1. bookVolume 14 (2020): Issue 1 (December 2020)
Journal Details
License
Format
Journal
eISSN
2644-5247
First Published
09 Nov 2012
Publication timeframe
1 time per year
Languages
English
Open Access

Comparison of orbital asymmetries among some raptor species: “when size does not matter”

Published Online: 30 Apr 2021
Volume & Issue: Volume 14 (2020) - Issue 1 (December 2020)
Page range: 23 - 27
Received: 23 Jul 2020
Accepted: 29 Oct 2020
Journal Details
License
Format
Journal
eISSN
2644-5247
First Published
09 Nov 2012
Publication timeframe
1 time per year
Languages
English
Abstract

A sample of 73 dry, well-preserved skulls was studied, representing various species of raptors with different foraging strategies. The sample included Accipiter nisus (n = 15), Buteo buteo (n = 13), Gyps fulvus (n = 24) and Neophron percnopterus (n = 5), Bubo bubo (n = 16) and Tyto alba (n = 2). Geometric morphometric methods were used to detect orbital asymmetries. On digital pictures of each skull side, a set of 16 semi-landmarks and two landmarks were located in order to describe the orbital ring. The variables were analysed based on Generalized Procrustes analysis. The morphometric data showed that the orbital asymmetry of raptors differed significatively between species, although directional asymmetry (e.g. left orbita systematically more developed than the right) appeared not to be correlated with orbital size. This indicates that larger orbitas do not lead to greater asymmetry. Differences between species should rather be explained by their foraging strategies and degree of visual obstruction in their natural environment.

Keywords

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