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Evolution, Mass Extinctions, and Mass Speciations
Table of Contents Introduction Which Way to the New Creature? Ionizing Radiation and Evolution Geomagnetic Excursions and Evolution The Evolutionary Scenario Here, There and Everywhere -- Mass Extinctions, Mass Speciations, and Paleobiogeography Cycles of Extinction Related News Stories SEARCH OUR SITE: sitemap Return to Home Page You don't pay more, we just get a commission ...
livingcosmos.com

NERC - What caused the five past mass extinctions?
Map|Search Home About Us Funding Our Research Using NERC science Careers Publications Press Events You are here: Home > Our research > Environmental issues > Biodiversity > Earlier mass extinctions About us Funding Our research Research news Introduction Science themes Research programmes National capability Centres Responsive research Research areas International Environmental issues Climate ...
www.nerc.ac.uk

International Botanical Congress Statement on Biodiversity
WORLD'S BIODIVERSITY BECOMING EXTINCT AT LEVELS RIVALING EARTH'S PAST "MASS EXTINCTIONS": International Botanical Congress President Calls for Seven-Point Plan To Reverse Alarming Rates of ... second half of the next century, a loss that would easily equal those of past extinctions. The paper states that vast numbers of unknown plants, animals, and other organisms are currently ...
www.rbg.ca

Appalachian Mountains chapter for Conservation International book on Wilderness
European Alps, they would have been a great barrier to migrations, and a trap that would have ensured mass extinctions during ice-ages. On a different scale, the elevational gradients of gorges and summits allow short-range migrations to accomplish temperature changes that could only be achieved by migrations of hundreds of miles in the plains. ...
www.discoverlife.org

March 2, 2004: The Sixth Great Extinction
Some 208 million years ago, another mass extinction took a toll primarily on sea creatures, but also some land animals. And 65 ... ago, three quarters of all speciesincluding the dinosaurswere eliminated. Among the possible causes of these mass extinctions are volcanic eruptions, meteorites colliding with the earth, and a changing climate. After each ...
www.earth-policy.org

Mass Species extinction: A Winnowing For Tomorrows World.
This ultimate upshot will persist, so far as we can gather from recovery periods following mass extinctions in the prehistoric past, for five million years at least, probably several times longer. It behoves us, then, to appraise the ultimate repercussions of the present mass extinction on basic evolutionary processes such as natural selection and speciation. We appear to be giving it ...
www.eco-action.org

Kind Planet Environmental Info - Biodiversity - Part of Our Environmental Forum
In the 5.5 billion years of Earth's existence, there have been five mass extinctions recorded in the fossil record. These episodes all took place during the last 500 ... of biological diversity through evolutionary processes. Scientists believe we are now threatened with the greatest mass extinction in 65 million years. Even the most conservative scientific estimate of the current global ...
kindplanet.org

The Living Cosmos
Extinctions -- No Asteroid or Comet Impact Here Planetary Ejections: Cratering, Tektites, and Animal and Other Unusual Falls Evolution, Mass Extinctions and Mass Speciations The Unity of the Sun, Earth and Moon The Importance of Living Things in Our Everyday World Cycles in Natural Phenomena The Similarities of the Planets The Influences of the Earth and Planets ...
livingcosmos.com

The Pelagic Shark Research Foundation - Biology
Taxonomists and others enlessly debate the particulars. Sharks have survived at least four global mass extinctions that knocked 80% of the planets mega-- fauna into extinction. We may very well being in the midst of another major mass extinction that fire using bipedal primates (homonids) have promolgated over the past few hundred thousand years. Modern ...
www.pelagic.org

UW-ESS Research Group
It incorporates aspects of earth science along with astronomy, planetary science, oceanography, atmospheric science, microbiology, genomics and engineering. In ESS, astrobiologists study early Earth evolution, mass extinctions, remote sensing of planets, planetary interiors, and ice-covered planets. Group Website: UW Astrobiology Faculty Members: J. Michael Brown Roger Buick Eric Cheney Alan ...
www.geophys.washington.edu