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Communication Dans Un Congrès Année : 2001

Impact of local pollution on fish abundance using geostatistical simulations

Résumé

The objective of this paper is to quantify the impact of human activities on the abundance of fresh water fish populations. In the case of populations of salmon juvenile on the Scorff river (Brittany, France), two punctual pollutions are caused by the discharges of two fish farms. Two perturbed sections have been identified on the main course of the river where salmon juvenile abundance is reduced. Assuming the pollution does not involve any change of density of juveniles salmons in the unperturbed sections, geostatistical simulations have been used to quantify the impact of the fish farms on the abundance of juvenile salmon. To this end, spatial structures of densities are analysed and modelled for two different cases : one using all the data to describe the "actual structure"; one using only the unperturbed data to estimate the "possible structure" of juvenile salmon in the absence of pollution. In each case, the structural model is used to simulate what could be the distribution of juveniles in areas perturbed by the fish farms. The difference between simulations conditioned by all the data or only by the unperturbed data, allows us to quantify the impact of the fish farms in terms of numbers of juveniles lost.
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Dates et versions

hal-04652952 , version 1 (18-07-2024)

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  • HAL Id : hal-04652952 , version 1

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Eric de Oliveira, Nicolas Bez. Impact of local pollution on fish abundance using geostatistical simulations. Third European Conference on Geostatistics for Environmental Applications, Pascal Monestiez; Denis Allard; Roland Froidevaux, Nov 2000, Avignon, France. ⟨hal-04652952⟩
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