575:) and oxygen-18 (δ18O) isotopes and comparing them to the ones in the drinking water. The extent of the information that can be deduced depends on the length of the hair: the longer is the hair, the greater is the extraction of information. The variation with geography of isotope concentrations is linked with precipitations, cloud temperatures and with the amount of water that evaporates from soil and plants. When clouds move off the ocean towards inland the ratios of oxygen-18 to oxygen-16 and hydrogen-2 to hydrogen-1 tend to decrease because of the rain water with oxygen-18 and hydrogen-2, being heavier, tends to fall first. Samples of tap water were collected from more than 600 cities across the United States as well as hair samples from the barbershops in 65 cities in 20 states. The comparison showed that both hair and drinking water samples had the same isotopic variations. In order to display these information, the scientists produced color-coded maps based on the correlation of the isotopes in hair to those in drinking water. This maps show how ratios of hydrogen and oxygen isotopes in scalp hair vary in different areas of the United States. It was so proved that the water drank by a human being leaves in the hair an evidence which contain oxygen and hydrogen isotopes equal to the ones in the tap water. This technique would have been a new tool for policemen, anthropologists, archaeologists and doctors.
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571:" with the title "Hydrogen and oxygen isotope ratios in human hair are related to geography". To know where people have been and where they lived for a while are information that became available by analyzing the stable isotope composition of their scalp hair. Cerling discovered that a strand of hair could provide valuable clues about a person's travels by studying the variation of hydrogen-2 (
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the cycle could restart. The research also pointed out how developed is the competition between elephants and cattle: during the typical wet season diet of elephants, the overgrazing by cattle caused the grass to be very short, resulting in a limited access to it for elephants, out-competing them. This situation could have influenced the elephants' ability to bulk up for pregnancy.
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life, the elephants were equipped with a Global
Positioning System that recorded their positions every hour for the whole research period. For getting the sample of tail hair, elephants were immobilized with drug-filled dart guns when necessary. Considering that the hair grows about an inch per month, a single hair contained isotopic information to diet during an 18-month period.
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567:, a biology professor at the University of Utah, founded Isoforensics in 2003, a company with the aim of interpreting the stable isotope composition of various biological and synthetic materials. This was the first step for the discovery they made which was first published on February 25, 2008, by the "
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For what concern the
Samburu-Buffalo Springs, five weeks after the rainy season had started, the grass became rich in nutrients and the females were most likely to conceive, giving birth 22 months later, just in time for another rainy season to provide nutrients to the grass they would have eaten:
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national reserves in northern Kenya analyzing carbon and other stable isotopes in elephant tail hair to discover where and what
Victoria, Anastasia and Cleopatra, three daughters of a mother elephant named Queen Elizabeth, usually eat over a six-years period (2000–2006). In order to monitor their
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The analysis of ratios of carbon-13 to carbon-12 along the length of a single elephant hair led
Cerling and his crew to understand the elephants' diet. During the wet season, after the grass had grown long enough for elephants to grab with their trunks, their tail hair showed the presence of
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Current research work includes a focus on the development of landforms in semi-arid regions, the geology of Old World paleo-anthropologic sites and on contaminant migration in surface and ground waters, including the use of tritium and helium as hydrological tracers.
534:, made relevant studies relatively to carbon isotopes. Thanks to a deep analysis of palaeovegetation from palaeosols and palaeodiet measured in fossil tooth enamel, was demonstrated a global increase in the biomass of plants using C
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biomass. The publication "Global vegetation change through the
Miocene/Pliocene boundary" in 1997 confirmed these results, demonstrating even how at lower latitudes the change appeared to occur earlier because of the threshold for
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different form of carbon, indicating a high amount of high-protein grass. On the other hand, during the dry season, the results obtained by the analysis of the hair pointed out how elephants had switched over to shrubs and trees.
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421:. Cerling is a leading expert in the evolution of modern landscapes including modern mammals and their associated grassland ecologies and stable isotope analyses of the atmosphere. Cerling lives in Salt Lake City, Utah.
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All these analyses pointed out even that there are some elephant families friendlier than others and showed how there are dominant families that settle down in the best places, where there is plenty of food and water.
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Emphasizing continental ecologies of lakes and modern soils and ecosystems, Cerling has written extensievely about the evolution of ecosystems, the inception and strengthening of
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Cerling, T. E.; Wittemyer, G.; Rasmussen, H. B.; Vollrath, F.; Cerling, C. E.; Robinson, T. J.; Douglas-Hamilton, I. (2006).
