Evolutionary Ecology

, Volume 26, Issue 2, pp 417–433 | Cite as

Ecological drivers of the Ediacaran-Cambrian diversification of Metazoa

  • Douglas H. ErwinEmail author
  • Sarah Tweedt
Original Paper


Organismal modifications to their physical and chemical environment play a significant role in structuring many modern ecosystems, and experimental evidence suggests that such behavior can increase diversity. Despite the important role such activities play in connecting ecology and evolution, less is known of the macroevolutionary impact of such influences, especially their role during major evolutionary transitions. The Ediacaran-Cambrian diversification of Metazoa encompassed the appearance and early diversification of virtually all major clades of marine animals and the establishment of metazoan-dominated ecosystems. Here we assess the role of positive ecological feedbacks using a new compilation of the first occurrences of all metazoan phyla, classes; orders and equivalent stem taxa, as well as data from a previously published compendium on fossils from the early to middle Cambrian of China. The results reveal relatively minor feedback during the Ediacaran, but a substantial increase during the Cambrian, principally through bioturbation and the appearance of a number of structural engineers, including sponges. Chemical modification of the environment through filtering and bioturbation seems to have had the largest impact. Data on taxic diversity is a poor proxy for abundance, or for the actual environmental impact of these activities, however. Future assessments of the influence of ecological feedbacks on this event will require standardized assessments of the abundance of taxa with different ecological roles.


Ediacaran Cambrian Ecology Feedback Niche construction 



This paper is dedicated to Jeremy Jackson, in thanks for many long arguments over the years about evolutionary ecology. We acknowledge support from the NASA National Astrobiology Institute, discussions with D. Krakauer and J. Odling-Smee, the suggestions of P. Wagner and M. Kosnik, and comments from S. Burke and an anonymous reviewer.


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Copyright information

© Springer Science+Business Media B.V. (outside the USA) 2011

Authors and Affiliations

  1. 1.Department of Paleobiology, MRC-121National Museum of Natural HistoryWashingtonUSA
  2. 2.Santa Fe InstituteSanta FeUSA
  3. 3.Behavior, Ecology, Evolution and Systematics (BEES)University of MarylandCollege ParkUSA

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