From: Chris Shaw <>
Date: Tue, 2 Nov 2010 06:49:12 +1030

You are entering the world of Systematics and Biogeography which has more 
theories and opinions than there are excuses for a day off work including my 
own theories which are Christian based and by inference wacky!

You are using the biological species concept in describing species as defined 
by their breeding isolation but as you have correctly pointed out so-called 
separate species can interbreed. Phylogenic and Ecological species concepts 
have their own explanations as to what species are and what are not and go in 
and out of fashion depending on where you did you study.

The world has a number of geographical regions divided by such artificial 
barriers such as the Wallace Line. Australia also has a number of biogeographic 
regions which are used to explain why we have so many similar looking species 
in different areas and is another huge area of interest.

I have a few posts in the science section of my blog if you are interested. 
Also note that Charles Sturt Uni has a Graduate Certificate of Ornithology 
available to amateur bird people which covers these subjects comprehensively. 
It's an expensive course for what you get but... moving on... the course has 
whole units on this subject which is only the tip of the iceberg and  opens 
your eyes to the huge world of dissension that exists in scientific theory.

Good luck and good subject...


Chris Shaw

Mobile 0409 675912

My blog - "Top Birds and Everyfing" can be found on the following link

"Not choice, but habit rules the unreflecting crowd." - WILLIAM WORDSWORTH

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