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Trait-based diversification shifts reflect differential extinction among fossil taxa.
Proc Natl Acad Sci U S A. 2014 Nov 18; 111(46):16419-24.PN

Abstract

Evolution provides many cases of apparent shifts in diversification associated with particular anatomical traits. Three general models connect these patterns to anatomical evolution: (i) elevated net extinction of taxa bearing particular traits, (ii) elevated net speciation of taxa bearing particular traits, and (iii) elevated evolvability expanding the range of anatomies available to some species. Trait-based diversification shifts predict elevated hierarchical stratigraphic compatibility (i.e., primitive→derived→highly derived sequences) among pairs of anatomical characters. The three specific models further predict (i) early loss of diversity for taxa retaining primitive conditions (elevated net extinction), (ii) increased diversification among later members of a clade (elevated net speciation), and (iii) increased disparity among later members in a clade (elevated evolvability). Analyses of 319 anatomical and stratigraphic datasets for fossil species and genera show that hierarchical stratigraphic compatibility exceeds the expectations of trait-independent diversification in the vast majority of cases, which was expected if trait-dependent diversification shifts are common. Excess hierarchical stratigraphic compatibility correlates with early loss of diversity for groups retaining primitive conditions rather than delayed bursts of diversity or disparity across entire clades. Cambrian clades (predominantly trilobites) alone fit null expectations well. However, it is not clear whether evolution was unusual among Cambrian taxa or only early trilobites. At least among post-Cambrian taxa, these results implicate models, such as competition and extinction selectivity/resistance, as major drivers of trait-based diversification shifts at the species and genus levels while contradicting the predictions of elevated net speciation and elevated evolvability models.

Authors+Show Affiliations

Department of Paleobiology, National Museum of Natural History, Washington, DC 20013; and wagnerpj@si.edu.Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109.

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

25331898

Citation

Wagner, Peter J., and George F. Estabrook. "Trait-based Diversification Shifts Reflect Differential Extinction Among Fossil Taxa." Proceedings of the National Academy of Sciences of the United States of America, vol. 111, no. 46, 2014, pp. 16419-24.
Wagner PJ, Estabrook GF. Trait-based diversification shifts reflect differential extinction among fossil taxa. Proc Natl Acad Sci U S A. 2014;111(46):16419-24.
Wagner, P. J., & Estabrook, G. F. (2014). Trait-based diversification shifts reflect differential extinction among fossil taxa. Proceedings of the National Academy of Sciences of the United States of America, 111(46), 16419-24. https://doi.org/10.1073/pnas.1406304111
Wagner PJ, Estabrook GF. Trait-based Diversification Shifts Reflect Differential Extinction Among Fossil Taxa. Proc Natl Acad Sci U S A. 2014 Nov 18;111(46):16419-24. PubMed PMID: 25331898.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Trait-based diversification shifts reflect differential extinction among fossil taxa. AU - Wagner,Peter J, AU - Estabrook,George F, Y1 - 2014/10/20/ PY - 2014/10/22/entrez PY - 2014/10/22/pubmed PY - 2015/4/24/medline KW - Cambrian KW - evolvability KW - extinction KW - speciation KW - trait-based diversification SP - 16419 EP - 24 JF - Proceedings of the National Academy of Sciences of the United States of America JO - Proc Natl Acad Sci U S A VL - 111 IS - 46 N2 - Evolution provides many cases of apparent shifts in diversification associated with particular anatomical traits. Three general models connect these patterns to anatomical evolution: (i) elevated net extinction of taxa bearing particular traits, (ii) elevated net speciation of taxa bearing particular traits, and (iii) elevated evolvability expanding the range of anatomies available to some species. Trait-based diversification shifts predict elevated hierarchical stratigraphic compatibility (i.e., primitive→derived→highly derived sequences) among pairs of anatomical characters. The three specific models further predict (i) early loss of diversity for taxa retaining primitive conditions (elevated net extinction), (ii) increased diversification among later members of a clade (elevated net speciation), and (iii) increased disparity among later members in a clade (elevated evolvability). Analyses of 319 anatomical and stratigraphic datasets for fossil species and genera show that hierarchical stratigraphic compatibility exceeds the expectations of trait-independent diversification in the vast majority of cases, which was expected if trait-dependent diversification shifts are common. Excess hierarchical stratigraphic compatibility correlates with early loss of diversity for groups retaining primitive conditions rather than delayed bursts of diversity or disparity across entire clades. Cambrian clades (predominantly trilobites) alone fit null expectations well. However, it is not clear whether evolution was unusual among Cambrian taxa or only early trilobites. At least among post-Cambrian taxa, these results implicate models, such as competition and extinction selectivity/resistance, as major drivers of trait-based diversification shifts at the species and genus levels while contradicting the predictions of elevated net speciation and elevated evolvability models. SN - 1091-6490 UR - https://www.unboundmedicine.com/medline/citation/25331898/Trait_based_diversification_shifts_reflect_differential_extinction_among_fossil_taxa_ L2 - http://www.pnas.org/cgi/pmidlookup?view=long&pmid=25331898 DB - PRIME DP - Unbound Medicine ER -