Author:
Navarro Clara,Janc Anais,Lassalle Géraldine,Lambert Patrick,Dambrine Chloé
Abstract
IntroductionMany diadromous fish species are currently facing the threat of generalized population extirpations across their range, and conservation efforts implemented primarily within the continental domain may not be sufficient to ensure their viability. In consequence, better understanding the use of the marine environment by these species turned out to be critical.Material and methodWe developed marine species distribution models for two species, Allis shad (Alosa alosa) and the European flounder (Platichthys flesus), and proposed a way to interpret the habitat suitability from a more functional perspective. Our approach defined marine habitats as highly suitable environments that remained with a high potential through the species life stage duration at sea. First, a species-specific probabilistic threshold was applied to select for highly suitable environments each year of the simulations. Then, annual maps of high suitability were combined into recurrence maps showing areas were the environmental conditions remained the most suitable across the life at sea of the given species, these areas being called ‘marine habitats’. We applied this approach to study the current and future marine habitats of Allis shad and European flounder under climate change scenarios.ResultsThe main current marine habitats of these species were coastal, primarily in the Bay of Biscay for Allis shad and in the English Channel-North Sea for European flounder. These habitats are expected to experience minimal changes by mid-century, and the species may even benefit from new habitats at higher latitudes. However, the European flounder is likely to face greater challenges in the central part of its range by the end of the century, as potential spawning grounds may be threatened.DiscussionThis study provided a way to rethink ‘traditional’ suitability maps by integrating basic knowledge on the diadromous species life at sea. Our findings were part of a larger effort to link continental and marine habitats in improving management of diadromous species.
Subject
Ocean Engineering,Water Science and Technology,Aquatic Science,Global and Planetary Change,Oceanography
Reference78 articles.
1. Assessing the accuracy of species distribution models : Prevalence, kappa and the true skill statistic (TSS): Assessing the accuracy of distribution models;Allouche;J. Appl. Ecol.,2006
2. Looking for striped bass in Atlantic Canada : the reconciliation of local, scientific, and historical knowledge;Andrews;Northeast. Nat.,2019
3. Fish conservation in freshwater and marine realms : Status, threats and management: Fish Conservation in Freshwater and Marine Realms;Arthington;Aquat. Conserv.: Mar. Freshw. Ecosyst.,2016
4. Using acoustic telemetry to locate flatfish spawning areas : Estuarine migrations of turbot Scophthalmus maximus and European flounder Platichthys flesus;Baden;J. Sea Res.,2022
5. The allis shad alosa alosa : biology, ecology, range, and status of populations;Baglinière;In Am. Fish. Soc. Symp.,2003