US scientists have developed a groundbreaking method to monitor dolphin population health using environmental DNA (eDNA) from seawater samples.
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Sampling DNA in Seawater Can Reveal the Health of Dolphin Populations, in First for Conservation

EDNA Seawater Sampling Method
4 Common Dolphin Species Species studied
Santa Catalina Island, California Location
First Genetic Diversity Measure Via EDNA Breakthrough
126 water samples analyzed
15 dolphin schools studied
836 mitochondrial variants found