Correlations in fossil extinction and origination rates through geologicaltime

Citation
Jw. Kirchner et A. Weil, Correlations in fossil extinction and origination rates through geologicaltime, P ROY SOC B, 267(1450), 2000, pp. 1301-1309
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Experimental Biology
Journal title
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
ISSN journal
0962-8452 → ACNP
Volume
267
Issue
1450
Year of publication
2000
Pages
1301 - 1309
Database
ISI
SICI code
0962-8452(20000707)267:1450<1301:CIFEAO>2.0.ZU;2-O
Abstract
Recent analyses have suggested that extinction and origination rates exhibi t long-range correlations, implying that the fossil record may be controlle d by self-organized criticality or other scale-free internal dynamics of th e biosphere. Here we directly lest for correlations in the fossil record by calculating the autocorrelation of the extinction and origination rates th rough time. Our results show that extinction rates are uncorrelated beyond the average duration of a stratigraphic interval. Thus, they lack the long- range correlations predicted by the self-organized criticality hypothesis. In contrast, origination rates show strong autocorrelations due to long-ter m trends. After detrending, origination rates generally show weak positive correlations at lags of 5-10 million years (Myr) and weak negative correlat ions at lags of 10-30 Myr, consistent with aperiodic oscillations around th eir long-term trends. We hypothesize that origination rates are more correl ated than extinction rates because originations of new taxa create new ecol ogical niches and new evolutionary pathways for reaching them, thus creatin g conditions that favour further diversifications.