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SUMMARY:Are palaeobiodiversity patterns more apparent than real? - Graeme 
 Lloyd\, Oxford University
DTSTART:20120220T170000Z
DTEND:20120220T180000Z
UID:TALK35689@talks.cam.ac.uk
CONTACT:Ekbal
DESCRIPTION:As early as 1972 the noted palaeobiologist David Raup suggeste
 d that estimates of palaeobiodiversity - the changing number of species ov
 er geological time - may be more apparent than real as they closely tracke
 d that of available rock. However\, in the subsequent 30 years most palaeo
 biologists interpreted their diversity curves at face value. It wasn't unt
 il the last decade that the problem of potential bias was revisited\, this
  time with more sophisticated data and methods. Strong correlations betwee
 n palaeobiodiversity and proxies for either sampling or rock volume were f
 requently found\, although their interpretation remains contentious. Here 
 I show that a sampling bias explanation for some palaeobiodiversity patter
 ns is inescapable.
LOCATION:Harker Room 1\, Department of Earth Sciences
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