منابع مشابه
Pleistocene Extinctions: Haunting the Survivors
For many years, the megafaunal extinctions at the end of the Pleistocene have been assumed to have affected only those species that became extinct. However, recent analyses show that the surviving species may also have experienced losses in terms of genetic and ecological diversity.
متن کاملAssessing the causes of late Pleistocene extinctions on the continents.
One of the great debates about extinction is whether humans or climatic change caused the demise of the Pleistocene megafauna. Evidence from paleontology, climatology, archaeology, and ecology now supports the idea that humans contributed to extinction on some continents, but human hunting was not solely responsible for the pattern of extinction everywhere. Instead, evidence suggests that the i...
متن کاملLinking Top-down Forces to the Pleistocene Megafaunal Extinctions
Humans, in conjunction with natural top-down processes and through a sequence of cascading trophic interactions, may have contributed to the Pleistocene megafaunal extinctions. The arrival of the first humans, as hunters and scavengers, through top-down forcing, could have triggered a population collapse of large herbivores and their predators. We present evidence that the large mammalian herbi...
متن کاملBeringian Brown Bears Dynamics of Pleistocene Population Extinctions in
http://www.sciencemag.org/cgi/content/full/295/5563/2267 version of this article at: including high-resolution figures, can be found in the online Updated information and services, http://www.sciencemag.org/cgi/content/full/295/5563/2267/DC1 can be found at: Supporting Online Material found at: can be related to this article A list of selected additional articles on the Science Web sites http:/...
متن کاملSerial population extinctions in a small mammal indicate Late Pleistocene ecosystem instability.
The Late Pleistocene global extinction of many terrestrial mammal species has been a subject of intensive scientific study for over a century, yet the relative contributions of environmental changes and the global expansion of humans remain unresolved. A defining component of these extinctions is a bias toward large species, with the majority of small-mammal taxa apparently surviving into the p...
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ژورنال
عنوان ژورنال: Science
سال: 1976
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.191.4222.102