Conservation de la biodiversité et changement climatique : un nécessaire changement de paradigme - Le cas des poissons migrateurs amphihalins Change in the climate and in the biodiversity-conservation paradigm The case of diadromous fish

• Main Author: Éric Rochard et Géraldine Lassalle
• Format: Article
• Language: fra
• Published: Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE) 2010-10-01
• Series: Sciences, Eaux & Territoires
• Subjects: BIODIVERSITE; CHANGEMENT CLIMATIQUE; ESPECE MIGRATRICE; POISSON
• Online Access: http://www.set-revue.fr/sites/default/files/archives/18_article.pdf

Les espèces les plus menacées font l’objet de plans de restauration visant à retrouver une situation antérieure jugée plus satisfaisante. Mais le changement climatique qui s'est opéré dans certaines régions nécessite de se poser la question de l'utilité de retrouver une situation antérieure devenue impossible à reproduire.<br>The conservation of biodiversity is a recent concept which is mainly based on European directives and international conventions which do not consider the dynamic nature of ecological systems. Up to now, the aim was to restore a historical situation judged more satisfactory for a species, a habitat or an ecosystem. The ongoing climate change imposes a change of strategy because in some cases it will not be possible to restore the previous situation (temperature, precipitations). It is necessary to revise the geographical location of planned conservation measures and to amplify the measures facilitating the repositioning of species (improvement of connectivity). Beyond the questions on the climate scenarios used as input, these results overturn current rationales and raise serious questions concerning certain specific measures when projection models do not guarantee survival conditions for a particular species.