DÉZERALD Olivier
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Scientist Theme(s) : Spatial dynamics, connectivity, habitat and functional area
Ecosystems assessment and multiple anthrophic pressure
Address: UMR DECOD, 65 rue de Saint-Brieuc, Bât. 19 , CS 84215, 35042 Rennes Cedex, France Keywords: Ecology, Biology  |
Expertise
Community ecology, functional ecology, food webs, population dynamics, aquatic and terrestrial macroinvertebrates, fish species, spatial-temporal heterogeneity, stoichiometry, isotopy
Current Position
Research scientist
Career
- 2019 - present: Research scientist at INRAE Rennes, UMR ESE
- 2017 - 2018: Postdoctoral fellow with Philippe Usseglio-Polatera (Université de Lorraine, Metz, France)
- 2016 - 2017: Postdoctoral fellow with Angélica González (Rutgers University, Camden, USA) and Claudio Latorre (Pontificia Universidad Católica de Chile, Santiago, Chili)
- 2012 - 2015: Ph.D. student supervised by Céline Leroy (IRD, Kourou, France) and Régis Céréghino (Université Paul Sabatier, Toulouse, France)
Research
At the interface between organismal biology and community ecology, my research aims to better understand and predict the structural (species diversity and composition) and functional (flows of matter and energy, functional traits) responses of communities to natural and anthropogenic environmental changes.
To meet this objective, I study two biological compartments: aquatic and terrestrial macroinvertebrate communities and fish communities.
My research combines empirical approaches (observations in natura), in situ and ex situ experiments, and modelling approaches at various spatial (local to continental) and temporal scales (days to millenia) to address specific questions.
Current Research Topics
My current research in the Conservation and Restoration of Aquatic Ecosystems research group (UMR ESE) is in the context of restoring the ecological continuity of the Sélune River (removal of two dams: Vezin and la Roche-qui-boit). My research aims to understand the subsequent modifications in trophic relationships and the structural and functional diversity of aquatic and terrestrial macroinvertebrates in relation to i) the colonisation dynamics of new habitats (river bank, channel), and ii) interactions with riparian vegetation.
Collaboration
Member of the Bromeliad Working Group
Current projects
SELUNE Multidisciplinary study of the Selune river restoration following the removal of two large dams | Timeframe : 2012 - 2028 Keywords : Connectivité / Cycle de vie / Dynamique des populations / Ecologie spatiale / Fronts de colonisation / Habitats essentiels / Interactions trophiques / Invasions biologiques / Migration / Restauration / Barrages / Biofilms / Communautés / Dispersion / Ecosystèmes / Individus / Macroinvertébrés / Phytoplankton / Plantes / Poissons / Populations / ADNe / Analyses de séries temporelles / Biologging / Capture, échantillonnage et inventaire / Génétique quantitative / Hydroacoustique / Isotopes stables / Marquage-recapture / Télémétrie |
| Timeframe : 2021 - 2024 Keywords : cascades trophiques / Interactions trophiques / Stabilité des réseaux / Macroinvertébrés / Poissons / ADNe / Isotopes stables |
Analyse Multicritère de l’effet potentiel des Obstacles à l’écoulement sur les communautés BIOlogiques | Timeframe : 2021 - 2024 Keywords : Connectivité / Ecologie spatiale / Habitats essentiels / Migration / Multi-stress / Réseaux d’interaction / Usages / Barrages / Communautés / Dispersion / Macroinvertébrés / Méta-communautés / Poissons / Analyses de séries temporelles / Bio-informatique / Développement de scripts / Géomatique / Modélisation statistique / Statistiques multivariées |
Unifying environmental and spatial determinants of food web structure across spatial scales
sCaleWebs
2018-2020
Keywords: aquatic food webs, functional traits, environmental and spatial processes, macroinvertebrates, tank bromeliads, Neotropics
M.Sc. Students
BERGERE, C. (2021) .Diversite fonctionnelle des macroinvertebres a l'interface aquatique-terrestre
MOUSSAY, M. (2023) Effets potentiels des obstacles à l'écoulement sur la composition taxonomique et fonctionnelle des espèces de poissons amphihalins vs. exotiques et envahissants dans le cadre complexe des réseaux dentriques
VIOLTON, O. (2023) L'effet des invasions biologiques sur la structure et la stabilité des communautés natives : Approche expérimentale en mésocosmes avec l'écrevisse de Louisiane
Publications
Selection of Scientific Products
