Sunday, July 23, 2017

Sex determination of black petrels (Procellaria parkinsoni) using morphometric measurements and discriminant function analysis

TitleSex determination of black petrels (Procellaria parkinsoni) using morphometric measurements and discriminant function analysis
Publication TypeJournal Article
Year of Publication2015
AuthorsMischler, CP, Bell, EA, Landers, TJ, Dennis, TE
JournalNotornis
Volume62
Issue2
Pagination57-62
Type of ArticleFull Article
Keywordsblack petrel, conservation, field measurements, population dynamics, sexing
Abstract

Discriminant function analysis (DFA) is widely used to determine sex in the field from morphological measurements of bird species with monomorphic plumage. Sexual dimorphism was examined in black petrels (Procellaria parkinsoni) using 7 external measurements of adult birds breeding on Great Barrier Island, New Zealand. Males were significantly larger than females in absolute values of all measurements except for tarsus. Two stepwise DFA models were developed. The first used all 7 parameters, while the second model used only 6 parameters in order to increase sample size. Model one and two showed an 88 and 82% classification success, respectively, most likely due to the high overlap in measurements between males and females. These canonical functions were not accurate enough for field surveys, but may be improved using a larger and more representative sample size.

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