• Thu. Sep 24th, 2020

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Scientists discover new corals on most comprehensive deep-sea study of GBR

Australian scientists discover new corals on most comprehensive deep-sea study of GBR
In Research Vessel Falkor’s wet lab, Dr Steph McLennan – Geoscience Australia – and Jeremy Horowitz – PhD Candidate at the ARC Centre of Excellence for Coral Reef Studies at James Cook University – take photographs of samples brought up by Remotely Operated Vehicle SuBastian. Credit: Schmidt Ocean Institute

For the first time, scientists have viewed the deepest regions of the Great Barrier Reef Marine Park, discovered five undescribed species consisting of black corals and sponges, and recorded Australia’s first observation of an extremely rare fish. They also took critical habitat samples that will lead to a greater understanding of the spatial relationships between seabed features and the animals found in the Coral Sea.


The complex and scientifically challenging research was completed aboard Schmidt Ocean Institute’s research vessel Falkor, on its fourth expedition of the year, as part of the Institute’s Australia campaign. Using a remotely operated underwater robot to view high-resolution video of the bottom of the ocean floor, some 1,820 meters deep, the science team examined deep sea bathymetry, wildlife, and ecosystems. The collaborative mission brought together scientists from Geoscience Australia, James Cook University, University of Sydney, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Queensland Museum Network, and Queensland University of Technology, to answer a range of questions about the geological evolution and biology of the deep sea canyons and reefs.

“This included the most comprehensive midwater robotic dive survey series to ever have been conducted in the South Pacific,” said Dr. Brendan Brooke, the expedition’s lead scientist from Geoscience Australia. “Research vessel Falkor has integrated a range of technologies that have allowed us to work across the full range of ocean depths in the Coral Sea and to provide data for multiple disciplines including geology, biology, and oceanography.”

Australian scientists discover new corals on most comprehensive deep-sea study of GBR
This octopus was observed at nearly 1200 meters depth, during an exploration of the Ribbon Reef Canyons, around 170 km northeast of Cairns, Australia. The Remotely Operated Vehicle was exploring the mid-section of a canyon that connects directly to the shallow waters of the Great Barrier Reef, offshore from Ribbon Reef 5. The research team was using the high resolution cameras and robotic arm of the ROV to observe and collect samples of the geology and seabed organisms. Credit: Schmidt Ocean Institute

During the expedition, researchers took the deepest samples ever collected of soft coral and scleractinian coral in the Coral Sea. They also collected the first sample of ancient bedrock beneath the Great Barrier Reef, estimated to be between 40 and 50 million years old. Scientists made the first recorded observation in Australia of the extremely rare fish Rhinopias agroliba , a colorful and well-camouflaged ambush predator in the scorpionfish family. The cruise also included the most comprehensive survey of midwater jellyfish in the South Pacific.

In addition to the underwater dives, high-resolution mapping of the seafloor was conducted and covered 38,395 square kilometers, an area three times greater than Sydney. The maps include all the major coral atolls on the Queensland Plateau within the Coral Sea Marine Parkand an 80-kilometer section of canyons off the northern Great Barrier Reef Marine Park.

“These maps, samples, and images are fascinating and provide a new understanding of the geological diversity and biological wealth of a region that is already world-renowned for its natural beauty,” said Dr. Jyotika Virmani, executive director of Schmidt Ocean Institute. “The data will help marine park managers to protect these ecosystems that are so vital for our global biodiversity and human health. “

Australian scientists discover new corals in one of the most comprehensive deep sea studies of the Great Barrier Reef and Coral Sea Marine Parks. Credit: Schmidt Ocean Institute

Live streaming of the 18 underwater robotic dives via Schmidt Ocean’s channel on YouTube and 112 hours of high definition underwater video during the month-long expedition, which ended August 30, allowed the science team to share their knowledge and excitement of the voyage’s discoveries with the world. Through the livestreams, the scientists could interact directly with the public via chat and commentary.

“Schmidt Ocean Institute and the technology that it has brought to Australia is a huge enabler in better understanding our marine resources from a lens of diverse disciplines,” said Dr. Scott Nichol, one of the lead expedition scientists from Geoscience Australia. “This work brings newunderstanding and will keep the scientists busy for years.”


First completely remote at-sea science expedition in Australia’s coral sea marine park


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Schmidt Ocean Institute

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Scientists discover new corals on most comprehensive deep-sea study of GBR (2020, September 9)
retrieved 9 September 2020
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