DISCOVERY - UNDEREATER FAIRY RINGS EXPLAINED full article
...The biologists concluded that the rings formed because of the radiating pattern in which the eelgrass grows — and dies when exposed to toxins. In the mud around the eelgrass, the scientists detected high levels of sulfide, a substance that's poisonous to eelgrass and can build up naturally in a chalky seabed like the one off Møn (or unnaturally when agricultural pollutants enter an ecosystem)...But biologists Marianne Holmer from University of Southern Denmark and Jens Borum from University of Copenhagen assure that the circles have "nothing to do with either bomb craters or landing marks for aliens."
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