New Zealand Journal of Zoology abstracts
Introgressive hybridisation, ducks, and ecological character displacement
MALCOLM W. HADDON
Australian Maritime College
P.O. Box 21
Beaconsfield
Tasmania 7270, Australia
e-mail: m.haddon@fme.amc.edu.au
Abstract The debate over whether a significant level of
introgressive hybridisation is occurring in New Zealand between the indigenous
grey duck (
Anas superciliosa superciliosa) and the introduced mallard
(
Anas platyrhynchos) has been confused by a misquotation made by
Hitchmough et al. in 1990. This confusion is corrected. It is also pointed out
that introgressive hybridisation, if it leads to hybrid, intermediate
phenotypic forms, constitutes a previously unrecognised mechanism for character
convergence, which is recognised as a special case of the ecological process of
competitive character displacement.
Keywords New Zealand; ducks; introgressive hybridisation;
character displacement; character convergence; Anas platyrhynchos;
Anas superciliosa
Z97005
Received 5 February 1997; accepted 16 April 1998
PDF file of entire paper: medium quality (340K); (scanned from paper original: notes about this process)
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