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Conference papers

Impact of river network topology on European eel population dynamics estimated with a individual-based model

Abstract : Our work aims to produce tools for stock assessment of silver eels in a watershed, while taking into account the individual variability of biological processes. Individual-based modelling is a suitable approach for representing precisely these dynamics of aquatic population. However its stochasticity make models analysis harder compared to lattice models. Aggregating the hydrographic network would supply a simplification of its representation and a easier interpretation of individual-based model dynamics, furthermore it would reduce computation time. We have developed an individual-based model (IBM) of eels population dynamics in a drainage basin, equivalent to the lattice model, previously developed by (Lambert, 2005, PhD thesis, Univ. Bordeaux). The river network is longitudinally split into homogeneous reaches with same length. All the characteristics of each reach are summed up in a carrying capacity. Recruitment, age-related processes, and movement of individuals are the main mechanisms taken into account. Recruitment is modelled with a symmetric beta law, limited by the beginning and ending date of the migratory season. Movement are related to colonization, food research, which depend on departure and arrival reaches saturation. Age-related processes include ageing, sex differentiation, silvering and mortality. Population dynamics is summarized by silver eels production per reach or age structure of silver eels flux.First, we have validated IBM with the lattice model in the same river basin. Then, we have tested with these two models the effect of the topology of the river network.And we have developed some methods to aggregate this network.The consequences of the results on field data interpretation and management advise are prospected.
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Conference papers
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Submitted on : Friday, May 15, 2020 - 12:52:18 PM
Last modification on : Monday, October 4, 2021 - 4:01:54 PM

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  • HAL Id : hal-02588624, version 1
  • IRSTEA : PUB00020850

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Nicolas Dumoulin, Patrick Lambert, Thierry Faure, Eric Rochard. Impact of river network topology on European eel population dynamics estimated with a individual-based model. Fish and Diadromy in Europe international symposium 2005 (FDE2005), Bordeaux, FRA, mars 2005, 2005, Bordeaux, France. pp.47. ⟨hal-02588624⟩

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