Delphine NICOLAS – Tour du Valat

Themes: Species Conservation | Management and restoration of Natural and Agricultural ecosystems

Contact: e-mail | Ph. +33 (0)4 90 97 29 80

Joined our team: December 2015

Research interests and expertise

My research aims to improve our understanding of:

The spatial and temporal distribution of fish species, based on macro-ecological approaches (long spatial and/or temporal series);
Population dynamics through a long-term capture-mark-recapture monitoring programme.

My work aims to improve the conservation and management of endemic species in the Mediterranean Basin in times of global change.

I am currently focusing on two threatened species in two different study areas: the European Eel in the Camargue and the Marble Trout at the head of the Soča basin in Slovenia. I am particularly interested in the impact of extreme events (floods, droughts, and landslides), as well as in the arrival of introduced species, such as Wels Catfish and Topmouth Gudgeon in the Camargue, and Brown Trout and Rainbow Trout in Slovenia.

Projects

In the Camargue, from freshwater canals to salt marshes:

1993 – present: Long-term monthly monitoring of fish populations and fish cancer in the Fumemorte Canal (see project).
1993 – present: Monitoring of the different phases of the European Eel at La Capelière in the Vaccarès Lagoon.
2001 – present: Capture-mark-recapture monitoring of the European Eel in the Fumemorte Canal (see project).
2016 – 2021: Monitoring of the hydrobiological connectivity in the ponds and marshes on the former Camargue saltworks site. Monitoring of the recruitment of species coming from the sea (glass eel phase for the European Eel, migratory marine fish species such as sole, bass, and bream, and decapod crustaceans such as green crab and grey shrimp). Monitoring of the downstream migration of European Eel (see project).
2019 – present: Telemetric monitoring by radio identification (RFID) set up in the Fumemorte basin to study the longitudinal movements of European Eels in the yellow stage between the Vaccarès Lagoon and the Fumemorte Canal, as well as the dynamics of downstream migration during the silver stage.
– 2020-2021: Meta-analysis of glass eel recruitment throughout the Camargue delta.

In Slovenia, at the head of the Soča basin:

1993 – present: Marble Trout project conducted in collaboration with the Tolmin fishing association in Slovenia. Monitoring the population dynamics of genetically pure marble trout, and naturalised allopatric or sympatric populations of brown trout and rainbow trout (see project).

Scientific collaborations

2019 – 2020: Development of a fish indicator in lagoons adapted to the French context, INPOLAG Project (Indicateur Poisson Lagune). With Ifremer, UMR MARBEC / University of Montpellier, CEFREM / University of Perpignan.
2019 -2020: Use of the Three-spined stickleback to study the effects of a cocktail of pesticides produced by rice cultivation in the Camargue, under variable salinity conditions: influence of rapid selection mechanisms on the ecotoxicological response. With the UMR MARBEC / University of Montpellier, the UMR SEBIO / INERIS and the Camargue National Nature Reserve.
2018 – 2019: Participation in the ROSETTA project, setting up a monitoring network for the Rosette agent, a pathogen carried by the Stone moroko (Pseudorasbora parva) that can have an impact on other teleost species. With AFB, IRD, FNPF.

Postdoctoral fellow, Ph. D student and non-permanent staff supervision

Hoste, Amélie, 2021-2024. Growth of European eel in Mediterranean lagoons: inter-habitat comparison of demography, migration dynamics and condition of future spawners. Ph. D. ED 251. Ph. D. supervisors : Jean-Christophe Poggiale, Université de Marseille CNRS M.I.O. (UMR 7294 – UM 110) professor. Co-supervisor : D. Nicolas, Tour du Valat.
Testi, Baptiste. 02-04/2022. Analyses of temperature records from 25 sites in the upper Soca River basin in Slovenia. Research engineer (non-permanent).
Bouchard, Colin. 2020-2021. Meta-analysis of glass eel recruitment : Synthesis and analysis of the ecological continuity
throughout the Camargue delta. Postdoctorate. Co-supervision : Olivier Boutron, Hilaire Drouineau, and Patrick Lambert of INRAE Bordeaux

Supervision of students (internship)

