Proterozoic and Early Cambrian Protists: Evidence for Accelerating Evolutionary Tempo

DSpace/Manakin Repository

Proterozoic and Early Cambrian Protists: Evidence for Accelerating Evolutionary Tempo

Citable link to this page

. . . . . .

Title: Proterozoic and Early Cambrian Protists: Evidence for Accelerating Evolutionary Tempo
Author: Knoll, Andrew
Citation: Knoll, Andrew H. 1994. Proterozoic and early Cambrian protists: Evidence for accelerating evolutionary tempo. Proceedings of the National Academy of Sciences of the United States of America 91, no. 15: 6743-6750.
Access Status: At the direction of the depositing author this work is not currently accessible through DASH.
Full Text & Related Files:
Abstract: In rocks of late Paleoproterozoic and Mesoproterozoic age (ca. 1700-1000 million years ago), probable eukaryotic microfossils are widespread and well preserved, but assemblage and global diversities are low and turnover is slow. Near the Mesoproterozoic-Neoproterozoic boundary (1000 million years ago), red, green, and chromophytic algae diversified; molecular phylogenies suggest that this was part of a broader radiation of ''higher'' eukaryotic phyla. Observed diversity levels for protistan microfossils increased significantly at this time, as did turnover rates. Coincident with the Cambrian radiation of marine invertebrates, protistan microfossils again doubled in diversity and rates of turnover increased by an order of magnitude. Evidently, the Cambrian diversification of animals strongly influenced evolutionary rates within clades already present in marine communities, implying an important role for ecology in fueling a Cambrian explosion that extends across kingdoms.
Published Version: http://dx.doi.org/10.1073/pnas.91.15.6743
Other Sources: http://www.pnas.org/content/91/15/6743.full.pdf
http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=44278&blobtype=pdf
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3196095

Show full Dublin Core record

This item appears in the following Collection(s)

  • FAS Scholarly Articles [6948]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

Search DASH


Advanced Search
 
 

Submitters