E-DNA in Aquatic Ecology

Identifying and monitoring species based on their physical origin is essential for understanding ecological patterns, phylogenetics, and conservation. Traditional species detection methods, particularly in aquatic and marine environments, face significant limitations due to complex life cycles, logistical challenges, and potential ecological harm. Environmental DNA (e-DNA) has emerged as an innovative, non-invasive alternative that overcomes many of these constraints. e-DNA refers to genetic material shed by organisms into the environment through tissues, secretions, or decomposition, which can be collected from samples such as water or soil. Initially applied in the 1980s to identify microbial communities, e-DNA techniques have since evolved to track diverse aquatic species and ecological changes. Its applications now extend to bio surveillance, aquaculture, biosecurity, and conservation, offering high sensitivity and specificity. The method distinguishes between particulate DNA (P-DNA) ↓ and dissolved DNA (D-DNA), enabling the detection of microscopic genetic Often likened to DNA barcoding, e-DNA detection is considered a “mini barcode” method due to its focus on short DNA sequences. This approach holds immense potential for revolutionizing species monitoring in aquatic systems.