Piscart Christophe, Dézerald Olivier, Pellan Laura, Le Bris Nathalie, Rodríguez-Pérez Héctor, Beauverger Thibaut, Huteau Dominique, Roussel Jean-Marc (2024). Persistent disconnect between flow restoration and restoration of river ecosystem functions after the removal of a large dam on the Sélune River. Frontiers in Environmental Science, 2024, 12, pp.1250810. ⟨10.3389/fenvs.2024.1250810⟩
Roussel Jean-Marc, Fraisse Stéphane, Dézerald Olivier, Fovet Ophélie, Pannard Alexandrine, Perez Hector Rodriguez, Crave Alain, Gorzerino Caroline, Poupelin Maxime, Forget Guillaume, Huteau Dominique, Thomas Alban, Cheve Manuel, Soissons Laura, Piscart Christophe (2024). Effects of large dams on the aquatic food web along a coastal stream with high sediment loads. Frontiers in Ecology and Evolution, 2024, Frontiers in Ecology and Evolution, 11, pp.1250892. ⟨10.3389/fevo.2023.1250892⟩
Dézerald Olivier, Roussel Jean-Marc, Lanoë Elven, Beauverger Thibaut, Bazin Alan, Rodríguez-Pérez Héctor, Dufour Simon, Bernez Ivan, Piscart Christophe (2023). Fast but transient recovery of aquatic and terrestrial communities after a large dam removal. Frontiers in Ecology and Evolution, 2023, 11, 13 p. ⟨10.3389/fevo.2023.1254462⟩
Jaballah Sami, Fernandez Garcia Guglielmo, Martignac François, Parisey Nicolas, Jumel Stéphane, Roussel Jean-Marc, Dézerald Olivier (2023). A deep learning approach to detect and identify live freshwater macroinvertebrates. Aquatic Ecology, 2023, 57 (4), pp.933-949. ⟨10.1007/s10452-023-10053-7⟩
Srivastava Diane, Macdonald A. Andrew M., Pillar Valério, Kratina Pavel, Debastiani Vanderlei, Guzman Laura Melissa, Trzcinski Mark Kurtis, Dézerald Olivier, Barberis Ignacio, de Omena Paula, Romero Gustavo, Ospina-Bautista Fabiola, Marino Nicholas, Leroy Céline, Farjalla Vinicius, Richardson Barbara, Gonçalves Ana, Corbara Bruno, Petermann Jana, Richardson Michael, Melnychuk Michael, Jocqué Merlijn, Ngai Jacqueline, Talaga Stanislas, Piccoli Gustavo, Montero Guillermo, Kirby Kathryn, Starzomski Brian, Céréghino Régis (2023). Geographical variation in the trait‐based assembly patterns of multitrophic invertebrate communities. Functional Ecology, 2023, 37 (1), pp.73-86. ⟨10.1111/1365-2435.14096⟩
Céréghino Régis, Trzcinski Mark Kurtis, Macdonald A. Andrew M., Marino Nicholas, Acosta Mercado Dimaris, Leroy Celine, Corbara Bruno, Romero Gustavo, Farjalla Vinicius F., Barberis Ignacio M., Dézerald Olivier, Hammill Edd, Atwood Trisha B., Piccoli Gustavo, Ospina Bautista Fabiola, Carrias Jean-Francois, Leal Juliana S., Montero Guillermo, Antiqueira Pablo, Freire Rodrigo, Realpe Emilio, Amundrud Sarah L., Omena Paula M. De, Campos Alice, Srivastava Diane S. (2022). Functional redundancy dampens precipitation change impacts on species‐rich invertebrate communities across the Neotropics. Functional Ecology, 2022, 36 (7), pp.1559-1572. ⟨10.1111/1365-2435.14048⟩
Meyer Albin, Alric Benjamin, Dézerald Olivier, Billoir Elise, Coulaud Romain, Larras Floriane, Mondy Cédric, Usseglio-Polatera Philippe (2022). Linking Micropollutants to Trait Syndromes across Freshwater Diatom, Macroinvertebrate, and Fish Assemblages. Water, 2022, 14 (8), pp.1184. ⟨10.3390/w14081184⟩
Dézerald Olivier, Gorzerino Caroline, Fourcy Damien, Collinet Marc, Coudreuse Julie, Edeline Eric (2021). Eco-evolutionary effects of invasive crayfish on aquatic ecosystems. 2nd international aquatic mesocosm research symposium: From local processes to cross-domain actions, Hellenic Centre for Marine Research, Apr 2021, Virtual symposium, Greece
Guzman Laura Melissa, Trzcinski M. Kurtis, Barberis Ignacio, Céréghino Régis, Srivastava Diane, Gilbert Benjamin, Pillar Valério, de Omena Paula, Macdonald Andrew, Corbara Bruno, Leroy Celine, Ospina Bautista Fabiola, Romero Gustavo, Kratina Pavel, Debastiani Vanderlei, Gonįalves Ana, Marino Nicholas, Farjalla Vinicius, Richardson Barbara, Richardson Michael, Dézerald Olivier, Piccoli Gustavo, Jocqué Merlijn, Montero Guillermo (2021). Climate influences the response of community functional traits to local conditions in bromeliad invertebrate communities. Ecography, 2021, 44 (3), pp.440-452. ⟨10.1111/ecog.05437⟩
Alric Benjamin, Dézerald Olivier, Meyer Albin, Billoir Elise, Coulaud Romain, Larras Floriane, Mondy Cédric, Usseglio-Polatera Philippe (2021). How diatom-, invertebrate- and fish-based diagnostic tools can support the ecological assessment of rivers in a multi-pressure context: Temporal trends over the past two decades in France. Science of the Total Environment, 2021, 762, pp.143915. ⟨10.1016/j.scitotenv.2020.143915⟩