[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Extinction once again (was Re: ARE ORNITHOPODS BORING?)



In a message dated 2/17/01 7:46:16 AM Pacific Standard Time, 
jbois@umd5.umd.edu writes:

<< ...adding stress to species which nested on the shores of the "Oceans of
 Kansas."  Habitat loss is the main cause of  today's extinctions--why
 would we doubt that it was important in other times--especially when we
 know that vast tracts of potential nesting territory were reduced to zero? >>
    
    This is pure speculation, but I would assume, that as in the present, 
waterfowl of the K probably took advantage of the high productivity of the 
long days of the upper latitudes during the nesting season. Productive 
nesting areas today are places like the Yukon delta. Deltas wouldn't have 
been effected that much by regressions unless the strandlines approached the 
edge of the continental shelf.  Remember also that the Western Interior 
Seaway turned into one huge delta in the latest K. I see nesting real estate 
for waterbirds actually increasing.   
    Focusing on the "Oceans of Kansas" for models of the K/T extinction Is 
using way too small of an area for a sample in my opinion. What would have 
been happening in Antarctica during the final K regression, for instance? DV.