Management strategies for invasive species: the importance of stock externalities

Carole Ropars-Collet (), Louis-Pascal Mahé, Philippe Le Goffe and Aurélien Million
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Carole Ropars-Collet: SMART-LERECO - Structures et Marché Agricoles, Ressources et Territoires - INRA - Institut National de la Recherche Agronomique - AGROCAMPUS OUEST, AGROCAMPUS OUEST
Louis-Pascal Mahé: AGROCAMPUS OUEST
Philippe Le Goffe: AGROCAMPUS OUEST, SMART-LERECO - Structures et Marché Agricoles, Ressources et Territoires - INRA - Institut National de la Recherche Agronomique - AGROCAMPUS OUEST
Aurélien Million: AGROCAMPUS OUEST

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Abstract: The management of an invasive species presents some similarities with rerlewable resources. However, the objective function is the sum of two positive and often increasing components : environmental damages and management costs. The paper stresses the importance of stock externalities to ensure that a non zero stock is optimal. In a static approach, the paper shows that when the damage function is always increasing, the absence ofstock externalities leads to a solution of eradication (zero stock) under usual assumptions. If the damage is decreasing (and negative as sometimes assumed) it is still possible that a non zero stock to be optimal. In the presence of externalities it is more likely that an interior solution be optimal, although it needs not to be the case. If the cost externalities tend to be infinitely large for low stock levels, then an eradication is ruled out. In the dynamic approach, conditions are given for an interior solution to exist. Again it is shown that the existence of externalities helps satisfy both first and second order (convexity) conditions for a solution stopping short from full eradication. An empirical illustration for Lud,wi,gi,a spp. will be given at the conference.

Keywords: Ludwigia grandiflora; Methodology; modelling; Economie de l'environnement; Invasion biologique; modélisation (search for similar items in EconPapers)
Date: 2005-06-23
Note: View the original document on HAL open archive server: https://hal.science/hal-02349924v1
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Published in 14th Annual Conference of the European Association of Environmental and Resource Economists, European Association of Environmental and Resource Economists (EAERE). INT., Jun 2005, Bremen, Germany. 18 p

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