Age Composition and sexual size dimorphism of albatrosses and petrels off Brazil

Bugoni, L. and Furness, R.W. (2009) Age Composition and sexual size dimorphism of albatrosses and petrels off Brazil. Marine Ornithology, 37(3), pp. 253-260.

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We present data on age composition and sexual size dimorphism (SSD) of albatrosses, petrels and shearwaters in southern Brazil for 301 birds of 14 species captured live at sea. The pelagic community of seabirds off Brazil comprises birds of different ages and breeding status according to species. Although juveniles of some species such as Black-browed Albatross <i>Thalassarche melanophris</i> and Southern Giant Petrel <i>Macronectes giganteus</i> predominated, all age classes (including breeding birds) were recorded for Atlantic Yellow-nosed <i>T. chlororhynchos</i> and Wandering <i>Diomedea exulans</i> albatrosses. For this heterogeneous community composed of individuals from different colonies, with adults and immature birds pooled, the SSD was more pronounced in bill measurements than in other traits (confirming previous studies) and more conspicuous in giant petrels and <i>Diomedea</i> albatrosses. Closely related species pairs of <i>Thalassarche</i> albatrosses and <i>Procellaria</i> petrels had differing levels of sexual dimorphism. All linear external traits measured within <i>Thalassarche</i> and <i>Procellaria</i> overlapped considerably and, despite being significantly different, were not adequate for species determination or sexing.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Furness, Professor Robert
Authors: Bugoni, L., and Furness, R.W.
Subjects:Q Science > QL Zoology
College/School:College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
Journal Name:Marine Ornithology
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