Disentangling the components of coastal fish biodiversity in southern Brittany by applying an environmental DNA approach

Type Article
Date 2022-07
Language English
Author(s) Rozanski RomaneORCID1, Trenkel VerenaORCID1, Lorance PascalORCID1, Valentini Alice2, Dejean Tony2, Pellissier LoïcORCID3, 4, Eme DavidORCID1, 5, Albouy CamilleORCID1
Affiliation(s) 1 : DECOD (Ecosystem Dynamics and Sustainability) IFREMER, INRAE, Institut Agro—Agrocampus Ouest Nantes ,France
2 : SPYGEN Le Bourget‐du‐Lac , France
3 : Landscape Ecology, Institute of Terrestrial Ecosystems Department of Environmental Systems Science, ETH Zürich Zürich ,Switzerland
4 : Unit of Land Change Science Swiss Federal Research Institute WSL Birmensdorf,Switzerland
5 : RiverLY Research Unit National Research Institute for Agriculture Food and Environment (INRAE) Villeurbanne ,France
Source Environmental DNA (2637-4943) (Wiley), 2022-07 , Vol. 4 , N. 4 , P. 920-939
DOI 10.1002/edn3.305
Mot-Clé(s) Actinopterygii, beta-diversity, Chondrichthyes, functional diversity, Iroise Sea, metabarcoding, phylogenetic diversity, taxonomic diversity

The global biodiversity crisis from anthropogenic activities significantly weakens the functioning of marine ecosystems and jeopardizes their ecosystem services. Increasing monitoring of marine ecosystems is crucial to understand the breadth of the changes in biodiversity, ecosystem functioning and propose more effective conservation strategies. Such strategies should not only focus on maximizing the number of species (i.e., taxonomic diversity) but also the diversity of phylogenetic histories and ecological functions within communities. To support future conservation decisions, multicomponent biodiversity monitoring can be combined with high-throughput species assemblage detection methods such as environmental DNA (eDNA) metabarcoding. Here, we used eDNA to assess fish biodiversity along the coast of southern Brittany (France, Iroise Sea). We filtered surface marine water from 17 sampling stations and applied an eDNA metabarcoding approach targeting Actinopterygii and Elasmobranchii taxa. We documented three complementary biodiversity components—taxonomic, phylogenetic, and functional diversity—and three diversity facets—richness, divergence and regularity. We identified a north/south contrast with higher diversity for the three facets of the biodiversity components in the northern part of the study area. The northern communities showed higher species richness, stronger phylogenetic overdispersion and lower functional clustering compared to the ones in the southern part, due to the higher diversity of habitats (reefs, rocky shores) and restricted access for fishing. Moreover, we also detected a higher level of taxonomic, phylogenetic, and functional uniqueness in many offshore stations compared to more coastal ones, with the presence of species typically living at greater depths (> 300 m), which suggests an influence of hydrodynamic structures and currents on eDNA dispersion and hence sample composition. eDNA metabarcoding can, therefore, be used as an efficient sampling method to reveal fine-scale community compositions and in combination with functional and phylogenetic information to document multicomponent biodiversity gradients in coastal marine systems.

Full Text
File Pages Size Access
Publisher's official version 20 5 MB Open access
Appendix S1-S14 4 MB Open access
Top of the page

How to cite 

Rozanski Romane, Trenkel Verena, Lorance Pascal, Valentini Alice, Dejean Tony, Pellissier Loïc, Eme David, Albouy Camille (2022). Disentangling the components of coastal fish biodiversity in southern Brittany by applying an environmental DNA approach. Environmental DNA, 4(4), 920-939. Publisher's official version : https://doi.org/10.1002/edn3.305 , Open Access version : https://archimer.ifremer.fr/doc/00768/88002/