isotopes, fatty acids

Senior Lecturer
Université de Bretagne Occidentale

Assignment

LEMAR Laboratory

Discovery

Contact

Gauthier.Schaal@univ-brest.fr

+33 2 98 49 86 90

Links

Ma page researchgate

Mon fil twitter

I have been a teacher-researcher at the University of Western Brittany since 2012, after a PhD at the Roscoff Biological Station (Sorbonne Universities), and a post-doctorate in South Africa, at Rhodes University (Grahamstown).

My research activity focuses on the understanding of trophic interactions within ecosystems, from benthic primary consumers to large pelagic predators. I use different approaches, in particular those based on trophic biomarkers such as stable isotopes (C, N, S, Hg), lipids (fatty acids, sterols) or metallic trace elements. My activity also leads me to be interested in other aspects of ecosystem functioning, such as the structure and composition of communities, in connection with a strong personal interest in the taxonomy of benthic invertebrates.

My main geographical areas of interest are the coastal environments of Western Europe, Mediterranean lagoons, the Pacific coast of Mexico (Baja California), Gabon and Mayotte.

I am currently co-supervising the theses of:

Anthony Voisin: Biodiversity under rapid environmental changes: food web structure, trophic interactions, and commmunity response in benthic Antarctic ecosystems
Rémi Brosse: Factors influencing the distribution of the gastropod Terebralia palustris in the magroves of Mayotte
Alice Guillot: The diversity of nutritional and toxicological profiles in Western and Central African marine resources
Johann Ludovic Happi: Mangrove-associated benthic macrofauna in Gabon: impact of human activities and the development of pollution indicators
Youri Ivann Mvomo Minko: The functional role of gabonese coastal waters for two shark species: Sphyrna lewini and Carcharhinus limbatus

Peer-reviewed publications (aka ACL in French) since 2010

355235 ACL schaal 1 apa 50 default desc 1 Schaal, G. 199792 https://www-iuem.univ-brest.fr/lemar/wp-content/plugins/zotpress/

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Sturbois, A., Cormy, G., Schaal, G., Gauthier, O., Ponsero, A., Le Mao, P., Riera, P., & Desroy, N. (2021). Characterizing spatio-temporal changes in benthic communities: Taxonomic and functional trajectories of intertidal assemblages in the bay of Saint-Brieuc (English Channel). Estuarine Coastal and Shelf Science, 262, 107603. https://doi.org/10.1016/j.ecss.2021.107603 Cite

Masia, P., Mateo, J. L., Arias, A., Bartolome, M., Blanco, C., Erzini, K., Le Loc’h, F., Mve Beh, J. H., Power, D., Rodriguez, N., Schaal, G., Machado-Schiaffino, G., & Garcia-Vazquez, E. (2022). Potential microplastics impacts on African fishing resources. Science of the Total Environment, 806, 150671. https://doi.org/10.1016/j.scitotenv.2021.150671 Cite

Sturbois, A., Cormy, G., Le Moal, A., Schaal, G., Broudin, C., Thiebaut, E., Ponsero, A., Le Mao, P., Jones, A., Riera, P., Gauthier, O., & Desroy, N. (2021). Using ecological trajectories to track long-term taxonomic and functional changes in benthic shallow soft-bottom communities (Bay of Saint-Brieuc, English Channel). Aquatic Conservation-Marine and Freshwater Ecosystems. https://doi.org/10.1002/aqc.3704 Cite

Besnard, L., Le Croizier, G., Galvan-Magana, F., Point, D., Kraffe, E., Ketchum, J., Martinez Rincon, R. O., & Schaal, G. (2021). Foraging depth depicts resource partitioning and contamination level in a pelagic shark assemblage: Insights from mercury stable isotopes. Environmental Pollution, 283, 117066. https://doi.org/10.1016/j.envpol.2021.117066 Cite

Burel, T., Grall, J., Schaal, G., Le Duff, M., & Ar Gall, E. (2020). Wave height vs. elevation effect on macroalgal dominated shores: an intercommunity study. Journal of Applied Phycology, 32(4), 2523–2534. https://doi.org/10.1007/s10811-019-01989-1 Cite

Mathieu-Resuge, M., Le Grand, F., Schaal, G., Lluch-Cota, S. E., Racotta, I. S., & Kraffe, E. (2020). Specific regulations of gill membrane fatty acids in response to environmental variability reveal fitness differences between two suspension-feeding bivalves (Nodipecten subnodosus and Spondylus crassisquama). Conservation Physiology, 8, coaa079. https://archimer.ifremer.fr/doc/00648/75991/. https://doi.org/10.1093/conphys/coaa079 Cite

Le Croizier, G., Lorrain, A., Schaal, G., Ketchum, J., Hoyos-Padilla, M., Besnard, L., Munaron, J.-M., Le Loc’h, F., & Point, D. (2020). Trophic resources and mercury exposure of two silvertip shark populations in the Northeast Pacific Ocean. Chemosphere, 253, 126645. https://doi.org/10.1016/j.chemosphere.2020.126645 Cite

