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Nematode diversity patterns in mangroves: a review of environmental drivers at different spatial scales

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Abstract

Mangroves are among the most productive ecosystems on Earth, yet they are disappearing at a dramatic rate. Mangrove sediments harbor microscopic nematodes, which show specific responses to variations of sediment physicochemical conditions, thus being potential bioindicators for conservation purposes. Nematode communities are subject to the strong heterogeneity of mangroves and predicting their distribution remains laborious at global and regional scale, thus hampering final statements about bioindication. In this review, we analyze relevant research on mangrove nematode diversity in order to identify the ecological mechanisms shaping the nematode community at the global, local and micro scales, and to hierarchize the environmental drivers responsible for nematode genera sorting. At the global scale, nematode genera richness is positively influenced by latitude and community composition changes according to geographical regions. At the local scale, nematode richness, density and community composition follow opposite patterns along a land-sea continuum and mangrove trees may be responsible for the variations of sediment chemistry leading to such community patterns. At the microhabitat scale, the community shows unexpected similarities between a priori different habitats. Epistrate and detritus feeders dominate mangroves, but except for trophic groups, the use of functional traits is inconsistent among studies, thus impeding conclusions. Further understanding of the role of environmental filters in shaping nematode diversity at different spatial scales cannot overlook data gaps in unexplored mangrove areas and the heterogeneity of microhabitats. Future studies should investigate nematode diversity with cutting-edge approaches, such as β-diversity partitioning, functional traits and metacommunity analysis, and eventually integrate nematodes, microbes and macrofauna in a comprehensive framework.

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Acknowledgements

A. Spedicato’s PhD thesis was funded by the Office de l’Eau de la Guyane (OEG) and Région Bretagne (France). This study was co-funded by the French Research Institute for Sustainable Development (IRD), the Office français de la Biodiversité (OFB) and the graduate school for the blue planet (EUR-ISBLUE) under the French program "Investissements d'Avenir" (ANR-17-EURE-0015). This work is a GDR LIGA contribution.

Funding

This work was supported by the Office de l’Eau de la Guyane (OEG), Région Bretagne and the Université de Bretagne Occidentale (UBO). It was co-funded by the French Research Institute for Sustainable Development (IRD), the Office français de la Biodiversité (OFB) and the graduate school for the blue planet (EUR-ISBLUE) under the French program "Investissements d'Avenir" (ANR-17-EURE-0015).

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AS designed the paper, performed the literature search and drafted the manuscript. EM contributed in shaping the structure of the manuscript and in revising the content. GT revised the manuscript in both content and form. DZ contributed to the revision.

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Correspondence to Adriana Spedicato.

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The authors have no relevant financial or non-financial interests to disclose.

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Communicated by Louise Ashton.

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Spedicato, A., Zeppilli, D., Thouzeau, G. et al. Nematode diversity patterns in mangroves: a review of environmental drivers at different spatial scales. Biodivers Conserv 32, 1451–1471 (2023). https://doi.org/10.1007/s10531-023-02562-6

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  • DOI: https://doi.org/10.1007/s10531-023-02562-6

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