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Re: Ornithurine diversity



Not to forget that most or even all ornithurines from that region
bought the
farm 10 million years later too, making the point of pre-boundary competition
somewhat moot.<<<


Well, if ornithurines had speciated to the point of greater diversity due in part to competative replacement/exclusion of enantiornithines, then their higher species count and larger range of ecomorphs would have made them statistically less likely to be totally wiped out.

Obviously Nick's study would only be one data point to try and answer this question, but until we get others it's certainly suggestive, and framing the data into a larger hypothesis on K/T extinction can only spur on similar studies to confirm or refute it, so it seems like a perfectly reasonable idea to float to me.


Scott Hartman Science Director Wyoming Dinosaur Center 110 Carter Ranch Rd. Thermopolis, WY 82443 (800) 455-3466 ext. 230 Cell: (307) 921-8333

www.skeletaldrawing.com


-----Original Message----- From: evelyn sobielski <koreke77@yahoo.de> To: dinosaur@usc.edu Sent: Thu, 10 Jul 2008 5:08 pm Subject: Re: Ornithurine diversity



How could it possibly do that? It's Campanian, at least
10 million years
older than the K-Pg boundary, and it's just a few
coracoids. And last but
not least, the complete absence of enantiornithean
coracoids (so far) makes
it impossible to see how the diversity and abundance of eu-
vs
enantiornitheans changed over time.

Not to forget that most or even all ornithurines from that region bought the
farm 10 million years later too, making the point of pre-boundary competition
somewhat moot.



Eike


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