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USGS science for a changing world logo
January 2, 2001

Nitrous oxide is an important atmospheric trace gas that contributes to the greenhouse effect and the destruction of ozone. Researchers hypothesize that one important source of atmospheric nitrous oxide is ground water, yet few studies have tested this hypothesis.

USGS science for a changing world logo
December 21, 2000

DNA sequence data revealed a deep genetic split between common ravens from the southwest United States compared to the rest of the world, according to a journal article in the December 22 issue of the Proceedings of the Royal Society of London, Biological Sciences.

USGS science for a changing world logo
December 19, 2000

The effects of selenium entering the San Francisco Bay-Delta Estuary (Bay-Delta) are forecast in a model released today by the U.S. Geological Survey (USGS). 

USGS science for a changing world logo
December 18, 2000

Originating along riverbanks in Brazil a plant called Christmasberry, or Brazilian peppertree, is used to deck halls and homes in this holiday time of year. Earlier this month, Christmasberry was even offered for sale at a "swap-meet" in Kahului, Maui, Hawaii, where it was labeled "Maui mistletoe."

USGS science for a changing world logo
December 7, 2000

Neither a tree-dweller nor a night bird, and roughly the size of a chicken, the Gunnison sage-grouse is not a particularly secretive bird yet just recently has it been identified as a new species of bird. 

USGS science for a changing world logo
December 7, 2000

A minor earthquake, preliminary magnitude 3.9 according to the U.S. Geological Survey, occurred about 5 miles west of Evansville, Indiana at 8:08 am local time (Central Standard Time). The earthquake was felt in parts of southern Indiana and western Kentucky. The USGS has received no reports of damage at this time.

USGS science for a changing world logo
December 7, 2000

Scientists have confirmed that agricultural contaminants may be an important factor in amphibian declines in California.