Tag: "glacial" at biology news
Back to the future: Mastodon extends the time limit on DNA sequencing
...nomic analyses have been done by almost a complete glacial
cycle. The mastodon becomes only the third extinct taxon for which the complete mitochondrial genome is known, joining the superficially similar looking woolly mammoth, and several species of Moa, the giant flightless Australasian bird. Using the m...
The origin of perennial water-ice at the South Pole of Mars
... terrains and provide strong evidence for a recent glacial
activity. However, only now a realistic explanation for the age of the deposits and the mechanism of their formation could finally be suggested. This was achieved thanks to the OMEGA mapping and characterisation of these ice deposits, combined with ...
West African Ocean sediment core links monsoons to global climate evolution
...nce of the West African monsoon at the end of each glacial
cycle. The studys importance to the modern climate, said Lea, lies in its demonstration of the sensitivity of the monsoon region to global climate conditions. With hundreds of millions of people dependent on subsistence agriculture in these region...
Oregon researchers involved in new Clovis-age impact theory
...bigger event. While generally accepted theory says glacial
melting from the North American interior caused the shift in currents, the new proposal points to a large extraterrestrial object exploding above or even into the Laurentide Ice Sheet north of the Great Lakes. "Highest concentrations of extraterres...
Jaap Sinninghe Damst awarded the Vernadsky Medal for innovative use of biomarkers
... period, conditions returned to mimicking the last glacial
and then around 10,000 years ago it became very wet. It was only around 8,000 years ago the rainfall declined and the environment settled into what it's like in the present day," explained Sinninghe Damst. He also emphasised that these findings still...
Scientists discover new life in the Antarctic deep sea
... or vice versa. The research findings suggest the glacial
cycle of advance and retreat of ice led to an intermingling of species that originated in shallow and deep water habitats. Lead author Professor Angelika Brandt from the Zoological Institute and Zoological Museum, University Hamburg says, "The An...
An ancient bathtub ring of mammoth fossils
...e Age floods in eastern Washington originated from glacial
Lake Missoula. The lake formed behind ice that dammed the Clark Fork River. Sometimes the ice dam broke, releasing huge volumesup to 500 cubic milesof water in an instant. The dam would slowly reform creating a new Lake Missoula, and the cycle would ...
A thesis of the UGR analyses more than 20-million-year-old vegetation to study climatic evolution
...sponsible for the expansion and retreat of the big glacial
layers). In addition, the scientist of the UGR [ http://www.ugr.es ] points out that another reason for the drop in temperature and the transformation of the vegetation was "the progressive raising of the European Alpine Arch during the Miocene". T...
AGU Journal Highlights -- April 16, 2007
...ure of the land surface topography in riverine and glacial
systems tends to produce fractal patterns in groundwater circulation over a wide range of spatial scales. This means that groundwater flow is influenced to some extent by the entire spectrum of surface topography, with smaller-scale features normally...
Birth rate, competition are major players in hominid extinctions
...of warm weather. Leading up to and during the last glacial
maximum about 18,000 years ago, the grassy plains disappeared, taking with them the animals that relied on large expanses of grass for grazing. These animals were the prime food source for Neandertal. At the same time, modern Homo sapiens experienc...
Antarctic warming to reduce animals at base of ecosystem, shift some penguin populations southward
...od a time 130,000 years ago before the last major glacial
stage. "We know that the climate was warmer then, ...ose two things will have great impacts on both the glacial
dynamics of the continent but also on the fragile marine and terrestrial ecosystems that have been t...
The winds of change
...this study, we found evidence that during the last glacial
period, about 14-36 thousand years ago, the prevailing wind in this zone was easterly, and marine moisture came predominantly from the East Coast." Feng explains that global climate change is often manifested by changes in general atmospheric circul...
Antarctic research within the International Polar Year IPY 2007/08
...he IPY project CliCOPEN (Impact of Climate induced glacial
melting on marine and terrestric COastal communiti...PENinsula) addresses the impact of climate induced glacial
melting on coastal species communities of the western Antarctic Peninsula. Detailed information ab...
Climate changes are linked between Greenland and the Antarctic
...urred throughout and most probably beyond the last glacial
period. "It is really astounding how systematicall...causing really dramatic climate changes during the glacial
period. It is one of our goals in our new Centre for Interglacial Climate to investigate the importa...
USGS presents a world of science at GSA in Philadelphia
...a, intense storms, seismic activity, tsunamis, and glacial
change make it one of the most active coastlines o...on issues such as arsenic and deicing chemicals in glacial
deposit aquifers; radon and uranium in the northeast and upper Midwest; salinity in the Basin and Ra...
New dwarf buffalo discovered by chance in the Philippines
...s include more than 7,000 islands. During the last glacial
maximum about 20,000 years ago, much of the water in the oceans was frozen in glaciers, resulting in much lower sea levels--about 400 feet lower. Because of this, some groups of current islands within the Philippines became connected by land. Some of...
USGS at The Wildlife Society: From sea-ice change to contaminants to predators and prey
...developed an unusual and intimate association with glacial
ice during the Pliocene and subsequent Pleistocene...ew remote sub-populations may be less dependent on glacial
environments than those found in core breeding areas. John Piatt, Session 22, Monday, Sept. 24, 3:50...
Trees appear to respond slower to climate change than previously thought
...ree refuge in Alaska during the height of the last glacial
period (17,000 to 25,000 years ago), and suggests ...lling evidence that white spruce survived the last glacial
maximum and probably some of the previous glacial
episodes in Alaska. This survival must have been f...
Climate change may threaten species of amphibians and reptiles in southwestern Europe
...ninsula as refugia against extinctions during past glacial
periods. With projected climate changes 'these hotpots of persistence might be at risk of becoming hotspots of extinction', says Dr.Miguel Arajo....
Research into salt, oil, ice and fossils
... structures, the processes affecting oil deposits, glacial
runoff, and the vision of fossil vertebrates thes...ogy, University of Basel, Switzerland Glaciers and glacial
runoff are the areas of specialisation chosen by Markus Konz. In his graduate dissertation he devise...