Wetland plants break down toxic algae poisons in water
Martínez I Quer A, Rueda-Carmona J, Arias CA, Ellegaard-Jensen L, Johansen A
Phytoremediation
The rushes and reeds growing at the edge of a backyard pond or local wetland aren't just scenery, they're quietly working with soil microbes to neutralize poisons that algae blooms release and that can sicken pets, livestock, and wildlife.
Algae blooms in lakes and ponds sometimes release nasty toxins that can harm animals and people who drink or swim in the water. Researchers built small test wetlands planted with rush and common reed, kept them unflooded (not sitting in standing water), and found the planted ones cleaned out the toxins far better than bare soil, likely because the plants' roots pump oxygen into the soil and feed helpful microbes. They even found several new toxin breakdown byproducts showing up more in the planted systems, suggesting the plants and their microbial partners work together in ways scientists hadn't fully documented before.
Key Findings
Planted wetlands, especially those with rush (Juncus), removed up to 97% of microcystin-LR and 90% of cylindrospermopsin toxins.
The type of base material (sand vs. gravel) made no statistically significant difference in toxin removal.
Nine toxin breakdown byproducts were identified, including five never before reported in peer-reviewed literature, and these were cleared more effectively in planted systems.
chevron_right Technical Summary
Scientists tested miniature wetlands planted with wetland rushes and reeds to see if they could clean harmful algae toxins out of contaminated water, and found that plant-filled systems removed up to 97% of one toxin and 90% of another, even without being constantly flooded.
Abstract Preview
Original paper
Unsaturated constructed wetlands for the remediation of cylindrospermopsin and microcystin-LR.
The increasing risk of cyanotoxin contamination of water resources can be mitigated using nature-based solutions. However, removal mechanisms remain insufficiently understood, particularly under un...
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Juncaceae is a family of flowering plants, commonly known as the rush family. It consists of 7 genera and about 464 known species of slow-growing, rhizomatous, herbaceous monocotyledonous plants that may superficially resemble grasses and sedges. They often grow on infertile soils in a wide range...