Volume 47, No. 1



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Separating Black-browed Albatross Thalassarche melanophris and Atlantic Yellow-nosed Albatross T. chlororhynchos by osteological morphometric analysis


Authors

ALICE PEREIRA*1,2, MAURÍCIO TAVARES1,2 & IGNACIO BENITES MORENO1,2

1Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências, Universidade Federal do Rio Grande do Sul. Avenida Bento Gonçalves 9500, Agronomia, CEP 91501-970, Porto Alegre, RS, Brazil *(vakkerstormsjo@gmail.com)
2Centro de Estudos Costeiros, Limnológicos e Marinhos, Campus Litoral Norte, Universidade Federal do Rio Grande do Sul - CECLIMAR/CLN/UFRGS. Avenida Tramandaí 976, Centro, CEP 95625-000, Imbé, RS, Brazil


Received 19 October 2018, accepted 13 February 2019

Date Published: 2019/04/15
Date Online: 2019/04/02


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Appendix 1

Citation

PEREIRA, A., TAVARES, M. & MORENO, I.B. 2019. Separating Black-browed Albatross Thalassarche melanophris and Atlantic Yellow-nosed Albatross T. chlororhynchos by osteological morphometric analysis. Marine Ornithology 47: 139-148.


Key words: beach survey, discriminant analysis, mollymawk, osteology, Thalassarche


Abstract

Identifying albatross species in the wild involves recognizing plumage pattern and bill coloration. However, skeletal specimens in museums or deteriorated beached carcasses may lack the external characters needed for identification. Although it is possible to distinguish Black-browed Albatross Thalassarche melanophris from Atlantic Yellow-nosed Albatross T. chlororhynchos based on skull morphology, the specimen remains unidentified if the skull is not available. We measured 96 specimens of Black-browed and 55 Atlantic Yellow-nosed albatross, performing 64 measurements for the entire skeleton. Fifty-nine measurements were based on the literature and five new measurements were established specifically for this work. To search for morphometric differences, we first carried out t-tests and principal component analysis (PCA). Then, we performed discriminant function analysis on PCA results and on six selected postcranial measurements to generate a discriminant function. Sixty-one means (93.85 %) of Black-browed Albatross measurements were significantly larger than those of Atlantic Yellow-nosed Albatross. The discriminant function containing the six selected postcranial measurements correctly identified 97.35 % of the specimens through reclassification. This is the first work on osteological morphometric analysis of the entire skeleton for Black-browed and Atlantic Yellow-nosed albatross that is based on a large sample of specimens.


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