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Cerling; Iain Douglas-Hamilton; Lee Siegel: "Elephant Tracks" University of Utah News Release, January 2, 2006.
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Cerling, T. E.; Harris, J. M.; MacFadden, B. J.; Leakey, M. G.; Quade, J.; Eisenmann, V.; Ehleringer, J. R. (1997).
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ecosystems as an indicator of global ecological change in the late
Miocene" in 1993, Cerling, helped by
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Ehleringer, J. R.; Bowen, G. J.; Chesson, L. A.; West, A. G.; Podlesak, D. W.; Cerling, T. E. (2008).
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as well as studying dietary changes of different mammalian lineages extending over millions of years.
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www.scientificblogging.com Crime fighting tool hair reveals where murder victims drank water
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processes and on the geological record of ecological change. Particularly, working on
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processes across a broad spectrum of ecological and environmental applications".
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It may require cleanup to comply with
Knowledge's content policies, particularly
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of
Colorado State University and member of "Save the Elephants" in Nairobi, and
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photosynthesis between 7 and 5 million years ago. The decrease of atmospheric CO
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Proceedings of the
National Academy of Sciences of the United States of America
788:"Stable isotopes in elephant hair document migration patterns and diet changes"
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in geology from Iowa State. In 1977 he was awarded a Ph.D. in geology from the
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ecosystems as an indicator of global ecological change in the late Miocene"
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concentrations over the history below a threshold that favored the C
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Cerling's research interests are primarily focused on Earth surface
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Fellows of the American Association for the Advancement of Science
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466:, he established the Stable Isotope Biogeochemistry and Ecology (
920:(35). Proceedings of the National Academy of Sciences: 15326–8.
691:"Global vegetation change through the Miocene/Pliocene boundary"
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from the article and its talk page, especially if potentially
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Members of the United States National Academy of Sciences
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A major contributor to this article appears to have a
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Cerling, T. E.; Harris, J. M.; Leakey, M. G. (1999).
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The elephant tail hair: how many things they can say!
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Give me a hair and I'll tell you where you have been
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583:Professor Cerling, helped by James Ehleringer and
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555:photosynthesis is higher at warmer temperatures.
417:and a Distinguished Professor of Biology at the
973:Proceedings of the National Academy of Sciences
792:Proceedings of the National Academy of Sciences
739:Proceedings of the National Academy of Sciences
569:Proceedings of the National Academy of Sciences
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641:Cerling, T. E.; Wang, Y.; Quade, J. (1993).
510:and, from 1979 he has been a member of the
64:Learn how and when to remove these messages
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178:Learn how and when to remove this message
116:Learn how and when to remove this message
608:Wet and dry seasons: different responses
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522:With the publication of "Expansion of C
1060:Chemistry World - News - 2008 February
351:Geological record of ecological change
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587:(two University of Utah colleagues),
490:degree in geology and chemistry from
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1115:Oak Ridge National Laboratory people
504:University of California at Berkeley
1030:"Member Citation, Thure E. Cerling"
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349:Modern animal diet and physiology
45:This article has multiple issues.
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158:has been specified. Please help
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96:. Please discuss further on the
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53:or discuss these issues on the
27:American geochemist (born 1949)
1032:. National Academy of Sciences
486:Thure E. Cerling received his
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969:"Profile of Thure E. Cerling"
910:"Profile of Thure E. Cerling"
508:Oak Ridge National Laboratory
498:, in 1972, and, in 1973, his
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361:National Academy of Sciences
205:biography of a living person
232:must be removed immediately
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967:Downey, P. (August 2010).
518:Global ecological changes
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994:10.1073/pnas.1010204107
935:10.1073/pnas.1010204107
908:Downey, Philip (2010).
813:10.1073/pnas.0509606102
760:10.1073/pnas.0712228105
635:Publications by Cerling
470:) summer course at the
219:Please help by adding
868:10.1007/s004420050869
593:Iain Douglas-Hamilton
492:Iowa State University
476:isotope fractionation
94:neutral point of view
438:conservation biology
225:Contentious material
160:improve this article
148:to meet Knowledge's
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979:(35): 15326–15328.
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488:Bachelor of Science
585:Christopher Remien
563:Thure Cerling and
512:University of Utah
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428:– Thure E. Cerling
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