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The Avalon explosion: evolution of Ediacara morphospace.
Science. 2008 Jan 04; 319(5859):81-4.Sci

Abstract

Ediacara fossils [575 to 542 million years ago (Ma)] represent Earth's oldest known complex macroscopic life forms, but their morphological history is poorly understood. A comprehensive quantitative analysis of these fossils indicates that the oldest Ediacara assemblage-the Avalon assemblage (575 to 565 Ma)-already encompassed the full range of Ediacara morphospace. A comparable morphospace range was occupied by the subsequent White Sea (560 to 550 Ma) and Nama (550 to 542 Ma) assemblages, although it was populated differently. In contrast, taxonomic richness increased in the White Sea assemblage and declined in the Nama assemblage. These diversity changes, occurring while morphospace range remained relatively constant, led to inverse shifts in morphological variance. The Avalon morphospace expansion mirrors the Cambrian explosion, and both events may reflect similar underlying mechanisms.

Authors+Show Affiliations

Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

18174439

Citation

Shen, Bing, et al. "The Avalon Explosion: Evolution of Ediacara Morphospace." Science (New York, N.Y.), vol. 319, no. 5859, 2008, pp. 81-4.
Shen B, Dong L, Xiao S, et al. The Avalon explosion: evolution of Ediacara morphospace. Science. 2008;319(5859):81-4.
Shen, B., Dong, L., Xiao, S., & Kowalewski, M. (2008). The Avalon explosion: evolution of Ediacara morphospace. Science (New York, N.Y.), 319(5859), 81-4. https://doi.org/10.1126/science.1150279
Shen B, et al. The Avalon Explosion: Evolution of Ediacara Morphospace. Science. 2008 Jan 4;319(5859):81-4. PubMed PMID: 18174439.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The Avalon explosion: evolution of Ediacara morphospace. AU - Shen,Bing, AU - Dong,Lin, AU - Xiao,Shuhai, AU - Kowalewski,Michal, PY - 2008/1/5/pubmed PY - 2008/1/17/medline PY - 2008/1/5/entrez SP - 81 EP - 4 JF - Science (New York, N.Y.) JO - Science VL - 319 IS - 5859 N2 - Ediacara fossils [575 to 542 million years ago (Ma)] represent Earth's oldest known complex macroscopic life forms, but their morphological history is poorly understood. A comprehensive quantitative analysis of these fossils indicates that the oldest Ediacara assemblage-the Avalon assemblage (575 to 565 Ma)-already encompassed the full range of Ediacara morphospace. A comparable morphospace range was occupied by the subsequent White Sea (560 to 550 Ma) and Nama (550 to 542 Ma) assemblages, although it was populated differently. In contrast, taxonomic richness increased in the White Sea assemblage and declined in the Nama assemblage. These diversity changes, occurring while morphospace range remained relatively constant, led to inverse shifts in morphological variance. The Avalon morphospace expansion mirrors the Cambrian explosion, and both events may reflect similar underlying mechanisms. SN - 1095-9203 UR - https://www.unboundmedicine.com/medline/citation/18174439/The_Avalon_explosion:_evolution_of_Ediacara_morphospace_ DB - PRIME DP - Unbound Medicine ER -