[Odonata-l] help with oxygen...

[DAllanFItc@aol.com]

Do we have a firm idea of when immature odonates shifted from terrestrial  to 
aquatic?   perhaps the "giant" adults spent some portion part of  development 
on land, giving them access to "best of both worlds" for prey at  different 
stages of development.
 
 
David Allan Fitch
Worldwide Dragonfly  Association, Treasurer
33 Bedford Street, Suite 9
Lexington, MA 02420  USA
 
 

 
In a message dated 07/11/2008 2:20:56 P.M. Eastern Daylight Time,  
ethanbr at umich.edu writes:

I'm sure  that larger 
odonates required longer periods for nymphs to develop. That  would have 
made them susceptible not only to fish and immature amphibian  predation 
(and probably other arthropod and invertebrate parasites), but  also 
probably to the increasingly drier continental conditions (and higher  
salinity?; also higher dissolved oxygen stress?) of the later Permian  
aquatic environments.

David Allan Fitch
WDA Treasurer
33 Bedford  Street, Suite 9
Lexington, MA 02420 USA
tel 781-861-1000
fax  781-861-0991





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