Vey Payre, Hugo. 2022. Comparison of the European eel’s growth between different lagoon habitats by otolithometry. Master 2 internship, Ecology/ethology, University Jean Monnet (St Etienne). Co-supervisors : D. Nicolas, E. Amilhat & E. Faliex (CEFREM/Université de Perpignant) & C. Tétrel (OFB)
Mollier, Esther. 2021. Characterisation of the dynamics of downstream migrations of the European Eel in a Camargue drainage canal. End of studies internship (Master 2), Institut National Supérieur des Sciences Agronomiques, de l’Alimentation et de l’Environnement de Dijon (Higher National Institute of Agricultural Science, Food and Environment). Co-supervision : D. Nicolas & C. Bouchard
Giraud, Jules. 2020 Evaluation of the detection efficiency of an RFID telemetry device. 3-month M1 internship as part of a tutored gap year at the SupAgro Institure of Montpellier. Co-supervision : D. Nicolas & C. Bouchard
Dupont, Luna. 2019-2020. Discovering scientific fish monitoring. 3 internships of 3 weeks in Year 12 & 13 of a vocational baccalauréat, Management of Natural Environments and Wildlife, Lycée des Calanques, Marseille
Parent, Maude. 2019. “Assessment of the hydro-biological connectivity between the marine environment and the Vaccarès lagoon complex via the ponds and marshes on the former Camargue saltworks site.” End of studies internship (Master 2), Ecole Nationale Supérieure Agronomique de Toulouse (School of Agricultural and Life Sciences)
Marc, François. 2019. Setting up fish monitorings. Internship BTEC Higher National Diploma, Management and Protection of Nature, 1^st year, Cours Diderot, Aix-en-Provence
Mutel, Stéphane. 2018. “Temporal variability of the trophic ecology of the Wels Catfish and European Eel in a drainage canal in the Camargue.” Master 2 internship, Polytech Tours, Urban and Territorial Planning and Environment, University of Tours. Co-supervision: D. Nicolas & C. Musseau (IGB, Berlin)
Chericoni, Nicolas. 2017. “Comparison of two temporal monitoring campaigns on wild fish in the Vaccarès Lagoon.” Master 2 internship, Statistics for Life and Healthcare Sciences
Chevallier, Adrien. 2016. “Transfer of ichthyofauna from the Rhone to the Camargue through irrigation pumping.” End of studies internship, Polytech Montpellier

Supervision of volunteers (civic services and European voluntary services)

Technical support for several fisheries monitoring operations. Maintenance and repair of equipment. Identification of fish and carcinological species. Biometry and data entry. Writing of illustrated mission reports. Production of communication tools for the general public. Realization of personal projects.

2022-2023 : Lefebvre, Chloé & Metayer-Rouchaleou, Margot
2021-2022 : Verbrugghe, Klervi
2020-2021 : Crassard, Tom
2020 : Boulongne, Patrice
2018 : Milesi, Dorian
2017 : Ferjančič, Kim
2016-2017 : Leborne, Florian

Education

2006-2010: PhD in Estuary Ecology, Irstea Bordeaux / University of Bordeaux 1
2004-2006: MSc in Oceanography with a concentration in Marine Biology and Ecology, Oceanology Centre, University of the Mediterranean, Aix-Marseille University II
2003-2004: BSc Biology of Living Organisms, ERASMUS programme, University of St Andrews
2001-2003: two-year degree in Life Sciences, University of Nice Sophia-Antipolis

Publications

Find below the most recent publications of Delphine Nicolas, or see the full list on the Tour du Valat’s documentary web portal:

