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

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Abstract

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.

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Authors and Affiliations

  1. Norwegian Institute for Nature Research, Tungasletta 2, N-7005, Trondheim, Norway

    Svein-Håkon Lorentsen & Nils Røv

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  1. Svein-Håkon Lorentsen
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  2. Nils Røv
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Publication No. 116 of the Norwegian Antarctic Research Expeditions (1991/92)

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Lorentsen, SH., Røv, N. Sex determination of Antarctic Petrels Thalassoica antarctica by discriminant analysis of morphometric characters. Polar Biol 14, 143–145 (1994). https://doi.org/10.1007/BF00234977

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  • DOI: https://doi.org/10.1007/BF00234977

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