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Environmental DNA metabarcoding for freshwater bivalves biodiversity assessment: methods and results for the Western Palearctic (European sub-region)
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Environmental DNA metabarcoding for freshwater bivalves biodiversity assessment: methods and results for the Western Palearctic (European sub-region)
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Environmental DNA metabarcoding for freshwater bivalves biodiversity assessment: methods and results for the Western Palearctic (European sub-region)
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Journal Article
Environmental DNA metabarcoding for freshwater bivalves biodiversity assessment: methods and results for the Western Palearctic (European sub-region)
2021
Overview
Freshwater ecosystems are the most vulnerable worldwide and freshwater bivalves rank amongst the most threatened animals in the world. Surveying and monitoring freshwater bivalves are difficult tasks: they are difficult to find, hard to identify (taxonomic expertise is needed), and working underwater is technically challenging. It is therefore crucial to find more efficient methods to survey and monitor these species. Here, we present the first metabarcoding approach for freshwater bivalves and compare environmental DNA (eDNA) and traditional surveys. We describe two sets of primers (for Unionida and Venerida) developed for freshwater bivalves eDNA metabarcoding. These primers have been tested in the field, with about 300 studied sites. Results were compared to freshwater bivalves’ surveys using traditional methods, with eDNA always detecting more species than traditional surveys, especially when Sphaerids were taken into account. While our study initially focused on Western Palearctic freshwater bivalve species, our primers were confronted in silico with available sequences and have proven to be effective at a global scale. The results show that eDNA metabarcoding, with our developed primers, is a remarkable tool allowing for non-invasive surveys, detection of rare and inconspicuous species, absence data and overall freshwater bivalves routine monitoring.