Le Croizier, G., Lorrain, A., Sonke, J. E., Jaquemet, S., Schaal, G., Renedo, M., Besnard, L., Cherel, Y., & Point, D. (2020). Mercury isotopes as tracers of ecology and metabolism in two sympatric shark species. Environmental Pollution, 265(PT B), 114931. https://doi.org/10.1016/j.envpol.2020.114931 Cite

Jones, A. G., Quillien, N., Fabvre, A., Grall, J., Schaal, G., & Le Bris, H. (2020). Green macroalgae blooms (Ulva spp.) influence trophic ecology of juvenile flatfish differently in sandy beach nurseries. Marine Environmental Research, 154, UNSP 104843. https://doi.org/10.1016/j.marenvres.2019.104843 Cite

Mathieu-Resuge, M., Le Grand, F., Schaal, G., Kraffe, E., Lorrain, A., Letourneur, Y., Lemonnier, H., Benoit, J., & Hochard, S. (2020). Assimilation of shrimp farm sediment by Holothuria scabra: a coupled fatty acid and stable isotope approach. Aquatic Living Resources, 33, 3. https://archimer.ifremer.fr/doc/00624/73589/. https://doi.org/10.1051/alr/2020004 Cite

Le Croizier, G., Lorrain, A., Sonke, J. E., Hoyos-Padilla, E. M., Galvan-Magana, F., Santana-Morales, O., Aquino-Baleyto, M., Becerril-Garcia, E. E., Muntaner-Lopez, G., Ketchum, J., Block, B., Carlisle, A., Jorgensen, S. J., Besnard, L., Jung, A., Schaal, G., & Point, D. (2020). The Twilight Zone as a Major Foraging Habitat and Mercury Source for the Great White Shark. Environmental Science & Technology, 54(24), 15872–15882. https://doi.org/10.1021/acs.est.0c05621 Cite

Sturbois, A., De Caceres, M., Sanchez-Pinillos, M., Schaal, G., Gauthier, O., Le Mao, P., Ponsero, A., & Desroy, N. (2021). Extending community trajectory analysis: New metrics and representation. Ecological Modelling, 440, 109400. https://doi.org/10.1016/j.ecolmodel.2020.109400 Cite

Le Croizier, G., Schaal, G., Point, D., Le Loc’h, F., Machu, E., Fall, M., Munaron, J.-M., Boye, A., Walter, P., Lae, R., & Tito-de-Morais, L. (2019). Stable isotope analyses revealed the influence of foraging habitat on mercury accumulation in tropical coastal marine fish. Science of the Total Environment, 650, 2129–2140. fdi:010074333 ; https://archimer.ifremer.fr/doc/00458/57013/. https://doi.org/10.1016/j.scitotenv.2018.09.330 Cite

Mathieu-Resuge, M., Kraffe, E., Le Grand, F., Boens, A., Bideau, A., Lluch-Cota, S. E., Racotta, I. S., & Schaal, G. (2019). Trophic ecology of suspension-feeding bivalves inhabiting a north-eastern Pacific coastal lagoon: Comparison of different biomarkers. Marine Environmental Research, 145, 155–163. https://archimer.ifremer.fr/doc/00484/59521/. https://doi.org/10.1016/j.marenvres.2019.02.016 Cite

Mathieu-Resuge, M., Schaal, G., Kraffe, E., Corvaisier, R., Lebeau, O., Lluch-Cota, S. E., Salgado Garcia, R. L., Kainz, M. J., & Le Grand, F. (2019). Different particle sources in a bivalve species of a coastal lagoon: evidence from stable isotopes, fatty acids, and compound-specific stable isotopes. Marine Biology, 166(7), 89. https://archimer.ifremer.fr/doc/00501/61306/. https://doi.org/10.1007/s00227-019-3535-z Cite

Lelievre, Y., Sarrazin, J., Marticorena, J., Schaal, G., Day, T., Legendre, P., Hourdez, S., & Matabos, M. (2018). Biodiversity and trophic ecology of hydrothermal vent fauna associated with tubeworm assemblages on the Juan de Fuca Ridge. Biogeosciences, 15(9), 2629–2647. https://archimer.ifremer.fr/doc/00439/55083/. https://doi.org/10.5194/bg-15-2629-2018 Cite

Liénart, C., Savoye, N., Bozec, Y., Breton, E., Conan, P., David, V., Feunteun, E., Grangeré, K., Kerhervé, P., Lebreton, B., Lefebvre, S., L’Helguen, S., Mousseau, L., Raimbault, P., Richard, P., Riera, P., Sauriau, P.-G., Schaal, G., Aubert, F., … Sultan, E. (2017). Dynamics of particulate organic matter composition in coastal systems: A spatio-temporal study at multi-systems scale. Progress in Oceanography, 156, 221–239. https://archimer.ifremer.fr/doc/00374/48550/. https://doi.org/10.1016/j.pocean.2017.03.001 Cite

