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Skull morphological variation in a British stranded population of false killer whale (Pseudorca crassidens, Owen 1846): a 3D geometric morphometric approach

Vicari, D, Sabin, RC, Brown, RP, Lambert, O, Bianucci, G and Meloro, C (2022) Skull morphological variation in a British stranded population of false killer whale (Pseudorca crassidens, Owen 1846): a 3D geometric morphometric approach. Canadian Journal of Zoology, 100 (2). pp. 119-132. ISSN 0008-4301 (Accepted)

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Abstract

The false killer whale (Pseudorca crassidens (Owen, 1846)) is a globally distributed delphinid that shows geographical differentiation in its skull morphology. We explored cranial morphological variation in a sample of 85 skulls belonging to a mixed sex population stranded in the Moray Firth, Scotland, in 1927. A three-dimensional digitizer (Microscribe 2GX) was used to record 37 anatomical landmarks on the cranium and 25 on the mandible to investigate size and shape variation and to explore sexual dimorphism using geometric morphometric. Males showed greater overall skull size than females, whereas no sexual dimorphism could be identified in cranial and mandibular shape. Allometric skull changes occurred in parallel for both males and females, supporting the lack of sexual shape dimorphism for this particular sample. Also, fluctuating asymmetry did not differ between crania of males and females. This study confirms the absence of sexual shape dimorphism and the presence of a sexual size dimorphism in this false killer whale population.

Item Type: Article
Uncontrolled Keywords: Science & Technology; Life Sciences & Biomedicine; Zoology; toothed whale; morphology; asymmetry; partial least squares; Pseudorca crassidens; false killer whale; PORPOISES PHOCOENA-PHOCOENA; BOTTLE-NOSED-DOLPHIN; HARBOR PORPOISES; DELPHINUS-DELPHIS; SEXUAL-DIMORPHISM; DIVING BEHAVIOR; TOOTHED WHALES; COMMON DOLPHIN; PREY SIZE; FLUCTUATING ASYMMETRY; Ecology; 0602 Ecology; 0608 Zoology
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QH Natural history > QH301 Biology
Q Science > QL Zoology
Divisions: Biological & Environmental Sciences (new Sep 19)
Publisher: Canadian Science Publishing
SWORD Depositor: A Symplectic
Date Deposited: 25 May 2022 08:26
Last Modified: 25 May 2022 08:30
DOI or Identification number: 10.1139/cjz-2021-0112
URI: https://researchonline.ljmu.ac.uk/id/eprint/16917

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