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Posted Mon Nov 9 2009: from Las Vegas Sun:
Quagga mussels a toxic threat to Lake Mead
...Years before they showed up in Southern Nevada, the little mollusks colonized the Great Lakes, and researchers there have found that the rise in their quagga populations correlates with increases in dangerous toxins. There are two reasons for this: poop and algae. Quaggas can poop poison pellets and can turn swaths of open lake into algae-filled dead zones. The scoop on the poop is this: Each mussel works like a tiny liver, absorbing toxins and heavy metals such as mercury, selenium, polychlorinated biphenyls (known as PCBs), and polycyclic aromatic hydrocarbons (or PAHs) from the lake water in a process called bioaccumulation. But quaggas are not content to do a good deed. They later expel those chemicals and metals -- in the form of a highly concentrated pellet. Those toxic pellets sink to the lake floor.
[Read more stories about: PCBs, contamination, heavy metals, invasive species, algal bloom, dead zones]
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'Doc Michael says:
Can we introduce some little portajohns for them?

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