Wednesday, July 26, 2017

Field weights and measurements of Australasian shoveler (Anas rhynchotis) in New Zealand

TitleField weights and measurements of Australasian shoveler (Anas rhynchotis) in New Zealand
Publication TypeJournal Article
Year of Publication2014
AuthorsWilliams, M
JournalNotornis
Volume61
Issue1
Pagination19-26
Type of ArticleFull Article
KeywordsAnas rhynchotis, Australasian shoveler, measurement, New Zealand, weight
Abstract

Weights and measurements of 120 male and 109 female adult and juvenile Australasian shovelers (Anas rhynchotis) were obtained from fresh specimens shot in May, mostly during 1976-1979, at 2 sites in North Island, New Zealand. Mean weights of adult males (634 g) and juvenile males (616 g) were significantly greater than those of adult (608 g) and juvenile (558 g) females. For both sexes, weight/tarsus length2 ratios of juveniles were significantly lower than adults but there was no difference between sexes within each age class. Measurements of bill length and width, tarsus and mid-toe-and-claw, and wing and tail lengths are presented for each sex and age class. All measured characters of juvenile males were significantly longer than juvenile females and adult males were significantly longer than adult females. Within each sex, only wing and tail lengths of adults were significantly longer than juveniles. These findings are typical of other shoveler species.

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