Leaf Litter
Raking in Notes From All Over
More
July, 1998
Grazing In the Grass
The National Science Foundation reports that grazing animals may play
a role in preserving biodiversity among grasses. After a 10-year study
of Kansas prairies, scientists suggest that regular mowing or grazing
allows sunlight to reach the ground, causing more grass species to
thrive.
Good News on Biodiversity
A study by the United States and Canadian branches of the World
Wildlife Fund suggests that North America harbors a far more critical
share of the world's biodiversity than has been generally recognized,
with over 30 of its 116 bioregions ranked as globally outstanding.
A Stinky Problem
According to the US Environmental Protection Agency, America's cattle,
hog and poultry farms generate 1.37 billion tons of manure a year.
That's 100 times what the human population produces and amounts to 5
tons of animal waste for every person. The manure has become an
ecological threat.
Down in the Valley
The
US Geological Survey calls the San Joaquin Valley's well water worse
than half the water tested nationwide. The San Joaquin River is also
polluted. Farm drainage and pesticides are the cause, according to the
federal study.
Mixed Blessing
Vegetation and trees, such as eucalyptus, emit oil-based hydrocarbons
to protect themselves from the sun's heat and destructive insects.
They have been identified as Ventura County's second-worse producer of
this essential ingredient of smogin addition to oxygen,
essential to life.
Vampire Plant
The
Ventura Marsh Milkvetch, thought to be extinct for 30 years, made a
reappearance in oil-polluted sand dunes near the City of Oxnard. The
discovery came as a result of an environmental impact study and will
possibly affect building plans for a subdivision of homes and an
artificial lake.
Doctor Lizard
A UC
Berkeley insect biologist has found a substance in the blood of the
Western fence lizard that kills Lyme disease bacteria in ticks that
feed on it. Lyme disease is prevalent on the US east coast, which is
not host to the lizard. There, the disease is carried by infected deer
ticks.
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