Microscopic organisms known as plankton are the most abundant life form in the ocean, yet it has been notoriously difficult to study them underwater.
That is, at least until scientists from Scripps Institution of Oceanography at the University of California San Diego developed the underwater ‘plankton’ robots. They have since used the robots to study ocean currents and the microscopic organisms they transport and helped them to answer some basic questions about plankton.
Underwater explorers
Scripps research oceanographer Jules Jaffe designed and built the miniature autonomous underwater explorers (M-AUEs), to study small-scale environmental processes taking place in the ocean. The ocean-probing instruments are equipped with temperature and other sensors to measure the surrounding ocean conditions while the robots “swim” up and down to maintain a constant depth by adjusting their buoyancy.
In a study published in the Jan. 24 issue of the journal Nature Communications, Jaffe and Scripps biological oceanographer Peter Franks deployed a swarm of 16 grapefruit-sized underwater robots programmed to mimic the underwater swimming behaviour of plankton, the microscopic organisms that drift with the ocean currents.
The research study was designed to test theories about how plankton form dense patches under the ocean surface, which often later reveal themselves at the surface as red tides – a common name for a phenomenon known as an algal bloom caused by a few species of dinoflagellates and the bloom takes on a red or brown colour.
“These patches might work like planktonic singles bars,” said Franks, who has long suspected that the dense aggregations could aid feeding, reproduction, and protection from predators.
Proving the mathematical theory
Two decades ago Franks published a mathematical theory predicting that swimming plankton would form dense patches when pushed around by internal waves—giant, slow-moving waves below the ocean surface. Testing his theory would require tracking the movements of individual plankton—each smaller than a grain of rice—as they swam in the ocean, which is not possible using available technology.
Jaffe invented robotic plankton that drift with the ocean currents, but are programmed to move up and down by adjusting their buoyancy, imitating the movements of plankton.
“The big engineering breakthroughs were to make the M-AUEs small, inexpensive, and able to be tracked continuously underwater,” says Jaffe.
The low cost allowed Jaffe and his team to build a small army of the robots that could be deployed in a swarm.
Tracking trouble
Tracking the individual M-AUEs was a challenge, as GPS does not work underwater. A key component of the project was the development by researchers at UC San Diego’s Qualcomm Institute and Department of Computer Science and Engineering of mathematical techniques to use acoustic signals to track the M-AUE vehicles while they were submerged.
During a five-hour experiment, the Scripps researchers along with UC San Diego colleagues deployed a 300m diameter swarm of 16 M-AUEs programmed to stay 10m deep in the ocean off the coast of Torrey Pines, near La Jolla, California. The M-AUEs constantly adjusted their buoyancy to move vertically against the currents created by the internal waves. The 3D location information collected every 12 seconds revealed where the robotic swarm moved below the ocean surface.
The results of the study were nearly identical to Franks’ mathematical prediction. The surrounding ocean temperatures fluctuated as the internal waves passed through the M-AUE swarm. And, as predicted, the M-AUE location data showed that the swarm formed a tightly packed patch in the warm waters of the internal wave troughs, but dispersed over the wave crests.
“This is the first time such a mechanism has been tested underwater,” says Franks.
A new realm
The experiment helped the researchers confirm that free-floating plankton can use the physical dynamics of the ocean—in this case internal waves—to increase their concentrations to congregate into swarms to fulfil their fundamental life needs.
“This swarm-sensing approach opens up a whole new realm of ocean exploration,” says Jaffe. Augmenting the M-AUEs with cameras would allow the photographic mapping of coral habitats, or what Jaffe calls “plankton selfies”.
The research team has hopes to build hundreds more of the miniature robots to study the movement of larvae between marine protected areas, monitor harmful red tide blooms, and to help track oil spills. The M-AUEs could potentially be deployed in swarms of hundreds to thousands to capture a 3D view of the interactions between ocean currents and marine life.
The on-board hydrophones that help track the M-AUEs underwater could also allow the swarm to act like a giant ear in the ocean, listening to and localising ambient sounds in the ocean.
Hopefully the robotic plankton will continue to confirm theories about ocean life and reveal new ones.