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Rohde & Muller also argue that the fluctuations in biodiversity, especially occurring in the early part of the record, are too regularly spaced to have occurred by random chance. They conclude on the basis of a statistical argument that some unknown process influenced the waxing and waning of
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appear along the bottom. The distinctions for "all genera" and "well-resolved genera" follow Rohde & Muller (2005) and reflect either the inclusion of all of
Sepkoski's taxa or only those where the first and last appearances were well-defined in time.
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Extinction intensity during the
Phanerozoic. As changes in biodiversity reflect both changes in origination and extinction, some events shown here are masked in the biodiversity curve by very rapid replacement with new
970:– You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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It is presently a matter of scientific debate whether the long-term trend appearing here is a genuine reflection of biological changes or is instead a reflection of the biases inherent to the process of
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Sepkoski, J. (2002) A Compendium of Fossil Marine Animal Genera (eds. Jablonski, D. & Foote, M.) Bull. Am. Paleontol. no. 363 (Paleontological
Research Institution, Ithaca, NY).
829:
investigation. Some have argued that most, or all, of the large rise going into the modern day is merely a reflection of the greater availability and preservation of recent
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life with roughly a 62 million year periodicity. Periodic astronomical and geophysical processes are considered, but no particular process is definitively implicated.
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of Raup and
Sepkoski (1982) are labeled as well as a number of additional, but less well-known extinction events. Conventional symbols for the periods of
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sections. Others dispute this, and argue that most of the long-term changes reflect genuine biological processes.
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The following pages on the
English Knowledge (XXG) use this file (pages on other projects are not listed):
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Following Rohde & Muller (2005), this figure shows the apparent changes in marine
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Rohde, R.A. & Muller, R.A. (2005). "Cycles in fossil diversity".
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recorded in the
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Apparent marine fossil diversity during the
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76:. Information from its
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1710:Massa-uutstervienge
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