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Disentangling the effects of eutrophication and natural variability on macrobenthic communities across French coastal lagoonsuse asterix (*) to get italics
Auriane G. Jones, Gauthier Schaal, Aurélien Boyé, Marie Creemers, Valérie Derolez, Nicolas Desroy, Annie Fiandrino, Théophile L. Mouton, Monique Simier, Niamh Smith, Vincent OuissePlease use the format "First name initials family name" as in "Marie S. Curie, Niels H. D. Bohr, Albert Einstein, John R. R. Tolkien, Donna T. Strickland"
<p style="text-align: justify;">Coastal lagoons are transitional ecosystems that host a unique diversity of species and support many ecosystem services. Owing to their position at the interface between land and sea, they are also subject to increasing human impacts, which alter their ecological functioning. Because coastal lagoons are naturally highly variable in their environmental conditions, disentangling the effects of anthropogenic disturbances like eutrophication from those of natural variability is a challenging, yet necessary issue to address. Here, we analyze a dataset composed of macrobenthic invertebrate abundances and environmental variables (hydro-morphology, water, sediment and macrophytes) gathered across 29 Mediterranean coastal lagoons located in France to characterize the main drivers of community composition and structure. Using correlograms, linear models and variance partitioning, we found that lagoon hydro-morphology (connection to the sea and surface) which affects the level of environmental variability (salinity and temperature), as well as lagoon-scale benthic habitat diversity (using macrophyte morphotypes) seemed to regulate macrofauna distribution, while eutrophication and associated stressors like low dissolved oxygen acted upon the existing communities, mainly by reducing species richness and diversity. Furthermore, M-AMBI, a multivariate index composed of species richness, Shannon diversity and AMBI (AZTI’s Marine Biotic Index) and currently used to evaluate the ecological state of French coastal lagoons, was more sensitive to eutrophication (18%) than to natural variability (9%) with nonetheless 49% of its variability explained jointly by both. To improve the robustness of benthic indicators like M-AMBI and increase the effectiveness of lagoon benthic habitat management, we call for a revision of the ecological groups at the base of the AMBI index and of the current lagoon typology which could be inspired by the lagoon-sea connection levels used in this study.</p> should fill this box only if you chose 'All or part of the results presented in this preprint are based on data'. URL must start with http:// or https:// should fill this box only if you chose 'Scripts were used to obtain or analyze the results'. URL must start with http:// or https://
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Mediterranean Sea, macrofauna, taxonomic diversity, M-AMBI, macrophyte morphotypes, variance partitioning
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Biodiversity, Community ecology, Ecosystem functioning, Marine ecology
Angel Perez-Ruzafa (, Christian Grenz (, Karen Mc Glathery (, Michele Mistri (, Hocein Bazairi (, Christian Grenz [] suggested: I really dont' have time right now. Please try my colleague Lionel Denis at, Kaylee P. Smit suggested: Kendyl Wright , Matthew J. Pruden suggested: Dr. David Gilett,, Lionel Denis [] suggested: Sorry, but I have published in the last 4 years with the first author and another co-author. Suggestions:, Lionel Denis [] suggested: Sylvain Rigaud :, Lionel Denis [] suggested: Valerie Mesnage :, Kendyl Wright suggested: Fiona Mackay ( No need for them to be recommenders of PCIEcology. Please do not suggest reviewers for whom there might be a conflict of interest. Reviewers are not allowed to review preprints written by close colleagues (with whom they have published in the last four years, with whom they have received joint funding in the last four years, or with whom they are currently writing a manuscript, or submitting a grant proposal), or by family members, friends, or anyone for whom bias might affect the nature of the review - see the code of conduct
Angel Borja (, Lisandro Benedetti-Cecchi ( John Doe []
2023-09-08 11:26:01
Nathalie Niquil
Matthew J. Pruden