Laptop Battery In the deserts of the Southwest, among the towering saguaros and
the spiny cholla cactuses, rock pocket mice hop and dash in search
of a meal of seeds. But while these mice may seem to scamper
haphazardly across the desert floor, their arrangement in nature is
strikingly orderly.
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Thinkpad Nearly everywhere these mice are sandy-colored, well camouflaged
as they scurry across beige-colored outcrops. But in some areas,
ancient lava flows have left behind swaths of blackened rock. There
the same species of rock pocket mouse has only dark coats, having
evolved an entirely distinct and, for their surroundings, equally
well-disguised pelage.
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Microsoft Now, in a recent study in The Proceedings of the National
Academy of Sciences, researchers report identifying the gene
responsible for the evolution of dark coat coloration in these
mice, pinpointing the DNA sequence changes that underlie this
classic story of evolutionary change, the cute and furry
counterpart to the famous case of the peppered moth.
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Laptop Computers Researchers say the study is the first documentation of the
genetic changes underlying an adaptive change where the
evolutionary forces were natural. Scientists point out that
other well-known cases involve evolution caused by humans; some
have suggested that those changes may be atypical of
natural evolutionary change, since
they have typically involved intense, directed pressures destroying
most of a population, like the spraying of pesticides or the
application of antibiotics.
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Laptop Computer "This work is very important," said Dr. Mike Majerus, an
evolutionary geneticist at Cambridge University, who was not part
of the study. "Here man is just not involved. The sandy and lava
flow substrates are entirely natural phenomena."
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Desktop Computer Other well-studied examples of human-driven adaptive change
include the evolution of pesticide resistance in insects after
widespread spraying and the increase in the numbers of dark-winged
forms compared with light-winged
forms of the peppered moth in the United States and England
after industrialization turned air sooty and polluted.
Notebooks Dr. Michael W. Nachman, a population geneticist, along with
colleagues at the University of Arizona, Dr. Hopi E. Hoekstra and
Susan L. D'Agostino, studied mice
living on Arizona's Pinacate lava
flow in Arizona and on light-colored rocks nearby. The researchers
were able to take advantage of decades of meticulous work in which
other scientists identified some 80 genes that affected coat color
in laboratory mice.
Lenovo On close examination, the light-colored rock pocket mice could
be seen to have a type of hair coloration similar to standard,
sandy-colored laboratory mice. In this pattern, known as agouti,
the hair is black at the base, yellow in the middle and black again
at the tip. The dark-colored rock pocket mice had completely dark
hairs.
Hard Drive Researchers knew that mutations in a few well-known coat
coloration genes in laboratory mice could cause such complete
darkening of the hair, and they began by looking at two genes known
as agouti and Mc1r. When they looked at DNA sequences in light and
dark mice, changes in the agouti gene did not appear to be
associated with light-colored fur versus dark-colored. Still, the
researchers found that a certain cluster of mutations at Mc1r could
be found in every dark-colored mouse.
Travelstar "It's a textbook story," Dr. Nachman said. "Now we have all the
pieces of the puzzle together in a natural setting."
Gateway Dr. Nachman noted that while the new study points to the Mc1r
gene as the key to turning mice dark on the Pinacate lava flow, the
team also found that dark mice on another lava flow in New Mexico
did not share those mutations.
Laptop Parts "So the same dark color has evolved independently in the two
different populations," he said, "through different genetic
solutions to the same evolutionary problem." Dr. Nachman said
changes in another gene, perhaps the agouti gene, could be
responsible for dark coloration in the New Mexico's Pedro
Armendaris lava flow.
Software One could easily imagine that coloration would be of no
consequence to the rock pocket mice, as they are nocturnal, darting
about under the desert night sky. But researchers, working early in
the last century, released light and dark mice on light and dark
backgrounds in an enclosure at night and found that owls, a major
predator of mice, could easily spot a mouse on a mismatched
background.
Hard Drives Dr. Nachman noted, however, that these early researchers did not
use rock pocket mice in their study, but instead used a species in
which the dark and light forms were actually much less
distinct.
Electronics As a result, he said, "we think the owls are discriminating even
more strongly in our species." He said tiny bits of rock pocket
mouse were often found in pellets at owl roosts.
Canon Dr. Majerus said many kinds of animals showed light and dark
forms, from deer mice to squirrels and chipmunks. There are even
black ladybugs.
Desktop Pc "A lot of the dark forms show an association with a particular
type of substrate they're on, or the frequency of burning and
charring of the trees in the woodlands," he said, noting that it
would be interesting to do genetic studies in other animals, to see
how many genetic solutions these other animals have come up with to
turn dark.
Desktop Computers But while many dark forms are abundant and can be studied at
scientists' leisure, Dr. Majerus said that of the peppered moth was
slowly disappearing.
Think Pad So while there is nearly unanimous praise for the increasingly
clean air in industrialized regions of the United States and
Britain, there may be, at least for some scientists, a downside.
"We've got about 15 or 16 years," Dr. Majerus said, "before those
black forms, if they continue to disappear at the current rate,
disappear completely."
Repair By Carol Kaesuk Yoon
New York
Times - 6/17/2003
Topic: Biodiversity
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