Antarctic scientists have trialed a DNA ‘barcoding’ technique that could improve biosecurity measures that help protect polar ecosystems from invasive marine species.The research, led by Australian Antarctic Program scientists, used environmental DNA
Antarctic scientists have trialed a DNA ‘barcoding’ technique that could improve biosecurity measures that help protect polar ecosystems from invasive marine species.
The research, led by Australian Antarctic Program scientists, used environmental DNA (eDNA) in water samples, to detect species known to hitch-hike on ships’ hulls.
The work was conducted during a voyage from Tasmania to sub-Antarctic Macquarie Island, on MPOV Aiviq in 2022.
Molecular biologist Dr Leonie Suter said the research showed that eDNA sampling could help ensure effective biosecurity practices (such as hull cleaning), and identify invasive species before they can establish.
“eDNA is DNA shed by all organisms into the environment,” Suter said. “By collecting environmental samples, such as soil or water, we can analyse this DNA and identify what organisms are present.
“Our research showed that eDNA monitoring could validate and inform the ongoing effectiveness of biofouling management measures to protect sub-Antarctic and Antarctic marine environments.”
To collect the eDNA samples, the team used small sponges contained inside perforated plastic balls, to absorb seawater containing eDNA.
Prior to the voyage, eDNA samples were collected in seawater alongside the ship in the port of Hobart, before, during and after hull cleaning.
Divers also visually inspected the hull to
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