Competition between cryptic species explains variations in rates of lineage evolution

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doi: 10.1073/pnas.0805039105
Author(s): Alizon, Samuel; Kucera, Michal; Jansen, Vincent A. A.
Author Affiliation(s): Primary:
Queen's University, Department of Mathematics and Statistics, Kingston, ON, Canada
Eberhard Karls Universität Tübingen, Germany
Royal Holloway, University of London, United Kingdom
Volume Title: Proceedings of the National Academy of Sciences of the United States of America
Source: Proceedings of the National Academy of Sciences of the United States of America, 105(34), p.12382-12386. Publisher: National Academy of Sciences, Washington, DC, United States. ISSN: 0027-8424 CODEN: PNASA6
Note: In English. Supplemental information/data is available in the online version of this article. 41 refs.; illus.
Summary: Gradual evolution is a common phenomenon in the fossil record of marine microplankton, yet no theoretical model has so far been presented to explain the observed pattern of unidirectionality in trait evolution lasting over tens of millions of generations. Recent molecular genetic data show that the majority of microfossil-producing plankton groups harbors substantial cryptic diversity. Here, we examine the effect of cryptic diversity on apparent rates of lineage evolution. By using a theoretical approach, we show that under resource competition, an increasing number of sibling species within a hypothetical lineage leads to an exponential slowdown of the apparent rate of evolution. This mechanism explains both the remarkable variation in apparent rates of evolution observed in marine plankton, as well as the presence of long gradual evolutionary trends
Year of Publication: 2008
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 10 Paleontology, Invertebrate; 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Biodiversity; Biologic evolution; Coiling; Contusotruncana; Cretaceous; Cryptic taxa; DSDP Site 384; DSDP Site 525; Deep Sea Drilling Project; Equations; Fohsella; Foraminifera; Globigerinacea; Globigerinidae; Globoconella; IPOD; Invertebrata; Leg 43; Leg 74; Marine environment; Mesozoic; Microfossils; North Atlantic; Orbulina; Paleoecology; Plankton; Planktonic taxa; Protista; Rates; Rotaliina; Shape analysis; Shells; South Atlantic; Sphaeroidinella; Upper Cretaceous; Walvis Ridge
Coordinates: S290415 S290414 E0025908 E0025907
N402139 N402139 W0513948 W0513948
Record ID: 2011045407
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