Shifts in Selenium Spikes

Science - Tech - Tools



19
Jun

Shifts in Selenium Spikes

USGS scientists headed up river this June to see whether two Asian clams had also headed upstream with the drought. When there’s less fresh water flowing out to sea, salty ocean water intrudes inland, and changes the distribution of these pesky invertebrates. Potamocorbula like it saltier than Corbicula, and usually hang out in the Suisun Bay region. But scientists suspect drought conditions may have changed all that, and with it, how and when the contaminant selenium gets cycled through the estuarine food web via the clams.
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03
Mar

Keeping the Salt Field at Bay

As the dry, warm days went on and on and on this winter, two guys intimate with California’s Sacramento San Joaquin River delta shifted gears. One reassigned staff from flood to drought response, and the other lay awake at night imagining barriers across various slough openings. By early February, some Sierra reservoirs were so low, and so close to “dead pool” level, that the water projects stopped pumping and delivering. Farmers had to retrench, communities realized they might only have enough drinking water for the next six weeks, and any salmon that succeeded in spawning upstream had no water to carry them down. Things got scary. The water projects asked state regulators to let them off the hook in meeting...
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