Abstract:
:For taxonomic levels higher than species, the abundance distributions of the number of subtaxa per taxon tend to approximate power laws but often show strong deviations from such laws. Previously, these deviations were attributed to finite-time effects in a continuous-time branching process at the generic level. Instead, we describe herein a simple discrete branching process that generates the observed distributions and find that the distribution's deviation from power law form is not caused by disequilibration, but rather that it is time independent and determined by the evolutionary properties of the taxa of interest. Our model predicts-with no free parameters-the rank-frequency distribution of the number of families in fossil marine animal orders obtained from the fossil record. We find that near power law distributions are statistically almost inevitable for taxa higher than species. The branching model also sheds light on species-abundance patterns, as well as on links between evolutionary processes, self-organized criticality, and fractals.
journal_name
Proc Natl Acad Sci U S Aauthors
Chu J,Adami Cdoi
10.1073/pnas.96.26.15017keywords:
subject
Has Abstractpub_date
1999-12-21 00:00:00pages
15017-9issue
26eissn
0027-8424issn
1091-6490journal_volume
96pub_type
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