OSMOSE: A Multispecies Individual-Based Model to Explore the Functional Role of Biodiversity in Marine Ecosystems
Yunne-Jai Shin and Philippe Cury
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Considering the management of marine resources as the management of an ecosystem integrating different interactive components has enriched our understanding of fisheries dynamics. Indeed, the dynamics of marine exploited communities do not only reflect the effects of fishing mortality and of hydroclimatic conditions but is also the result of multiple interspecific interactions. An individual-based model OSMOSE(Object-oriented Simulator of Marine biOdiverSity Exploitation) is developed in Java programming language to explore the functional role of biodiversity in the exploitation of multispecies systems. By its flexibility, individual-based modeling permits implementation of different levels of biodiversity. In OSMOSE, species are age- and size-structured and modeled as interacting in the bosom of a spatial trophic web. Each species can be the predator or the prey of another species depending on its stage of its life cycle. Two simple rules form the basis of the trophic model. There is first a criterion of body length for the selection of prey and secondly a law of spatiotemporal co-occurrence. Thus, the fishes would prey regardless of the taxonomic identity of their prey and, moreover, predation and competition can vary with time, according to species abundances and changes.
- Item number: AK-SG-99-01aq
- Year: 1999
- DOI: https://doi.org/10.4027/eafm.1999.43