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Articles 41 à 60 sur 679
Par John D. Speth, Jamie L. Clark. 2013
Recent genetic data showing that Neanderthals interbred with modern humans have made it clear that deeper insight into the behavioral…
differences between these populations will be critical to understanding the rapid spread of modern humans and the demise of the Neanderthals. This volume, which brings together scholars who have worked with faunal assemblages from Europe, the Near East, and Africa, makes an important contribution to our broader understanding of Neanderthal extinction and modern human origins through its focus on variability in human hunting behavior between 70-25,000 years ago--a critical period in the later evolution of our species.Par David J. Bottjer, Peter A. Allison. 2010
Taphonomic bias is a pervasive feature of the fossil record. A pressing concern, however, is the extent to which taphonomic…
processes have varied through the ages. It is one thing to work with a biased data set and quite another to work with a bias that has changed with time. This book includes work from both new and established researchers who are using laboratory, field and data-base techniques to characterise and quantify the temporal and spatial variation in taphonomic bias. It may not provide all the answers but it will at least shed light on the right questions.Par Hugo Marengo. 2015
This book gathers and updates the most significant advances of the last two centuries and presents an unprecedented micro paleontological…
study covering more than 20 stratigraphic sections. This information is supplemented by numerous sedimentological observations and analyses, on the basis of which a new lithostratigraphic framework for the Neogene of the Chacoparanense Basin is proposed. The book is structured in an easy-to-read format: Its main section offers a comprehensive review of the current state of knowledge on transgressions in Argentina and similar transgressions in other South American countries, taking into account various key aspects (age, paleoenvironment, micropaleontology, etc. ). Secondly, the book presents the main results on the TLP and TEP of the Chacoparanense Basin and the TEP of the Península de Valdés. Lastly, it provides readers with complete stratigraphic profiles (Appendix A), mineralogical analyses (Appendix B), distribution charts (Appendix C), systematics (Appendix D) and plates (Appendix E).Par Steve Brusatte. 2008
From the king of the dinosaurs the Tyrannosaurus Rex to the formidable Brachiosaurus, dinosaurs are a perennial favorite of children…
of all ages.The 14 stunning images in this bookazine reveal the dinosaurs as you have never seen them before. Every poster is accompanied by the facts and figures surrounding the individual dinosaurs, including information about their habitat, food and predators. Featuring a dinosaur family tree and scale pictures to help compare the size and dominance of these incredible beasts, this entertaining and educational collection will captivate and amaze.Par Joost Langeveld. 2013
Paper has never been so terrifying!Just when you thought your paper was safe! Ordinary paper springs to life with Dino-Gami,…
a new sophisticated origami kit for origami artists. Create 20 origami projects: Dimetrodon, Ankylosaurus, Parasaurolophus, Stegosaurus, Coelacanth, Ornithocheirus, Velociraptor, T. rex, Dimorphodon, Apatsaurus, Triceratops, Spinosaurus, Archaeopteryx, Seismosaurus, Archelon, Pterodactyl, Pachycephalosaurus, Brachiosaurus, a dino skeleton—and even a baby dino egg.Get to know some of your favorite Jurassic land giants in a whole new way.Great fun for the entire family.Dino-Gami offers a challenge to the next generation of art and paper crafting origami enthusiasts.Par Mark A. Loewen, Alan L. Titus. 1984
The Grand Staircase-Escalante National Monument in Utah is the location of one of the best-known terrestrial records for the late…
Cretaceous. A major effort in the new century has documented over 2,000 new vertebrate fossil sites, provided new radiometric dates, and identified five new genera of ceratopsids, two new species of hadrosaur, a probable new genus of hypsilophodontid, new pachycephalosaurs and ankylosaurs, several kinds of theropods (including a new genus of oviraptor and a new tyrannosaur), plus the most complete specimen of a Late Cretaceous therizinosaur ever collected from North America, and much more. At the Top of the Grand Staircase: The Late Cretaceous of Southern Utah documents this major stepping stone toward a synthesis of the ecology and evolution of the Late Cretaceous ecosystems of western North America.Par Lori Haskins Houran, Francisca Marquez. 2013
Rhythmical story text and illustrations follow a paleontologist and his crew as they dig, assemble, and exhibit dinosaur bones."Dig, dig,…
dig those dinosaurs/ So big, big, big those dinosaurs/ Rig, rig, rig those dinosaurs/ Dig those dinosaur bones."The rhythmical text and lively, well-researched illustrations follow a paleontologist and his crew as they find, clean, assemble, and exhibit dinosaur bones. The read-aloud fun is accompanied by up-to-date facts about dinosaur fossils. Educational and inspiring, this story is bound to captivate little scientists.This is a fixed-format ebook, which preserves the design and layout of the original print book.Par Pielou, E C. 60637
