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Did hybridization save the Norfolk Island boobook owl Ninox novaeseelandiae undulata?

Garnett, Stephen T., Olsen, Penny, Butchart, Stuart H. M. and Hoffmann, Ary A. (2011). Did hybridization save the Norfolk Island boobook owl Ninox novaeseelandiae undulata?. Oryx: Journal of Fauna and Flora International,45(4):500-504.

Document type: Journal Article
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IRMA ID 82057923xPUB68
Title Did hybridization save the Norfolk Island boobook owl Ninox novaeseelandiae undulata?
Author Garnett, Stephen T.
Olsen, Penny
Butchart, Stuart H. M.
Hoffmann, Ary A.
Journal Name Oryx: Journal of Fauna and Flora International
Publication Date 2011
Volume Number 45
Issue Number 4
ISSN 0030-6053   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-80955126800
Start Page 500
End Page 504
Total Pages 5
Place of Publication Cambridge, United Kingdom
Publisher Cambridge University Press
HERDC Category C1 - Journal Article (DIISR)
Abstract The population of the Norfolk Island boobook owl Ninox novaeseelandiae undulata, a nocturnal bird restricted to the Australian territory of Norfolk Island, was reduced to a single female in 1986. Deliberate introduction of two males of its nearest relative, the New Zealand boobook N. n. novaeseelandiae, as a conservation intervention has allowed the taxon to persist on Norfolk Island, albeit in hybrid form. Although declared Extinct in 2000, a re-examination of this unique situation has concluded there is a strong argument that the taxon should be categorized as Critically Endangered because, on average, approximately half the nuclear genome of the original taxon and all the mitochondrial DNA is conserved in all living owls on the island. This thus represents a special case in which the taxon can be considered to be extant, in hybrid form, even though no pure-bred individuals survive. More generally, we suggest that, in exceptional cases, hybridization may not be a threat to highly threatened species and that guidelines are needed to determine when to consider hybrid populations as extant forms of the original taxon, and when to declare extinction through hybridization.
Keywords Extinction
IUCN Red List criteria
Ninox novaeseelandiae undulata
Norfolk Island
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