Extinctions and Biodiversity in the Fossil Record
نویسندگان
چکیده
Volume 2, The Earth system: biological and ecological dimensions of global environmental change, pp 297–301
منابع مشابه
An ubiquitous ~62 Myr periodic fluctuation superimposed on general trends in fossil biodiversity
A 62 Myr periodicity is superimposed on other longer-term trends in fossil biodiversity. This cycle can be discerned in marine data based on the Sepkoski compendium, the Paleobiology Database, and the Fossil Record 2. The signal also exists in changes in sea level/sediment, but is much weaker than in biodiversity itself. A significant excess of 19 previously identified Phanerozoic mass extincti...
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The fossil record amply shows that the spatial fabric of extinction has profoundly shaped the biosphere; this spatial dimension provides a powerful context for integration of paleontological and neontological approaches. Mass extinctions evidently alter extinction selectivity, with many factors losing effectiveness except for a positive relation between survivorship and geographic range at the ...
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We find that the marine 87 Sr/ 86 Sr record shows a significant periodicity of 59.3 ± 3 Myr. The 87 Sr/ 86 Sr record is 171° ± 12°out of phase with a 62 (± 3) Myr periodicity previously reported in the record of marine-animal diversity. These periodicities are close to 58 (± 4) Myr cycles found for the number of gap-bounded sedimentary carbonate packages of North America We propose that these p...
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Unsurprisingly, humans are increasingly concerned about their possible impact on climate change and its wider effects on the environment. But climate is well known to have varied in the past, so what has been the impact of these variations on the species of the time? Most attempts to look at this issue have focused on relatively short geological periods, limited geographical ranges or few taxon...
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Plants have a long evolutionary history, during which mass extinction events dramatically affected Earth's ecosystems and its biodiversity. The fossil record can shed light on the diversification dynamics of plant life and reveal how changes in the origination-extinction balance have contributed to shaping the current flora. We use a novel Bayesian approach to estimate origination and extinctio...
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تاریخ انتشار 2001