The fascinating story of how a harsh terrain that resembled modern Antarctica has been transformed gradually into the forests, grasslands,…
and wetlands we know today. "One of the best scientific books published in the last ten years. "-Ottowa Journal "A valuable new synthesis of facts and ideas about climate, geography, and life during the past 20,000 years. More important, the book conveys an intimate appreciation of the rich variety of nature through time. "-S. David Webb,SciencePar R. Dale Guthrie. 1990
Frozen mammals of the Ice Age, preserved for millennia in the tundra, have been a source of fascination and mystery…
since their first discovery over two centuries ago. The 1979 find of a frozen, extinct steppe bison in an Alaskan gold mine allowed paleontologist Dale Guthrie to undertake the first scientific excavation of an Ice Age mummy in North America and to test theories about these enigmatic frozen fauna. In this brilliant remaking of the death of a wooly bison over 36,000 years ago, we're given a glimpse of what life was like during the Pleistocene Epoch. From torn fragments and patches of deep-frozen skin and insights gleaned from studies of Montana bison, African lions, and Iberian cave art, Ice Age Forensics presents the story of the huge carcass Guthrie calls "Blue Babe"--and the excitement surrounding its reconstruction.Par Karl W Flessa, Gregory P Dietl. 2017
In conservation, perhaps no better example exists of the past informing the present than the return of the California condor…
to the Vermilion Cliffs of Arizona. Extinct in the region for nearly one hundred years, condors were successfully reintroduced starting in the 1990s in an effort informed by the fossil record—condor skeletal remains had been found in the area’s late-Pleistocene cave deposits. The potential benefits of applying such data to conservation initiatives are unquestionably great, yet integrating the relevant disciplines has proven challenging. Conservation Paleobiology gathers a remarkable array of scientists—from Jeremy B. C. Jackson to Geerat J. Vermeij—to provide an authoritative overview of how paleobiology can inform both the management of threatened species and larger conservation decisions. Studying endangered species is difficult. They are by definition rare, some exist only in captivity, and for those still in their native habitats any experimentation can potentially have a negative effect on survival. Moreover, a lack of long-term data makes it challenging to anticipate biotic responses to environmental conditions that are outside of our immediate experience. But in the fossil and prefossil records—from natural accumulations such as reefs, shell beds, and caves to human-made deposits like kitchen middens and archaeological sites—enlightening parallels to the Anthropocene can be found that might serve as a primer for present-day predicaments. Offering both deep-time and near-time perspectives and exploring a range of ecological and evolutionary dynamics and taxa from terrestrial as well as aquatic habitats, Conservation Paleobiology is a sterling demonstration of how the past can be used to manage for the future, giving new hope for the creation and implementation of successful conservation programs.Par Jennifer A. Clack. 2012
Around 370 million years ago, a distant relative of a modern lungfish began a most extraordinary adventure--emerging from the water…
and laying claim to the land. Over the next 70 million years, this tentative beachhead had developed into a worldwide colonization by ever-increasing varieties of four-limbed creatures known as tetrapods, the ancestors of all vertebrate life on land. This new edition of Jennifer A. Clack's groundbreaking book tells the complex story of their emergence and evolution. Beginning with their closest relatives, the lobe-fin fishes such as lungfishes and coelacanths, Clack defines what a tetrapod is, describes their anatomy, and explains how they are related to other vertebrates. She looks at the Devonian environment in which they evolved, describes the known and newly discovered species, and explores the order and timing of anatomical changes that occurred during the fish-to-tetrapod transition.Par David Rains Wallace. 2011
Described as "a writer in the tradition of Henry David Thoreau, John Muir, and other self-educated seers" by the San…
Francisco Chronicle, David Rains Wallace turns his attention in this new book to another distinctive corner of California--its desert, the driest and hottest environment in North America. Drawing from his frequent forays to Death Valley, Red Rock Canyon, Kelso Dunes, and other locales, Wallace illuminates the desert's intriguing flora and fauna as he explores a controversial, unresolved scientific debate about the origin and evolution of its unusual ecosystems. Eminent scientists and scholars appear throughout these pages, including maverick paleobiologist Daniel Axelrod, botanist Ledyard Stebbins, and naturalists Edmund Jaeger and Joseph Wood Krutch. Weaving together ecology, geology, natural history, and mythology in his characteristically eloquent voice, Wallace reveals that there is more to this starkly beautiful landscape than meets the eye.Par Kate Wong, Donald Johanson. 2009
