HERNVANN Pierre-Yves
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pierre-yves.hernvann@institut-agro.fr Tel : +33 2 23 48 55 33 Scientist |
Activities
Current Position
Scientist, Ecology and Ecosystem Health research unit (ESE), Fisheries and Aquatic Ecology Research Team, Agrocampus Ouest, Rennes (Brittany)Research
Thesis
Modelling of the trophic functionning of the Celtic Sea ecosystem: impact of fisheries and ecosystem-based management scenarios.Current Research Topics
Team of supervising: Didier GASCUEL (UMR ESE, Agrocampus Ouest, Rennes), Marianne ROBERT and Dorothée KOPP (LTBH, Ifremer Lorient.My current researches aim to analyze and quantify the impact of fishing on the Celtic Sea ecosystem, which is a crucial area for European, especially French, fishing fleets. Trophic approach allows to understand how this impact, through predation (thus, through the food-web) and competition, spreads from the target species to the whole ecosystem.
My project is mainly based on trophic modelling with the widely recognized Ecopath with Ecosim software and will involve the 3 following steps:
Developing a generic method to estimate diet matrices in Ecopath models
Different kind of data such as stable isotopes analysis or stomach contents analysis will be coupled through a Bayesian network that will also take uncertainty of the estimations into account. Then, this method will be applied to data from the EATME program (IFREMER Lorient) to improve our knowledge of trophic functioning of the Celtic Sea.
Spatializing the model using Ecospace
Habitat models for the main target species will be the cornerstone of the spatialization step. Adjusting the Ecospace model on spatialized time-series of catch, fishing effort (OBSMER program – Fisheries and aquaculture Directorate / IFREMER) and abundance (EVHOE survey – IFREMER) will allow studying spatio-temporal changes in abundance of resources from 1980 and their fisheries and environmental determinants.
Using the Celtic Sea model in a predictive way
I will test several management scenarios to identify key strategies to support an effective ecosystem approach of fishing management in Europe
Potential collaborations
IFREMER - Fisheries technology and biology laboratory (LBTH), LorientICES Working Group on “Multispecies Assessment Methods” (WGSAM)
Discardless - European Project H2020
Selected recent publications
Hinchliffe Charles, Kuriyama Peter T, Punt André E, Field John C, Thompson Andrew R, Santora Jarrod A, Muhling Barbara A, Koenigstein Stefan, Hernvann Pierre-Yves, Tommasi Desiree (2025). Long-term population trend of northern anchovy (Engraulis mordax) in the California Current system. ICES Journal of Marine Science, 2025, 82 (1), fsae177 (17p.). ⟨10.1093/icesjms/fsae177⟩
Liu Owen R., Kaplan Isaac C., Hernvann Pierre-Yves, Fulton Elizabeth A., Haltuch Melissa A., Harvey Chris J., Marshall Kristin N., Muhling Barbara, Norman Karma, Pozo Buil Mercedes, Rovellini Alberto, Samhouri Jameal F. (2025). Climate Change Influences via Species Distribution Shifts and Century‐Scale Warming in an End‐To‐End California Current Ecosystem Model. Global Change Biology, 2025, 31 (1), pp.e70021 (15 ). ⟨10.1111/gcb.70021⟩
Bastardie François, Astarloa Amaia, Binch Logan, Bitetto Isabella, Damalas Dimitrios, Depestele Jochen, Hernvann Pierre-Yves, Lehuta Sigrid, Letschert Jonas, Maina Irida, Mahévas Stephanie, Papantoniou Georgia, Püts Miriam, Romagnoni Giovanni, Spedicato Maria Teresa, Sys Klaas, Tsikopoulou Irini, van Hoey Gert, Zupa Walter, Rindorf Anna (2025). Anticipating how spatial fishing restrictions in EU waters perform to protect marine species, habitats, and dependent fisheries. Frontiers in Marine Science, 2025, 12, 1629180 (22 p.). ⟨10.3389/fmars.2025.1629180⟩
