Pond's surface looks green? It might be covered with duckweed, not algae
It is a common mistake for folks to think shallow ponds are green because algae is covering the surface of the water.
Some duckweed species have no tiny rootlets, while others have more. Based on the number of rootlets we have on our duckweed at Stillman Nature Center, it is greater duckweed, a classic oxymoron if there ever was one. What about insects that require water to procreate, such as the omnipresent mosquito? It's hard for a female mosquito to lay her eggs in the required water if the best she can do is crawl across an uninterrupted coating of duckweed plants.
Since water gardening is something of an industry, there is a lot of information available on the nutritional value of duckweed. For example, duckweed provides essential vitamins and minerals for fish. The fancy college word is bioremediation. In other words, species of duckweed are being used, around the world, to filter out pollutants from water reservoirs and other waterways. These hardworking tiny plants restore the quality of the water they are floating on top of.
Third, serve yourself. In some Asian cultures, duckweed is used as human food. Overseas, an alternative name for duckweed is water lentils. By September, we could make a giant vat of"lentil soup" with the pond water here at Stillman Nature Center.
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