The canine counts! Significance of a craniodental measure to describe sexual dimorphism in canids : Golden jackals (Canis aureus) and African wolves (Canis lupaster)

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Hatlauf , J , Krendl , L M , Tintner , J , Griesberger , P , Heltai , M , Markov , G , Viranta , S & Hackländer , K 2021 , ' The canine counts! Significance of a craniodental measure to describe sexual dimorphism in canids : Golden jackals (Canis aureus) and African wolves (Canis lupaster) ' , Mammalian Biology , vol. 101 , no. 6 , pp. 871-879 . https://doi.org/10.1007/s42991-021-00133-2

Title: The canine counts! Significance of a craniodental measure to describe sexual dimorphism in canids : Golden jackals (Canis aureus) and African wolves (Canis lupaster)
Author: Hatlauf, Jennifer; Krendl, Lisa Maria; Tintner, Johannes; Griesberger, Paul; Heltai, Miklos; Markov, Georgi; Viranta, Suvi; Hackländer, Klaus
Contributor organization: Department of Anatomy
Faculty of Medicine
University of Helsinki
Date: 2021-12
Language: eng
Number of pages: 9
Belongs to series: Mammalian Biology
ISSN: 1616-5047
DOI: https://doi.org/10.1007/s42991-021-00133-2
URI: http://hdl.handle.net/10138/340478
Abstract: Sexual dimorphism is a widespread phenomenon among mammals, including carnivorans. While sexual dimorphism in golden jackals (Canis aureus) has been analysed in the past, in the related and apparently convergent canid, the African wolf (Canis lupaster), it is poorly studied and showed to be relatively small. Previously, sexual size dimorphism (SSD) research in these species was mostly based on skull and body measurements. In our study, we also included dental measurements, namely the diameter of the canine. We used 11 measured sections of 104 adult specimens, comprising 61 golden jackal and 43 African wolf skulls. Data analyses were carried out through logistic regression and conditional inference trees (CIT). To compare the results of SSD to other species, sexual dimorphism indices (SDI) were calculated. Golden jackals and African wolves show significant sexual size dimorphism, both in cranial and dental size. The logistic regression revealed that the mesiodistal diameter of the upper canine is most effective in discerning the sexes. The difference in the calculated SDI of the canine diameter between the sexes amounted to 8.71 in golden jackals and 14.11 in African wolves, respectively-with regional diversity. Thus, the canine diameter is an important measure to investigate SSD as well as an easy tool to apply in the field.
Subject: Canidae
Skull morphometrics
Sexual dimorphism index
Craniodental dimensions
FOX VULPES-VULPES
CRANIAL VARIABILITY
SIZE DIMORPHISM
RED FOX
GEOGRAPHIC-VARIATION
CARNIVORES
STRENGTH
MAMMALIA
SHAPE
1181 Ecology, evolutionary biology
1184 Genetics, developmental biology, physiology
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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