期刊
CANADIAN JOURNAL OF ZOOLOGY
卷 100, 期 1, 页码 119-132出版社
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cjz-2021-0112
关键词
toothed whale; morphology; asymmetry; partial least squares; Pseudorca crassidens; false killer whale
类别
资金
- Liverpool John Moores University (LJMU) scholarship
- LJMU research grant
This study examined cranial morphological variation in a population of false killer whales stranded in Scotland. The results showed that males have larger skulls than females, but there was no sexual dimorphism in cranial and mandibular shape. This suggests the presence of sexual size dimorphism but the absence of sexual shape dimorphism in this population.
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.
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