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dinosaur diversity pre K-Pg... declining?



Of potential interest:

Lloyd, Graeme T. (2011).  "A refined modelling approach to assess the
influence of sampling on palaeobiodiversity curves: new support for
declining Cretaceous dinosaur richness", _Biology Letters_ published
online 20 April, 2011, doi: 10.1098/rsbl.2011.0210

In case you don't know, you can find any publication with a doi number
by going here:

dx.doi.org

That doesn't mean you can retrieve the full text for free, of course.
I don't have the full version so please don't ask me for it.

But here is the abstract:

Modelling has been underdeveloped with respect to constructing
palaeobiodiversity curves, but it offers an additional tool for
removing sampling from their estimation. Here, an alternative to
subsampling approaches, which often require large sample sizes, is
explored by the extension and refinement of a pre-existing modelling
technique that uses a geological proxy for sampling. Application of
the model to the three main clades of dinosaurs suggests that much of
their diversity fluctuations cannot be explained by sampling alone.
Furthermore, there is new support for a long-term decline in their
diversity leading up to the Cretaceous–Paleogene (K–Pg) extinction
event. At present, use of this method with data that includes either
Lagerstätten or ‘Pull of the Recent’ biases is inappropriate, although
partial solutions are offered.

--
Mickey Rowe     (MickeyPRowe@gmail.com)