Mass extinction probed
نویسندگان
چکیده
منابع مشابه
A model of mass extinction.
In the last few years a number of authors have suggested that evolution may be a so-called self-organized critical phenomenon, and that critical processes might have a significant effect on the dynamics of ecosystems. In particular it has been suggested that mass extinction may arise through a purely biotic mechanism as the result of "coevolutionary avalanches". In this paper we first explore t...
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Mass extinctions are dramatic features of the fossil record in which extinction risk is substantially elevated above background levels. Although extinction risk varies markedly over geologic time, as well as geographically, it was particularly elevated and global in extent during the so-called Big Five events: the Late Ordovician, Late Devonian, end-Permian, end-Triassic, and end-Cretaceous (1)...
متن کاملCommunity stability and selective extinction during Earth’s greatest mass extinction
We modelled the resilience and transient dynamics of terrestrial paleocommunities from the Karoo Basin, South Africa, around the Permian-Triassic mass extinction. Using recently refined biostratigraphic data that suggest two pulses of extinction leading up to the PermianTriassic boundary, we show that during times of low extinction, paleocommunities were no more stable than randomly assembled c...
متن کاملPaleophysiology and end-Permian mass extinction
Physiological research aimed at understanding current global change provides a basis for evaluating selective survivorship associated with Permo-Triassic mass extinction. Comparative physiology links paleontological and paleoenvironmental observations, supporting the hypothesis that an end-Permian trigger, most likely Siberian Trap volcanism, touched off a set of physically-linked perturbations...
متن کاملMass extinction in poorly known taxa.
Since the 1980s, many have suggested we are in the midst of a massive extinction crisis, yet only 799 (0.04%) of the 1.9 million known recent species are recorded as extinct, questioning the reality of the crisis. This low figure is due to the fact that the status of very few invertebrates, which represent the bulk of biodiversity, have been evaluated. Here we show, based on extrapolation from ...
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ژورنال
عنوان ژورنال: Nature
سال: 1998
ISSN: 0028-0836,1476-4687
DOI: 10.1038/32039