DNA metabarcoding reveals differences in distribution patterns and ecological preferences among genetic variants within some key freshwater diatom species
Ver/Abrir
Autor/a
Pérez-Burillo, Javier
Leira, Manel
Keck, François
Rimet, Frédéric
Sigró, Javier
Mann, David G.
Fecha de publicación
2021-07-20ISSN
0048-9697
Resumen
Our study evaluates differences in the distribution and ecology of genetic variants within several ecologically important diatom species that are also key for Water Framework Directive monitoring of European rivers: Fistulifera saprophila (FSAP), Achnanthidium minutissimum (ADMI), Nitzschia inconspicua (NINC) and Nitzschia soratensis (NSTS). We used DADA2 to infer amplicon sequence variants (ASVs) of a short rbcL barcode in 531 environmental samples from biomonitoring campaigns in Catalonia and France. ASVs within each species showed different distribution patterns. Threshold Indicator Taxa ANalysis revealed three ecological groupings of ASVs in both ADMI and FSAP. Two of these in each species were separated by opposite responses to calcium and conductivity. Boosted regression trees additionally showed that both variables greatly influenced the occurrence of these groupings. A third grouping in FSAP was characterized by a negative response to total organic carbon and hence was better represented in waters with higher ecological status than the other FSAP ASVs, contrasting with what is generally assumed for the species. In the two Nitzschia species, our analyses confirmed earlier studies: NINC preferred higher levels of calcium and conductivity. Our findings suggest that the broad ecological tolerance of some diatom species results from overlapping preferences among genetic variants, which individually show much more restricted preferences and distributions. This work shows the importance of studying the ecological preferences of genetic variants within species complexes, now possible with DNA metabarcoding. The results will help reveal and understand biogeographical distributions and facilitate the development of more accurate biological indexes for biomonitoring programmes.
Tipo de documento
Artículo
Versión del documento
Versión aceptada
Lengua
English
Materias (CDU)
574 - Ecología general y biodiversidad
Páginas
43
Publicado por
Elsevier
Publicado en
Science of The Total Environment
Citación
Pérez-Burillo, Javier, Rosa Trobajo, Manel Leira, François Keck, Frédéric Rimet, Javier Sigró, and David G. Mann. 2021. "DNA Metabarcoding Reveals Differences In Distribution Patterns And Ecological Preferences Among Genetic Variants Within Some Key Freshwater Diatom Species". Science Of The Total Environment 798: 149029. doi:10.1016/j.scitotenv.2021.149029.
Número del acuerdo de la subvención
EC/COST/CA15219/EU/Developing new genetic tools for bioassessment of aquatic ecosystems in Europe/DNAqua-Net
Program
Aigües Marines i Continentals
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