Have you — like many — been dumbfounded by the mysterious underwater “fairy circles” found in the Mediterranean and Baltic sea? If so, you’re not alone. Fortunately, scientists finally know what is causing the sea floor phenomena, though it’s not likely to cheer you up. It turns out the “bald patches” devoid of vegetation are actually caused by a foreign species which may put entire ecosystems at risk.
In the paper “Fairy Circle Landscapes Under The Sea,” published by Science Advances, lead researcher Daniel Ruiz-Reynés wrote that the invading species are being driven into the areas by polluted waters and climate change: “The spatial organisation of vegetation landscapes is a key factor in the assessment of ecosystem health and functioning,” he wrote, adding, “Spatial configurations of vegetation landscapes act as potential indicators of climatic or human forcing affecting the ecosystem.”
The scientific name for the seagrass is Posidonia oceanica, and its dwindling presence signals that the region it is located in is threatened. If large populations of the seagrass disappear, the planet’s larger ecosystem will be affected, the researchers concluded.
Unfortunately, it appears the circles, which have been found around the Danish coast as well as the Balearic islands, are more prevalent than scientists realized. This is because they are located below water. “Satellite images and side-scan cartography reveals that complex seascapes are abundant in meadows of Posidonia oceanica, suggesting that self-organised submarine vegetation patterns may be prevalent but have remained thus far largely hidden under the sea,” wrote Ruiz-Reynés. Furthermore, because the seagrass has a very low growth rate, losses are “essentially irreversible.”
Using findings from previous studies and by creating a mathematical model based on seagrass growth rates and long-distance interaction between underwater plants, the team was able to determine the cause of the fairy circles. Long story short, the competition for resources changes the dynamics of seagrass growth and is largely propelled by both climate change and pollution.
This discovery is both intriguing and frightening, considering enough plastic is thrown away each year to circle the globe four times — and of that amount, 80 percent makes its way into the oceans. If humans collectively fail to curb carbon emissions and only haphazardly invest in sustainable initiatives, the effects of climate change will result in much of the planet becoming uninhabitable, as well as various species going extinct.
Via The Daily Mail