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Etude écotoxicologique et environnementale de la rivière Drôme : application à la survie de la loutre

Abstract : In the late 1950s and 1960s, a steep decline in otter (Lutra lutra) populations took place throughout most of Western Europe. Many different explanations for this decline have been presented; e.g. hunting, habitat destruction, eutrophication, and toxic chemicals. A factor seems to occupy a dominating place in this disappearance: contamination of the food chains by organochlorine pesticides and polychlorinated biphenyls (PCBs).
In France, otter populations disappeared from many regions, but remain present in the Massif Central and on the Atlantic coast. There is also a residual population in Alsace, coming from a reintroduction campaign.
With the ZABR (Zone Atelier Bassin du Rhône) and in collaboration with the CORA (Centre Ornithologique Rhône-Alpes), we conducted a study on the Drôme river in order to evaluate the status of the local otter populations.
In parallel, an ecotoxicological study of this river was undertaken, with analysis of the cumulative pollutants (PCBs, organochlorine pesticides and heavy metals) along the food chain. A sociological survey evaluated the status of knowledge and the perception of this animal by the users of the river (fishermen, hunters, kayakers, etc).
Are otters present on the Drôme river bassin? Is this habitat suited to the survival of this animal? What is the status of pollution of this river? Which comparison can be made with the Ardèche and Alsace populations? Here are the major questions, which we tried to answer.
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Contributor : Alexandra Richard-Mazet <>
Submitted on : Wednesday, April 23, 2008 - 5:56:12 PM
Last modification on : Friday, October 23, 2020 - 4:40:03 PM
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  • HAL Id : tel-00275129, version 1
  • PRODINRA : 250786

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Alexandra Richard-Mazet. Etude écotoxicologique et environnementale de la rivière Drôme : application à la survie de la loutre. Sciences du Vivant [q-bio]. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00275129⟩

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