Skip to comments.Debate Heats Up On Role Of Climate In Human Evolution
Posted on 11/03/2003 7:52:15 PM PST by blam
Contact: Ann Cairns
Geological Society of America
Debate heats up on role of climate in human evolution
Boulder, Colo.- Scientists at the Geological Society of America annual meeting in Seattle next week are taking a comprehensive new look at drivers of human evolution. It now appears that climate variability during the Plio-Pleistocene (approximately 6 million years in duration) played a hugely important role. Astronomically controlled climate forcing on scales ranging from 20,000 to 100,000 years down to El Niños (5-7 years) made a highly unpredictable environment in which generalists with intelligence, language, and creativity were best able to adapt. Traditional studies of human evolution have focused largely on finding and dating hominid fossils. Today the investigation is rapidly expanding with advances in DNA research and understanding of global climate change. The combination of archeological, geologic, and paleoclimatic evidence allows scientists to explore such tantalizing questions as:
What were the drivers that may have nudged hominids toward bi-pedalism? Why did only one species ultimately succeed at it? How might global climate change have influenced brain development, development of tools, and the exodus from Africa? How did glacial periods in Europe, Asia, and North America impact humans? "The answers to these questions will not all come from the bones, but from what was taking place in the environment in which they were found," says Gail Ashley, Dept. of Geological Sciences, Rutgers University.
Ashley and Craig Feibel of Rutgers have assembled an interdisciplinary group of distinguished scientists physical anthropologists, archaeologists, geologists, and paleoclimatologists for a Pardee Keynote Symposia, The Paleoenvironmental and Paleoclimatic Framework of Human Evolution. The symposium takes place at GSA on Monday, Nov. 3.
William Ruddiman, celebrated author of Earth's Climate: Past and Future, provides an overview of climate change over the last several million years, helping to separate fact from fiction.
Bernard Wood, a world-renowned physical anthropologist, discusses the hominin family "Tree of Life" and the challenges of working with the meager fossil record of human evolution spanning the last 7 million years.
Thure Cerling is a pioneer in using isotope records of bones and teeth. With co-authors Meave Leakey and John Harris he provides a comprehensive look at the impact of climate change on the biological record from one of richest fossil sites in the world (Lake Tukana, Kenya).
Jonathan Wynn unravels some of the paleoclimate puzzles from fossil soils at key sites in the "Cradle of Mankind" in East Africa. The soils provide clear documentation of extremely arid events. Prolonged droughts may have been a factor in triggering migrations of hominins out of Africa.
Julia Lee-Thorpe, a trail blazing geochemist, has taken a more personal approach to human evolution by examining hominin nutrition through analyses of tooth enamel. Diet is a direct record of available food resources and an indirect record of the environment in which the individual lived.
Andrew Hill, a globally recognized expert on the paleontological record in East Africa, reports on the latest findings from the superb paleoenvironmental record of the Tugen Hills, Kenya (site of the discovery of the 6 million-year-old "Millennium Man").
Gail Ashley speculates on the critical role of the availability of water in affecting human evolution, based on studies from Olduvai Gorge and other fossil localities. Dramatic fluctuations in climate (wet to dry) in East Africa may have been an important factor in affecting natural selection of species able to cope through arid periods.
David Lordkipanidze and Reid Ferring tell an exciting chapter on the "Out-of-Africa" story from Dmanisi, Republic of Georgia. The 1.8 million-year-old hominin remains are the first discoveries outside Africa to show clear affinities to early African Homo.
Rick Potts, author of the provocative book Humanity's Descent: The Consequences of Ecological Instability, contributes important new findings from China revealing the successful adaption of some hominin groups 400,000 years ago to climatic fluctuations and drastic environmental change.
James Dixon, a recognized authority on peopling of the Americas, provides the most recent chapter in the record of humans. Continental ice sheets, sea level changes and the presence of the Bering land bridge effectively controlled immigration from Asia to the New World.
Craig Feibel provides perspective on the physical environmental constraints in which human evolution took place. He examines the role of geologic factors such as plate tectonics, sea level change, and climate fluctuations in affecting selective pressure on hominins and thereby impacting how and where humans evolved. The Paleoenvironmental and Paleoclimatic Framework of Human Evolution Monday, Nov. 3, 8:00 a.m.-12:00 p.m., WSCTC Ballroom 6B
During the GSA Annual Meeting, Nov. 2-5, contact Ann Cairns at the GSA Newsroom, Washington State Convention Center and Trade Center, Seattle, for assistance and to arrange for interviews: 206-219-4615.
Geological Society of America 115th Annual Meeting Nov. 2-5, 2003 Washington State Convention and Trade Center Seattle, WA, USA
Geological Society of America www.geosociety.org
Yes it could. Which group do I ping? Both?
I agree. I think the cold taught us how to plan and have a concept of the future. Those who didn't plan when things were good(warm), didn't survive when things were bad(cold).
Gods, Graves, Glyphs
List for articles regarding early civilizations , life of all forms, - dinosaurs - etc.
Let me know if you wish to be added or removed from either list.
I don't get offended if you want to be removed.
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Keep that up and we'll make an anthropologist outta you.
Evolution is not science, it is the ignorant religion of the God haters. Objective science proves that creation is undeniable fact.
Nah, that's archaeology. Anthropologists mostly think about what archaeologists find.
My mother used to sing that song to me when I was young.
Evolution is science. Biologists refer to human evolution frequently. Christians who understand biology don't have a problem with this theory.
It is those folks who demand that science be curtailed are the God-haters. I know you don't have a dinosaur in your basement, or are in possession of a 12 billion year-old human fossil.
However, I agree that creation is a fact.
Or, you planned and lived with it. The cold is also why we have white people...vitamin 'D' and all.
I have edited your post for clarity.