lowland swamp, stagnant waters

lowland swamp stagnant waters insect traps specific plants bogging paludification formation waterlogging marsh natural pollution bogginess boggingup eutrophication swamping vegetational fluctuation succession change bladderwort utricularia frogbit hydrocharis morsus ranae frogsbit green algae letch swampland flow hag ooze purgatory marshland mire bog backwater fen morass slough quagmire frog bit common vulgaris carnivorous plant flycatcher entomophagous insectivore