Abstract
Productive and ecologically highly valuable ecosystems, macrotidal estuaries are also characterised by complex habitat and connectivity dynamics driven by tidal and freshwater influence. Organisms living in these constantly changing systems have to match their movement patterns to the shifting habitat mosaic using available windows of connectivity to access habitat patches of interest. This appears particularly important for the juvenile stages of many fish species colonising shallow and intertidal areas of the estuaries as summer nurseries. We apply tools from landscape ecology to investigate the estuarine habitat and connectivity dynamics on the example of juvenile seabass (Dicentrarchus labrax). We test under which conditions spatio-temporal bottlenecks to estuarine nursery colonisation may emerge for this species in a human-modified estuary. Combining a hydrodynamic model of the Seine estuary with remote sensing data allows us to capture structural changes in habitat availability and connectivity at the estuarine scale and at a fine spatio-temporal resolution. With chronological least-cost modelling of successive tidal steps, we assess patterns of nursery accessibility and estimate tidal colonisation fronts for different mobility scenarios. We show that, at certain hydrological conditions, tidal water level variation causes local disruptions of habitat availability and connectivity, creating temporary bottlenecks for seabass juveniles’ movement. Fish mobility appears determinant for their vulnerability to these connectivity disruptions. Our approach allows for quantitative assessment and visualisation of riverscape complexity related to tidal dynamics. It is applicable to other highly dynamic ecosystems, where the mobile nature of connectivity and habitats needs to be integrated into conservation and management planning.
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Acknowledgements
This study has been carried out in the framework of the ANACONDHA project funded by the scientific research programme of the GIP Seine-Aval. We cordially thank Nicolas Bacq for his invaluable support, ideas and work orientations throughout the project; Anik Brind'Amour, Sylvain Duhamel, Eric Feunteun, Ronan Le Goff, Mike Pawson, Hélène de Pontual, Florian Rozanska and Stéphanie Moussard for sharing their expertise and time during fruitful discussions at different stages of this project; Jean-Philippe Lemoine for producing MARS-3D model outputs; Eric L’Ebrellec for preparing habitat and water depth maps and providing supplementary data on the Seine estuary; Sylvain Descloux for his support with improving Anaqualand and Amandine Zahm for running part of the tested scenarios. We kindly thank two anonymous reviewers and the editors for their very constructive and insightful comments that helped to substantially improve the manuscript throughout the revision process.
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Alp, M., Pichon, C.L. Getting from Sea to Nurseries: Considering Tidal Dynamics of Juvenile Habitat Distribution and Connectivity in a Highly Modified Estuarine Riverscape. Ecosystems 24, 583–601 (2021). https://doi.org/10.1007/s10021-020-00536-1
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DOI: https://doi.org/10.1007/s10021-020-00536-1