In a rare piece of environmental good news, the invasive shrimp that had upset the ecosystem are almost gone.
To study the dramatic restructuring of Lake Tahoe’s food web, the Center’s research vessel counts the presence of three different populations: algae; the predatory shrimp, calledBosmina,In the past, the nighttime netting would capture 100 to 150 of the nocturnal shrimp, which rise to the surface of the lake in darkness.The lab is also monitoring lake clarity by measuring the depth to which a 10-inch white plate, called a Secchi disk, remains visible when lowered into the water.
The mountain-ringed lake, which straddles the Nevada/California border in the Sierra Nevada, has long been considered a natural wonder. Awed by its crystalline waters, writer Mark Twain proclaimed it “so singularly clear…that the boat seemed floating in the air. The water was not merely transparent, but dazzlingly, brilliantly so.” The lake owes its clarity to surrounding granite. Additionally, it has a relatively small watershed and is largely free of agricultural pollutants.
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