Assessment of European yellow eel (Anguilla anguilla) densities in metropolitan France, based on their diffusion in catchments with the TABASCO model

• Main Authors: Domange, J., Drouineau, Hilaire, Briand, Cédric, Beaulaton, Laurent, Lambert, Patrick
• Other Authors: Ecosystèmes aquatiques et changements globaux (UR EABX), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Institution d'aménagement de la Vilaine, Institution d'aménagement de la Vilaine (IAV), Agence Française pour la Biodiversité (AFB), Pôle OFB-INRAE- Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, AGROCAMPUS OUEST-Université de Pau et des Pays de l'Adour (UPPA)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Office français de la biodiversité (OFB), National Recherche (appel d'offres national ou régional), irstea
• Format: Report
• Language: French
• Published: HAL CCSD 2016
• Subjects: TABASCO MODELE; FRANCE; [SDE]Environmental Sciences; Anguilla anguilla
• Online Access: https://hal.inrae.fr/hal-02602321; https://hal.inrae.fr/hal-02602321/document; https://hal.inrae.fr/hal-02602321/file/pub00046241.pdf

[Departement_IRSTEA]Eaux [TR1_IRSTEA]QUASARE The probabilistic approach of the EDA model led us to experiment an alternative modelling method named TABASCO for « spaTialized Anguilla BASin COlonization assessment model ». TABASCO should be considered as an intermediary between strictly statistical approaches and mechanistic models. It is based on the spread of a cohort of eels formalized by a Gaussian distribution through an oriented graph associated to the hydrographic network of a catchment. The result of this diffusion process should allow to estimate the distribution and the number of yellow eels at the end of the colonization of a catchment. A work of C++ coding, together with a calibration with the electrofishing data of a reference catchment (Gironde) led to a stable version of the model. The code has then been adapted to take into account all the catchments whom outlet is located in metropolitan France, which represents a total of 953 catchments and a 500979 km2 surface (90,81 % of the metropolitan France). The calibration is now carried out year per year between 1990 and 2009, and an « EMU » (Eel Management Units) effect has been added to take into account the geographical distribution of the eels when they arrive at the french coasts, thus refining the model predictions. Moreover, the features of TABASCO have been planned to assess upstream mortalities and to compare them with downstream mortalities. This technical report includes a discussion of the results and a diagnosis in order to improve or rectify the modelling later. L’approche probabiliste du modèle EDA nous a conduit à expérimenter une démarche alternative de modélisation nommée TABASCO pour « spaTialized Anguilla BASin COlonization ». Le modèle TABASCO doit être considéré comme un intermédiaire entre des méthodes strictement statistiques et des modèles mécanistes. Il repose sur la propagation d’une cohorte d’anguilles, formalisée par une distribution gaussienne, au travers d’un graphe orienté associé au réseau hydrographique d’un bassin ...