|Paper No. 187-34|
|Presentation Time: 8:00 AM-12:00 PM|
|ONTOGENETIC DEPTH AS A COMPLEXITY METRIC FOR THE CAMBRIAN EXPLOSION|
ROSS, Marcus R., Geology and Geological Engineering, South Dakota School of Mines and Technology, 501 E. St. Joseph St, Rapid City, SD 57701, email@example.com and NELSON, Paul A., The Discovery Institute, 615 Milwaukee Avenue, Glenview, IL 60025-5636|
Various attempts have been made to quantify the increase in biological complexity exhibited by metazoans across the Neoproterozoic-Cambrian boundary. These include such metrics as genome size, cell type (Valentine et al. 1994), and a variety of complexity measures (e.g., McShea 1996). Here we develop a measure of ontogenetic depth – i.e., the distance, in terms of cell division and differentiation, between a unicellular condition and a macroscopic adult metazoan capable of reproduction (generation of gametes). We then apply this metric to the radiative events which occurred during the Cambrian Explosion, and assess the evolutionary mechanisms that may explain the increases in ontogenetic depth at the origin of the phyla.
2002 Denver Annual Meeting (October 27-30, 2002)
|Session No. 187|
Paleontology/Paleobotany (Posters) II
Colorado Convention Center: Exhibit Hall
8:00 AM-12:00 PM, Wednesday, October 30, 2002
© Copyright 2002 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.