Scientists on an Australian Antarctic Program voyage to the Denman Glacier area in East Antarctica are trialling new methods to grasp biodiversity, with out the necessity to disturb marine creatures. On board Australia’s icebreaker, RSV Nuyina, Australian Antarctic Division geneticist Dr Leonie Suter is accumulating environmental DNA (eDNA) from seawater samples in the course of …
Scientists on an Australian Antarctic Program voyage to the Denman Glacier area in East Antarctica are trialling new methods to grasp biodiversity, with out the necessity to disturb marine creatures.
On board Australia’s icebreaker, RSV Nuyina, Australian Antarctic Division geneticist Dr Leonie Suter is accumulating environmental DNA (eDNA) from seawater samples in the course of the Denman Marine Voyage, to construct an image of the biodiversity within the area.
eDNA is DNA shed by all organisms into the setting, permitting scientists to determine what organisms had been within the water across the time a pattern was taken.
“If we take a small seawater pattern, we will filter that after which sequence the DNA to inform us what’s dwelling there,” Dr Suter mentioned.
“It is a solution to do a biodiversity survey from only a small water pattern, with out ever having seen any of the animals. We will infer what’s dwelling there from the genetic traces which might be left behind, and we will try this from floor water, but in addition all through the water column all the way in which all the way down to the seafloor.”
Throughout the two-month voyage Dr Suter is accumulating five-litre floor water samples, thrice a day, via the ship’s seawater line. She can be accumulating water samples from totally different depths utilizing RSV Nuyina’s Conductivity, Temperature and Depth (CTD) instrument.
“The floor and CTD samples will give us a 3 dimensional image of biodiversity,” Dr Suter mentioned.
“And if we do that sampling repeatedly, as a part of a long-term monitoring program, we will have a look at whether or not biodiversity is altering over time, and which ocean variables are influencing group compositions.”
Key to this long-term monitoring program may very well be some new know-how Dr Suter is trialling in the course of the voyage, in collaboration with the Monterey Bay Aquarium Analysis Institute (MBARI) in California.
“We’ve got two automated eDNA samplers that can plug in to the seawater line and mechanically filter the water at pre-determined instances all through the voyage,” Dr Suter mentioned.
“Later we’ll examine the outcomes from the guide and automatic methods to see if we will use the automated system on future voyages.”
Dr Jim Birch, Director of the SURF Middle at MBARI, mentioned the Environmental Pattern Processor (ESP) and the Filtering Instrument for DNA Observations (FIDO) may accumulate 60 and 144 water samples, respectively.
“Each devices filter water and protect no matter is on the filter in a means that enables the pattern to take a seat unrefrigerated for 2 to 4 months,” Dr Birch mentioned.
“You may schedule the instrument sampling instances on a cellphone or pc they usually’re quite simple to function.”
The ESP has been used on ships, “autonomous floor craft”, and elsewhere within the northern hemisphere. Nonetheless, that is the primary time FIDO has been deployed within the discipline, and the primary time for each devices within the southern hemisphere.
“That is an engineering check for us – will these units work autonomously over 10 weeks with little or no human interplay?” Dr Birch mentioned.
“We’re actually excited to see how they carry out.”
Dr Suter mentioned she is able to “count on the surprising”.
“There are a whole lot of unknowns on this voyage,” she mentioned.
“However these instruments will assist us study extra in regards to the baseline range and describe the environments that we’re encountering within the totally different areas of the Southern Ocean.”
Dr Suter is certainly one of 60 scientists on board RSV Nuyina, spending two months utilizing the ship’s marine science capabilities to research crucial local weather questions in regards to the glacier’s accelerated soften price, elements influencing it, and the regional and world impacts.
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The Denman Marine Voyage is a collaboration between the Australian Antarctic Division, the Australian Centre for Excellence in Antarctic Science (ACEAS), the Australian Antarctic Program Partnership (AAPP) and Securing Antarctica’s Environmental Future (SAEF).
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