bubble on surface of stagnant water

algae algal background bad band blebbing blistering bloom blooming blooms bluegreen bog bubble bubbling buckles dead deficiency diatom dirt ecology environment fermentation gas green lack marsh membrane methane miasma mud oxygen pattern phytoplankton pimpled plankton plant pollution pond popple putrefaction red rotting scarcity scum skin slime stagnant surface swamp tide water zone