From the modeling of diadromous species’ marine distributions to the characterization of their current and future marine habitats

Introduction Many diadromous fish species are currently facing the threat of generalized population extirpations across their range, and conservation efforts implemented primarily within continental domain may not be sufficient to ensure viability. In consequence, better understanding use marine environment by these turned out critical. Material method We developed distribution models for two species, Allis shad ( Alosa alosa ) European flounder Platichthys flesus ), proposed a way interpret habitat suitability from more functional perspective. Our approach defined habitats as highly suitable environments that remained with high potential through life stage duration at sea. First, species-specific probabilistic threshold was applied select each year simulations. Then, annual maps were combined into recurrence showing areas environmental conditions most sea given being called ‘marine habitats’. this study current future under climate change scenarios. Results The main coastal, in Bay Biscay English Channel-North Sea flounder. These expected experience minimal changes mid-century, even benefit new higher latitudes. However, is likely face greater challenges central part its range end century, spawning grounds threatened. Discussion This provided rethink ‘traditional’ integrating basic knowledge on findings larger effort link improving management species.