Skip to main content

    Sex determination of Antarctic petrels Thalassoica antarctica by discriminant analysis of morphometric characters

    Request Meeting Document
    Document Number:
    S.-H. Lorentsen and N. Røv (Norway)
    Agenda Item(s)

    We present data on sexual dimorphism in some morphological measurements (wing length, head length, bill depth and bill length) in the Antarctic Petrel Thalassoica antarctica. Males were on average larger than females for all measurements. Sexual dimorphism was on average largest for bill depths whereas wing lengths discriminated least between the sexes. A discriminant function including bill depth, head length and wing length correctly sexed 92% of the sample. Due to between-measurer variation it is recommended that morphometric measurements obtained by others on sexed birds are compared with ours before proceeding with the use of the discriminant function on unsexed individuals.

    Top of page

    © Copyright - Commission for the Conservation of Antarctic Marine Living Resources 2021, All rights reserved.

    Site by Eighty Options