Energy budget modeling of the environmental and individual determinism of precocious maturation in male juvenile Atlantic salmon (Salmo salar L.)

• Main Author: Baillif, Hélène
• Other Authors: Ecologie Comportementale et Biologie des Populations de Poissons (ECOBIOP), Institut National de la Recherche Agronomique (INRA)-Université de Pau et des Pays de l'Adour (UPPA), France. Université de Rennes 1 (UR1), FRA., Charlotte Recapet, Olivier Lepais, Matthieu Buoro
• Format: Master Thesis
• Language: English
• Published: HAL CCSD 2019
• Subjects: atlantic salmon; DEB model; precocious maturation; life history strategy; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; Atlantic salmon; Salmo salar
• Online Access: https://hal.inrae.fr/hal-02787441; https://hal.inrae.fr/hal-02787441/document; https://hal.inrae.fr/hal-02787441/file/BaillifH%C3%A9l%C3%A8ne_M2_2019_1.pdf

Master This study presents the use of a model based on the theory of dynamic energy budget (DEB theory) in order to trace the evolution of state variables over time as well as the sizes and weights of individuals by identifying the strategies of life history adopted by individuals taking into account environmental and individual variability. A first model that serves as a basis for further study is created, it is a standard DEB model of Atlantic salmon (Salmo salar L.). Its parameters are estimated from data collected in the literature coming from very different populations. A model is then created, based on the previous one with the consideration of precocious maturation and smoltification decisions. This new model, unlike the first one, represents only the juveniles of Atlantic salmon (Salmo salar L.). The simulations of the models are made over 600 days since the egg state of the individuals. Different models are then tested taking into account the variability of the initial egg size, the seasonal variability of the temperature and the quantity of food present in the environment and finally the individual variability of the food acquisition. The last model allows a rough prediction of the strategies adopted by a population by taking the example of a Scorff river population (Brittany, France). This model has to be improved to allow the prediction of salmon life history strategies based on their juvenile stage conditions, starting by estimating all parameters of the latter model from observations Cette étude présente l’utilisation d’un modèle basé sur la théorie de budget dynamique (DEB theory) afin de tracer l’évolution des variables d’états au cours du temps ainsi que des tailles et poids des individus en identifiant les stratégies d’histoire de vie adoptés par les individus en prenant en compte de la variabilité environnementale et individuelle. Un premier modèle qui sert de base à la suite de l’étude est créé, il s’agit d’un modèle DEB standard du saumon Atlantique (Salmo salar L.). Ses paramètres sont ...