منابع مشابه
Unusual Deep Water sponge assemblage in South China—Witness of the end-Ordovician mass extinction
There are few sponges known from the end-Ordovician to early-Silurian strata all over the world, and no records of sponge fossils have been found yet in China during this interval. Here we report a unique sponge assemblage spanning the interval of the end-Ordovician mass extinction from the Kaochiapien Formation (Upper Ordovician-Lower Silurian) in South China. This assemblage contains a variet...
متن کاملA 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...
متن کاملEcological disruption precedes mass extinction.
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 کاملPrimate extinction risk and historical patterns of speciation and extinction in relation to body mass.
Body mass is thought to influence diversification rates, but previous studies have produced ambiguous results. We investigated patterns of diversification across 100 trees obtained from a new Bayesian inference of primate phylogeny that sampled trees in proportion to their posterior probabilities. First, we used simulations to assess the validity of previous studies that used linear models to i...
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ژورنال
عنوان ژورنال: Conservation Biology
سال: 2008
ISSN: 0888-8892
DOI: 10.1111/j.1523-1739.1998.00023.x