Quezada-Escalona Felipe J., Tommasi Desiree, Kaplan Isaac C., Hernvann Pierre-Yves, Frawley Timothy H., Garcia Dorleta, Ibaibarriaga Leire, Sánchez-Maroño Sonia, de Moor Carryn, Beckensteiner Jennifer, Schueller Amy M., Feijó Diana, Ciorciaro Domenico, Kurota Hiroyuki, Oliveros-Ramos Ricardo, Wildermuth Robert P., Mroch Ray, Wise Laura, Baker Matthew R., Hansen Cecilie, Hemed Sidi Ahmed, Brochier Timothée, Stohs Stephen M., Enciso-Enciso Concepcion, Jacobsen Nis S. (2025). Socio-economic impacts and responses of the fishing industry and fishery managers to changes in small pelagic fish distribution and abundance. Reviews in Fish Biology and Fisheries, 2025, 35 (2), pp.1063-1093. ⟨10.1007/s11160-025-09949-4⟩
Rivot Etienne, Olmos Maxime, Lemaire-Patin Remi, Hernvann Pierre‐yves, Nevoux Marie, Prévost Etienne, Buoro Mathieu, Beaulaton Laurent (2025). SalmoGlob – Un nouveau modèle pour l’évaluation des stocks de saumon atlantique à l’échelle de l’Atlantique Nord. Sciences Eaux & Territoires, 2025, 47, pp.9154. ⟨10.20870/revue-set.2025.47.9154⟩
Rovellini Alberto, Punt André, Bryan Meaghan, Kaplan Isaac, Dorn Martin, Aydin Kerim, Fulton Elizabeth, Alglave Baptiste, Baker Matthew, Carroll Gemma, Ferriss Bridget, Haltuch Melissa, Hayes Adam, Hermann Albert, Hernvann Pierre-Yves, Holsman Kirstin, Liu Owen, Mchuron Elizabeth, Morzaria-Luna Hem, Moss Jamal, Surma Szymon, Weise Madison (2024). Linking climate stressors to ecological processes in ecosystem models, with a case study from the Gulf of Alaska. ICES Journal of Marine Science, 2024, pp.1-13. ⟨10.1093/icesjms/fsae002⟩
Liu Owen, Ward Eric, Anderson Sean, Andrews Kelly, Barnett Lewis A. K., Brodie Stephanie, Carroll Gemma, Fiechter Jerome, Haltuch Melissa, Harvey Chris, Hazen Elliott, Hernvann Pierre-Yves, Jacox Michael, Kaplan Isaac, Matson Sean, Norman Karma, Pozo Buil Mercedes, Selden Rebecca, Shelton Andrew, Samhouri Jameal (2023). Species redistribution creates unequal outcomes for multispecies fisheries under projected climate change. Science Advances , 2023, 9 (33), ⟨10.1126/sciadv.adg5468⟩
Olmos Maxime, Lemaire-Patin Remi, Hernvann Pierre‐yves, Ounsley James, Queroue Maud, Bolstad Geir, Fiske Peder, Chaput Gérald, Prévost Etienne, Nevoux Marie, Dauphin Guillaume, Rivot Etienne (2023). Benchmarking the north atlantic salmon stock assessment: a new life cycle model to evaluate salmon mixed stock status and fisheries management scenarios across the north atlantic basin. 2023
Drouineau Hilaire, Moullec Fabien, Gascuel Didier, Laloë Francis, Lucas Sterenn, Bez Nicolas, Guillotreau Patrice, Guitton Jérôme, Hernvann Pierre-Yves, Huret Martin, Lehuta Sigrid, Léopold Marc, Mahévas Stéphanie, Robert Marianne, Woillez Mathieu, Vermard Youen (2023). Food for thought from French scientists for a revised EU Common Fisheries Policy to protect marine ecosystems and enhance fisheries performance. Marine Policy, 2023, 148, pp.105460. ⟨10.1016/j.marpol.2022.105460⟩
Diack Graeme, Bull Colin, Akenhead Scott, van der Stap Tim, Johnson Brett C., Rivot Etienne, Patin Rémi, Hernvann Pierre‐Yves, Schubert Aidan, Bird Tom, Saunders Mark, Crozier Walter (2022). Enhancing data mobilisation through a centralised data repository for Atlantic salmon (Salmo salar L.): Providing the resources to promote an ecosystem-based management framework.. Ecological Informatics, Elsevier, 2022, 70, ⟨10.1016/j.ecoinf.2022.101746⟩