"Lucy is a 3.2-million-year-old skeleton who has become the spokeswoman for human evolution. She is perhaps the best known and…
most studied fossil hominid of the twentieth century, the benchmark by which other discoveries of human ancestors are judged."-From Lucy's LegacyIn his New York Times bestseller, Lucy: The Beginnings of Humankind, renowned paleoanthropologist Donald Johanson told the incredible story of his discovery of a partial female skeleton that revolutionized the study of human origins. Lucy literally changed our understanding of our world and who we come from. Since that dramatic find in 1974, there has been heated debate and-most important-more groundbreaking discoveries that have further transformed our understanding of when and how humans evolved. In Lucy's Legacy, Johanson takes readers on a fascinating tour of the last three decades of study-the most exciting period of paleoanthropologic investigation thus far. In that time, Johanson and his colleagues have uncovered a total of 363 specimens of Australopithecus afarensis (Lucy's species, a transitional creature between apes and humans), spanning 400,000 years. As a result, we now have a unique fossil record of one branch of our family tree-that family being humanity-a tree that is believed to date back a staggering 7 million years.Focusing on dramatic new fossil finds and breakthrough advances in DNA research, Johanson provides the latest answers that post-Lucy paleoanthropologists are finding to questions such as: How did Homo sapiens evolve? When and where did our species originate? What separates hominids from the apes? What was the nature of Neandertal and modern human encounters? What mysteries about human evolution remain to be solved?Donald Johanson is a passionate guide on an extraordinary journey from the ancient landscape of Hadar, Ethiopia-where Lucy was unearthed and where many other exciting fossil discoveries have since been made-to a seaside cave in South Africa that once sheltered early members of our own species, and many other significant sites. Thirty-five years after Lucy, Johanson continues to enthusiastically probe the origins of our species and what it means to be human.From the Hardcover edition.Par Jean Guex, Federico Galster, Øyvind Hammer. 2015
The object of this book is to explain how to create a synthesis of complex biostratigraphic data, and how to…
extract from such a synthesis a relative time scale based exclusively on the fossil content of sedimentary rocks. Such a time scale can be used to attribute relative ages to isolated fossil-bearing samples. The book is composed of 10 chapters together with several appendices. It is a totally revised version of "Biochronological Correlations" published in 1991 and includes various new chapters. The book offers a solution for the theoretical problem of how fossils can be used to make reliable quantitative stratigraphic correlations in sedimentary geology. It also describes the use of highly efficient software along with several examples. The authors compare their theoretical model with 2 other relevant studies: probabilistic stratigraphy and constrained optimization (CONOP).Par Dirk-Henner Lankenau, Richard Egel, Armen Y Mulkidjanian. 2010
If theoretical physicists can seriously entertain canonical "standard models" even for the big-bang generation of the entire universe, why cannot…
life scientists reach a consensus on how life has emerged and settled on this planet? Scientists are hindered by conceptual gaps between bottom-up inferences (from early Earth geological conditions) and top-down extrapolations (from modern life forms to common ancestral states). This book challenges several widely held assumptions and argues for alternative approaches instead. Primal syntheses (literally or figuratively speaking) are called for in at least five major areas. (1) The first RNA-like molecules may have been selected by solar light as being exceptionally photostable. (2) Photosynthetically active minerals and reduced phosphorus compounds could have efficiently coupled the persistent natural energy flows to the primordial metabolism. (3) Stochastic, uncoded peptides may have kick-started an ever-tightening co-evolution of proteins and nucleic acids. (4) The living fossils from the primeval RNA World thrive within modern cells. (5) From the inherently complex protocellular associations preceding the consolidation of integral genomes, eukaryotic cell organization may have evolved more naturally than simple prokaryote-like life forms. - If this book can motivate dedicated researchers to further explore the alternative mechanisms presented, it will have served its purpose well.Par Fernando E. Novas, Federico Agnolin. 2012
Although consensus exists among researchers that birds evolved from coelurosaurian theropods paleontologists still debate the identification of the group…
