- News Home
5 December 2013 11:26 am ,
Vol. 342 ,
Exotic, elusive, and dangerous, snakes have fascinated humankind for millennia. They can be hard to find, yet their...
Researchers have sequenced and analyzed the first two snake genomes, which represent two evolutionary extremes. The...
Snake venoms are remarkably complex mixtures that can stun or kill prey within minutes. But more and more researchers...
At age 30, Dutch biologist Freek Vonk has built up a respectable career as a snake scientist. But in his home country,...
Since arriving on the island of Guam in the 1940s, the brown tree snake ( Boiga irregularis ) has extirpated native...
An animal rights group known as the Nonhuman Rights Project filed lawsuits in three New York courts this week in an...
Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and...
Thousands of scientists in the Russian Academy of Sciences (RAS) are about to lose their jobs as a result of the...
- 5 December 2013 11:26 am , Vol. 342 , #6163
- About Us
ScienceShot: Arctic Driftwood Reveals Its Secrets
30 January 2013 1:55 pm
Massive deposits of driftwood lining Arctic shores may be an untapped trove of clues about past climate and ocean currents. Although no forests line the shoreline of the Arctic Ocean, plenty of wood ends up there after floating to sea via rivers that drain Eurasia and North America. In recent field studies conducted at two sites in eastern Greenland and one in the Norwegian archipelago of Svalbard, researchers collected 1445 samples of driftwood that had originated in distant regions. A little less than half of the samples came from cut logs (image), a sign that they had escaped from logging operations, but most of the rest—including parts of mature trees more than 50 years old—had wafted seaward after falling into rivers naturally by erosion due to strong storms or river flooding. The wood that the team analyzed came from trees of seven different genera, with conifers accounting for about 88% of the samples. About 40% of the samples came from pine species found only in Siberia, the researchers report online and in a forthcoming issue of the Journal of Geophysical Research: Biogeosciences. If the origin and age of driftwood samples can be ascertained, either by studies of tree rings or by carbon dating, then scientists might gain insights into long-term variations in river runoff and regional climate, as well as fluctuations in the strengths and paths of ocean currents. Also, by analyzing samples that had accumulated along ancient shorelines that now sit well above sea level, the scientists might be better able to estimate how quickly the landscape has risen in recent millennia after being relieved of the burden of ice sheets that melted at the end of the last ice age.
See more ScienceShots.