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Seasonal variation in the size of the gular lobe of a Male Musk Duck Biziura lobata

journal contribution
posted on 2011-06-01, 00:00 authored by M Cowling, Patrick GuayPatrick Guay
The Musk Duck Biziura lobata possesses elaborate secondary sexual traits that are not present among other ducks and include a leathery lobe attached at the base of the lower mandible of the male, which is thought to become larger at certain times of the year. To establish the extent of this seasonal variation, a captive male Musk Duck was photographed each month for a period of 16 months. Quantitative analysis of the photographs demonstrated seasonal variation in the area of the lobe, with an almost threefold difference between the smallest and largest measurement. Reasons for this variation are discussed.

History

Journal

Australian Field Ornithology

Volume

28

Issue

2

Pagination

88 - 91

Publisher

Bird Observers Club of Australia

Location

Melbourne, Vic.

ISSN

1448-0107

Language

eng

Publication classification

CN.1 Other journal article

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