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Solar Radiation as Driving Force In Early EvolutionUltraviolet radiation (UVR) has provided an evolutionary challenge to life on Earth in that it is both an agent of mutation and as well as a selective force. Today surface fluxes of UVR vary diurnally, seasonally, etc. Still, the UVR flux was probably substantially higher during the early phases of evolution, suggesting that its role in evolution was even more prominent during this time. In this presentation, the creative role of UVR in evolution is discussed, specifically in connection with the role that UVR may have played in the evolution of early microbial ecosystems. The presentation will include discussions of the direct influence of UVR on such processes as photosynthesis and genetic damage, as well as the indirect influence of UVR as mediated through the production of reactive oxygen species. These biological effects of UVR will be viewed against the backdrop of the physical nature of the early Earth, surely a very different place then than now.
Document ID
20020054428
Document Type
Conference Paper
Authors
Rothschild, Lynn J. (NASA Ames Research Center Moffett Field, CA United States)
Peterson, David L.
Date Acquired
August 20, 2013
Publication Date
January 1, 2002
Subject Category
Solar Physics
Meeting Information
AAAS Conference(Boston, MA)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.