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Dealing with uncertainty in qualitive models with a semi-quantitative approach based on simulations – Applications to the Gironde estuarine food web

1. Introduction
2. Materials and methods
2.1. Two commonly used matrices inversion methods
2.2. A new method applied to the Gironde estuary
2.3. Validation of the new community matrix
2.4. Development of a semi-quantitative approach
2.5. Testing the choice of classes for interaction values
3. Results
3.1. Comparison between the negative inverse of the new community matrix and « mixed trophic impact » approach
3.2. Sensitivity to the choice of number of class interactions
3.3. Comparison of the results with those of the reference matrix R
4. Discussion
4.1. Construction of the new matrix and the semi-quantitative method
4.2. Some elements of interpretation for the Gironde estuarine food web
5. Conclusion
Acknowledgements
References