I had to decide if I wanted to title this post “KILLER ROBOT” or “Reef Protector”. The two different titles convey very different images, one quite provocative as a hunter/killer, and bringing to mind an endless stream of science fiction movies. I chose “Reef Protector”. It brings to mind a quest, and a hero who takes on the challenge. I had already designed the art of a killer robot but added a shield to make it less so – an assassin and a protector.
The Great Barrier Reef Foundation (GBRF) in Brisbane, Queensland, Australia, https://www.barrierreef.org/the-foundation, launched a protective program to defend the Great Barrier Reef against a voracious predator,the Crown of Thorns starfish. This predator is one of the greatest challenges facing the survival of the Great Barrier Reef. Other threats to the Great Barrier Reef include climate change, disease, changes in ocean chemistry, rising ocean waters, pollution, and physical destruction of portions of the reef by fishing gear and boat propellers. These economically valuable and beautiful reefs are threatened wherever they are.
I have not seen any part of the Great Barrier Reef, but I have dived on smaller reefs in the Philippines and in Florida where corals have created habitats for a myriad of other species. I plan on visiting the Great Barrier Reef, but this creates a challenge as well. When I get there I have to ensure that my presence and my activity does not further damage or destroy any part of this magnificent natural wonder. I say that not just as an individual wanderer, but as one of many people who visit the area. We all must ensure that tours and dives we take and services that are provided to us allow for sustainable use and protection of the Great Barrier Reef.
If the Great Barrier Reef were a single organism, it would be the largest living organism on the planet. It is of course a massive natural wonder that is made of countless individuals from a myriad of species,including many fragile and beautiful corals. However, in lore and in stories a coral reef is considered a danger which can crush the hulls of massive ships and tear small boats apart. How can a fragile thing be so dangerous and tear apart the strongest steel? The coral in the coral reef is a tiny animal. The National Oceanic and Atmospheric Administration’s (NOAA) website, https://coralreef.noaa.gov/, describes the coral animals, called polyps, as being between one and three millimeters across. That means that in the space of an inch, depending on the type of coral, between eight polyps and 25 polyps could exist. A five-inch line of type could span more than 100 polyps. The coral polyps create hard shells out of minerals in the sea water and live in closely packed colonies. When the polyps die their tiny skeletons remain behind along with those of its generation. These skeletons form the base for the following generations of corals to grow on. Over thousands of years these tiny polyps build up into massive reefs of incredible bulk and mass. It is this stony calcium carbonate base that has the mass to tear ships apart.
The Great Barrier Reef is made up of not just the uncountable individual coral polyps but of a huge number of intertwining coral reefs that have built up over the millennia. These reefs provide shelter for undersea communities that form the basis of the vast food webs of the warm tropical waters in which the majority of reefs are found. The reefs provide protection for the land on their inward side as they break the force of the ocean storms as the waves cross over the reef. In adddition, they are a living ecological community of incredible beauty.
The GBRF is working to protect the Great Barrier Reef. As part of their effort the RangerBot program was launched in 2015. Initially and provocatively described in the press, these robots were programmed to find and kill the Crown of Thorns starfish. The Crown of Thorns eats away at the corals and destroys much of the coral community. Without the living corals the other members of the undersea environment living on the reef were deprived of its benefits and either died or migrated to find other living coral reefs that could provide them with a habitat. And of course, the Crown of Thorns would be there too.
Because of nutrient runoff from farms and homes into streams that feed rivers whose waters flow out to and over the Great Barrier Reef, the population of the Crown of Thorns starfish has grown significantly. With this population growth, their capacity to destroy large portions of the Great Barrier Reef has also escalated. To fight this increasing threat the RangerBot program was launched to seek out, optically identify, and kill the Crown of Thorns starfish with a killing agent. But this is not the only capability of the RangerBot. It is described on the GBRF website as a “Swiss-Army knife” for reef protection. The RangerBot was developed by the Queensland University of Technology (QUT) as an autonomous, underwater vehicle which can provide a “ranger-like” presence in the coral reef, day and night. It is a new set of eyes and hands for reef managers. It not only can help control the Crown of Thorns, but it can also be used to monitor the health of the reef. A planned modification of the RangerBot will assist in the spread of new coral polyps. The RangerBot will collect millions of spawn from the corals. After the spawn has been raised to a larval stage in large tanks, the RangerBot will return them to the reefs and spread them in an effort to rejuvenate the damaged reefs.
Hooray for the good guys!
Scientific American has an excellent article on the RangerBot’s fight against the Crown of Thorns, https://www.scientificamerican.com/article/a-starfish-killing-artificially-intelligent-robot-is-set-to-patrol-the-great-barrier-reef/.
New Atlas has an article on the planned version of RangerBot, https://newatlas.com/larvalbot-larvae-robot-great-barrier-reef/56966/.