of coelurosaurians that most closely approaches the common ancestor of birds The last 20 years witnessed the discovery of a wide array of avian-like theropods that has considerably amplified the anatomical disparity among deinonychosaurians some of which resemble Archaeopteryx more than Deinonychus Among these newly discovered theropods that show remarkable bird-like characteristics are the four-winged theropods Microraptor and Anchiornis and the unenlagiids Unenlagia Buitreraptor and Rahonavis A bizarre group of minute-sized coelurosaurs the Scansoriopterygidae also exhibits some avian similarities that lead some authors to interpret them as more closely related to birds than other dinosaurs With the aim to explore the phylogenetic relationships of these coelurosaurians and birds we merged recently published integrative databases resulting in significant changes in the topological distribution of taxa within Paraves We present evidence that Dromaeosauridae Microraptoria Unenlagiidae and Anchiornis Xiaotingia form successive sister taxa of Aves and that the Scansoriopterygidae are basal coelurosaurians not closely related to birds The implications in the evolutionary sequence of anatomical characters leading to birds including the origin of flight are also considered in light of this new phylogenetic hypothesisPar Mark E., Patzkowsky, Steven M. Holland. 2012
Whether the fossil record should be read at face value or whether it presents a distorted view of the history…
of life is an argument seemingly as old as many fossils themselves. In the late 1700s, Georges Cuvier argued for a literal interpretation, but in the early 1800s, Charles Lyell's gradualist view of the earth's history required a more nuanced interpretation of that same record. To this day, the tension between literal and interpretive readings lies at the heart of paleontological research, influencing the way scientists view extinction patterns and their causes, ecosystem persistence and turnover, and the pattern of morphologic change and mode of speciation. With Stratigraphic Paleobiology, Mark E. Patzkowsky and Steven M. Holland present a critical framework for assessing the fossil record, one based on a modern understanding of the principles of sediment accumulation. Patzkowsky and Holland argue that the distribution of fossil taxa in time and space is controlled not only by processes of ecology, evolution, and environmental change, but also by the stratigraphic processes that govern where and when sediment that might contain fossils is deposited and preserved. The authors explore the exciting possibilities of stratigraphic paleobiology, and along the way demonstrate its great potential to answer some of the most critical questions about the history of life: How and why do environmental niches change over time? What is the tempo and mode of evolutionary change and what processes drive this change? How has the diversity of life changed through time, and what processes control this change? And, finally, what is the tempo and mode of change in ecosystems over time?Par Martin J. S. Rudwick. 1976
"It is not often that a work can literally rewrite a person's view of a subject. And this is exactly…
what Rudwick's book should do for many paleontologists' view of the history of their own field. "—Stephen J. Gould, Paleobotany and Palynology "Rudwick has not merely written the first book-length history of palaeontology in the English language; he has written a very intelligent one. . . . His accounts of sources are rounded and organic: he treats the structure of arguments as Cuvier handled fossil bones. "—Roy S. Porter, History of SciencePar Joseph Seckbach, Alexander Altenbach. 2011
ANOXIA defines the lack of free molecular oxygen in an environment In the presence of organic matter anaerobic…
prokaryotes produce compounds such as free radicals hydrogen sulfide or methane that are typically toxic to aerobes The concomitance of suppressed respiration and presence of toxic substances suggests these habitats are inhospitable to Eukaryota Ecologists sometimes term such environments Death Zones This book presents however a collection of remarkable adaptations to anoxia observed in Eukaryotes such as protists animals plants and fungi Case studies provide evidence for controlled beneficial use of anoxia by for example modification of free radicals use of alternative electron donors for anaerobic metabolic pathways and employment of anaerobic symbionts The complex interwoven existence of oxic and anoxic conditions in space and time is also highlighted as is the idea that eukaryotic inhabitation of anoxic habitats was established early in Earth historyPar Jack Horner, James Gorman. 2009
A world-renowned paleontologist reveals groundbreaking science that trumps science fiction: how to grow a living dinosaur Over a decade after…
Jurassic Park, Jack Horner and his colleagues in molecular biology labs are in the process of building the technology to create a real dinosaur. Based on new research in evolutionary developmental biology on how a few select cells grow to create arms, legs, eyes, and brains that function together, Jack Horner takes the science a step further in a plan to "reverse evolution" and reveals the awesome, even frightening, power being acquired to recreate the prehistoric past. The key is the dinosaur's genetic code that lives on in modern birds- even chickens. From cutting-edge biology labs to field digs underneath the Montana sun, How to Build a Dinosaur explains and enlightens an awesome new science.