Die Ostsahara im Spätquartär: Ökosystemwandel im größten - download pdf or read online

By Hans-Joachim Pachur

ISBN-10: 3540204458

ISBN-13: 9783540204459

Die Ostsahara ist der gr??te hyperaride Raum der Erde. Die Forschungen zeigen, dass in den letzten ca. 13.000 Jahren ein geradezu dramatischer Klimawandel abgelaufen ist. Die Rekonstruktion der ostsaharischen Geo?kosysteme auf der foundation von geomorphologisch-pal?ohydrographischen, sedimentologischen und pal?ozoologischen Befunden f?hrt zu ?berraschenden Ergebnissen. Beispielsweise erweisen sich einige schwer zug?ngliche Syneklisen der Ostsahara w?hrend der fr?h- bis mittelholoz?nen Feuchtphase als bedeutende Wasserdampfquellen. Die Existenz von fischreichen S??wasserseen und ausgedehnten S?mpfen im Inneren des Kontinents f?hrte zu einem r?ckgekoppelten method mit niederschlagsausl?sendem Effekt und Grundwasserbildung. Pal?odrainagesysteme hoben den endorheischen prestige auf; sie bildeten Migrationsbahnen f?r ?thiopide Gro?s?uger und neolithische Ethnien. Der Widerspruch zwischen der heutigen Aridit?t und der Tatsache eines Grundwasserexports aus den gro?en Becken der Ostsahara an die nordafrikanische K?ste wird vor dem Hintergrund der geologischen und pal?oklimatischen Entwicklung diskutiert.

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Extra info for Die Ostsahara im Spätquartär: Ökosystemwandel im größten hyperariden Raum der Erde

Sample text

For 150 million years dinosaurs had been the large land animals of the planet while mammals were confined to the role of small animals. With the disappearance of the dinosaurs, there were new opportunities for mammals, and evolution rapidly AR MAG E DDON 17 produced large ones. Our nostalgia for the lost world of the Cretaceous is tempered when we realize that it was a world that held no place for us—for large mammals. Our horror at the destruction caused by the impact that ended the Cretaceous is eased by the understanding that only because of this catastrophe did evolution embark on a course which, 65 million years later, has led to us.

Most of the history of our planet is written in rocks. Rocks are the key to Earth history, because solids remember but liquids and gases forget. Retrieving these long-lost memories is the business of geologists and paleontologists, of people who have chosen to be the historians of the Earth. Understanding how we decipher a great historical event written in the book of rocks may be as interesting as the event itself. Uncovering the extinction that ended the Cretaceous has been a 18 CHAP T ER ON E saga of patient detective work, of high adventure in remote parts of the world, of lonely intellectual struggle, of long periods of frustration ended by sudden breakthroughs, of friendships made or lost, of the embarrassment of public mistakes and retractions, of the exhilaration of discovery, and of delight in a wonderful emerging story.

Evolution in this sense can be confirmed by anyone who looks carefully for and at fossils. Through the nineteenth century, names like Cretaceous and Tertiary were applied to rocks of particular age ranges as the sequence of changing fossils was gradually worked out. The reason for the changes in fossils was mysterious until English naturalists Alfred Russel Wallace and Charles Darwin explained them as the result of natural selection. As we shall see, Darwin insisted that all evolutionary change has been gradual.

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Die Ostsahara im Spätquartär: Ökosystemwandel im größten hyperariden Raum der Erde by Hans-Joachim Pachur

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