Gasmi, S., Bernard, I., Pouvreau, S., Maurer, D., Schaal, G., Ganthy, F., Cominassi, L., Allain, G., Sautour, B., & David, V. (2017). Spatial patterns in the condition index of the wild Pacific oyster Crassostrea gigas in a macrotidal coastal ecosystem: Influence of tidal processes and beyond. Journal of Sea Research, 119, 28–36. http://www.sciencedirect.com/science/article/pii/S1385110116300314. https://doi.org/10.1016/j.seares2016.10.008 Cite

Quillien, N., Nordstrom, M. C., Schaal, G., Bonsdorff, E., & Grall, J. (2016). Opportunistic basal resource simplifies food web structure and functioning of a highly dynamic marine environment. Journal of Experimental Marine Biology and Ecology, 477, 92–102. https://doi.org/10.1016/j.jembe.2016.01.010 Cite

Schaal, G., Nerot, C., Grall, J., Chouvelon, T., Lorrain, A., Mortillaro, J.-M., Savoye, N., Brind’Amour, A., Paulet, Y.-M., & Le Bris, H. (2016). Stable isotope ratios in bentho-demersal biota along a depth gradient in the Bay of Biscay: A multitrophic study. Estuarine Coastal and Shelf Science, 179, 201–206. fdi:010068095. https://doi.org/10.1016/j.ecss.2015.10.023 Cite

Schaal, G., Leclerc, J.-C., Droual, G., Leroux, C., & Riera, P. (2016). Biodiversity and trophic structure of invertebrate assemblages associated with understorey red algae in a Laminaria digitata bed. Marine Biology Research, 12(5), 513–523. https://doi.org/10.1080/17451000.2016.1164318 Cite

Le Croizier, G., Schaal, G., Gallon, R., Fall, M., Le Grand, F., Munaron, J.-M., Rouget, M.-L., Machu, E., Le Loc’h, F., Laë, R., & Tito-de-Morais, L. (2016). Trophic ecology influence on metal bioaccumulation in marine fish: Inference from stable isotope and fatty acid analyses. Science of the Total Environment, 573, 83–95. fdi:010068793. https://doi.org/http://dx.doi.org/10.1016/j.scitotenv.2016.08.035 Cite

Chouvelon, T., Schaal, G., Grall, J., Pernet, F., Perdriau, M., A-Pernet, E. J., & Le Bris, H. (2015). Isotope and fatty acid trends along continental shelf depth gradients: Inshore versus offshore hydrological influences on benthic trophic functioning. Progress in Oceanography, 138, 158–175. https://doi.org/10.1016/j.pocean.2015.07.013 Cite

Nerot, C., Meziane, T., Schaal, G., Grall, J., Lorrain, A., Paulet, Y.-M., & Kraffe, E. (2015). Spatial changes in fatty acids signatures of the great scallop Pecten maximus across the Bay of Biscay continental shelf. Continental Shelf Research, 109, 1–9. fdi:010065445. https://doi.org/10.1016/j.csr.2015.08.032 Cite

Schaal, G., & Grall, J. (2015). Microscale aspects in the diet of the limpet Patella vulgata L. Journal of the Marine Biological Association of the United Kingdom, 95(6), 1155–1162. https://doi.org/10.1017/S0025315415000429 Cite

Mortillaro, J. M., Schaal, G., Grall, J., Nerot, C., Brind’Amour, A., Marchais, V., Perdriau, M., & Le Bris, H. (2014). Comparative study of isotopic trends in two coastal ecosystems of North Biscay: A multitrophic spatial gradient approach. Estuarine, Coastal and Shelf Science, 136, 149–156. https://archimer.ifremer.fr/doc/00167/27847/. https://doi.org/10.1016/j.ecss.2013.11.025 Cite

Leclerc, J.-C., Riera, P., Leroux, C., Lévêque, L., Laurans, M., Schaal, G., & Davoult, D. (2013). Trophic significance of kelps in kelp communities in Brittany (France) inferred from isotopic comparisons. Marine Biology, 160(12), 3249–3258. http://link.springer.com/article/10.1007/s00227-013-2306-5 Cite

Marchais, V., Schaal, G., Grall, J., Lorrain, A., Nerot, C., Richard, P., & Chauvaud, L. (2013). Spatial variability of stable isotope ratios in oysters (Crassostrea gigas) and primary producers along an estuarine gradient (Bay of Brest, France). Estuaries and Coasts, 36(4), 808–819. http://link.springer.com/article/10.1007/s12237-012-9584-x Cite

Schaal, G., Riera, P., & Leroux, C. (2012). Food web structure within kelp holdfasts (Laminaria): a stable isotope study. Marine Ecology, 33(3), 370–376. http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0485.2011.00487.x/full Cite

Schaal, G., Riera, P., Leroux, C., & Grall, J. (2010). A seasonal stable isotope survey of the food web associated to a peri-urban rocky shore. Marine Biology, 157(2), 283–294. http://link.springer.com/article/10.1007/s00227-009-1316-9 Cite