Phil,
I suspect the relevant article is:
J. A. Norman, L. Christidis, L. Joseph, B. Slikas & D. Alpers (2002)
Unravelling a biogeographical knot: origin of the 'leapfrog' distribution
pattern of Australo-
Papuan sooty owls (Strigiformes) and logrunners (Passeriformes)
Proceedings of the Royal Society of London Series B. Biological Sciences.
269, 2127-
2133.
The full text is available for free at:
http://www.journals.royalsoc.ac.uk/media/AGXY6YFB3V3XWH5D6DCG/Contributions/K/R/U
/Q/KRUQ5EYYMWWXY1NT.pdf
It says "Low levels of sequence divergence among sooty owls
raise doubts about the current circumscription of the
complex into two species. All three taxa were similarly
divergent from one another in both the mitochondrial
(0.60?0.80%) and nuclear (0.20?0.40%) DNA sequences
(table 1b). Comparison with cytochrome b or ND2
sequences of strigid owls indicates that these estimates are
an order of magnitude lower than typically observed
among owl species."
Regards,
Murray Lord
Sydney
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