Genetic traces reveal river residents: 1,072 species in a bucket of water
Can DNA traces in just two liters (0.5 gallons) of water reveal how a river's biodiversity changes over the course of a year? A study by the University of Duisburg-Essen using the River Lippe as an example shows how biodiversity in freshwater ecosystems can be monitored comprehensively, efficiently and at comparatively low cost. The results have now been published in the journal Ecological…
Scientists from the University of Duisburg-Essen have discovered that just two liters of water from a river can reveal the biodiversity of an entire river system. Over the course of a year, the researchers collected 52 water samples from the River Lippe, using a technique called DNA metabarcoding to identify species from genetic traces left in the water.
They found evidence of 1,072 different species, including fish, birds, mammals, invertebrates, and diatoms. This method of monitoring biodiversity is much more cost-effective than traditional methods, which require physically capturing individual organisms. The study found that eDNA monitoring can provide valuable insights into the biology of the river, with seasonal patterns in DNA reflecting species-specific biological processes.
While eDNA monitoring cannot quantify biomass or abundance, combining it with conventional methods could provide a more complete picture of river health.
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