Defining species: PSC

Subject: Defining species: PSC
From: "Carol Probets" <>
Date: Wed, 20 Jan 1999 04:23:00 PST
On 19th Jan, Hugo Phillips wrote (regarding the roughly 9700 bird 
species in the world):

"Moreover, this is using the traditional Biological Species Concept. If 
you adopt an alternative way of defining species, the Phylogenetic 
Species Concept, the total might be closer to 30,000."

Can someone out there provide a simple explanation of the Phylogenetic 
Species Concept (or suggest a suitable reference)? 
I can't find it in any of my books.


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