Is malathion oncogenic for mosquitoes? A transcriptomic and histological study of adults derived from malathion exposed larvae
de Audrey Arnal, Erika Burioli, Lisa Jacquin, Sophie Labrut, Stéphane Duchon, Marie Rossignol, Delphine Nicolas, Beata Ujvari, Antoine Dujon, Jordan Meliani, et al. In Ecotoxicology and Environmental Safety, 301 (August, 2025), 118449 En ligne : www.sciencedirect.com[...] Malathion is a widely used pesticide with potentially oncogenic properties and may ... read more
How does the efficiency of Nanopore compare to Illumina sequencing in tracking the spread of aquatic invasive species?
de Théo Deremarque, Rodolphe Elie Gozlan, Ravo Ravaozafindrasoa, Giuliano Mucci, Lucie Delalex, Jean-Michel Foissy, Michael Cagnant, Mathieu Clair, Justina Givens, Fabienne Justy, et al. In Water Biology and Security, (en ligne) (May, 2025), 100423 En ligne : www.sciencedirect.com[...] eDNA-based methods offer a non-invasive, easy-to-use approach for monitoring aquatic ... read more
Investigating the quality of European silver eels by quantifying contaminants and parasite infestation in a French Mediterranean lagoon complex
de Amélie Hoste, Raphaël Lagarde, Elsa Amilhat, Colin Bouchard, Paco Bustamante, Adrian Covaci, Elisabeth Faliex, Emmanuelle Migne, Giulia Poma, Claire Tetrel, et al. In Environmental Science and Pollution Research, (en ligne) (January, 2025) En ligne : doi.org[...] Coastal lagoons are diverse habitats with significant ecological gradients, which provide ... read more
Life-history traits of the invasive and biggest European freshwater fish, the wels catfish (Silurus glanis) show high potential for colonisation in Southern Europe
de Jacques Panfili, Delphine Nicolas, Khady Diop, Alain J. Crivelli In Marine and Freshwater Research, 75(18) (December, 2024) En ligne : www.publish.csiro.au[...] The invasive wels catfish is spreading to many European waterbodies and is the subject of controversy concerning its environmental impact.The objective was to investigate its life-history ... read more
Ease and Limitations in Using Environmental DNA to Track the Spread of Invasive Host–Parasite Complexes: A Case Study of the Freshwater Fish Pseudorasbora parva and the Cryptic Fungal Parasite Sphaerothecum destruens
de Théo Deremarque, Rodolphe Elie Gozlan, Ravo Ravaozafindrasoa, Giuliano Mucci, Lucie Delalex, Jean-Michel Foissy, Michael Cagnant, Mathieu Clair, Justina Givens, Fabienne Justy, et al. In Fishes, 9(12) (December, 2024), 477 En ligne : www.mdpi.com[...] The spread of non-native species threatens biodiversity and exacerbates societal challenges like food security. ... read more
European eel (Anguilla anguilla) survival modeling based on a 22-year capture-mark-recapture survey of a Mediterranean subpopulation
de Amélie Hoste, Colin Bouchard, Jean-Christophe Poggiale, Delphine Nicolas In Journal of Fish Biology, Online version (October, 2024) En ligne : onlinelibrary.wiley.com[...] Since the 1980s, the European eel (Anguilla anguilla) has declined by over 90% in recruitment across its European and North African distribution area. This diadromous fish ... read more
Estimating migration speed of glass eels during their colonization of a Mediterranean lagoon
de Colin Bouchard, Delphine Nicolas In Journal of Fish Biology, 103(5) (November, 2023), 9 En ligne : onlinelibrary.wiley.com[...] Migration speed can have important evolutionary consequences as it can affect the timing of arrival, remaining energy reserves, and habitat choice. Environmental conditions and individual phenotypic traits can impact the ... read more
Patterns of genetic variation in native and non-native populations of European catfish Silurus glanis across Europe
de Paul Castagné, Ivan Paz-Vinas, Stéphanie Boulêtreau, Jessica Ferriol, Geraldine Loot, Charlotte Veyssière, Robert Arlinghaus, Robert Britton, Marlène Chiarello, Emili Garcia-Berthou, et al. In Biodiversity and conservation, Online April (April, 2023) En ligne : link.springer.com[...] Biological invasions are a major component of global change worldwide. But paradoxically, an ... read more
Spatio-temporal variations in glass eel recruitment at the entrance pathways of a Mediterranean delta
de Colin Bouchard, Hilaire Drouineau, Patrick Lambert, Olivier Boutron, Delphine Nicolas In ICES Journal of Marine Science, 79(6) (August, 2022), 1874-1887 En ligne : doi.org[...] Understanding spatio-temporal dynamics of glass eel recruitment is necessary to characterize eel population status and the stock of future elvers. Despite numerous studies ... read more
Impacts of environmental conditions and management of sluice gates on glass eel migration
de Colin Bouchard, Olivier Boutron, Jordane Labremon, Hilaire Drouineau, Patrick Lambert, Delphine Nicolas In Estuarine, Coastal and Shelf Science, Online (November, 2022), 108139 En ligne : www.sciencedirect.com[...] Anthropogenic barriers such as tidal gates impair animal migration and ecological continuity. For migratory fishes, barriers may alter or impeach both ... read more