Cranial Allometry, Sexual Dimorphism and Age Structure in Sample of the Egyptian Wolf Canisanthuslupaster

Younes, Mahmoud; Fouad, Fouad F.

doi:10.21608/absb.2016.24336

Cited by 4 publications

(5 citation statements)

References 7 publications

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“…Few studies have reported SSD in African wolves. For Egyptian specimen of African wolves, male and female dimensions appeared to be different (Osborn and Helmy 1980;Younes and Fouad 2016). The skulls of males are relatively wider, and females tended to have a shorter snout (Younes and Fouad 2016).…”

Section: Introductionmentioning

confidence: 88%

“…For Egyptian specimen of African wolves, male and female dimensions appeared to be different (Osborn and Helmy 1980;Younes and Fouad 2016). The skulls of males are relatively wider, and females tended to have a shorter snout (Younes and Fouad 2016). Van Valkenburgh and Wayne (1994) found SSD in the mediolateral dimension of the upper canine in both the golden jackal and the African wolf, where the average difference was 4% (in a range of 0-13%).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…In addition to 8 indices were calculated. The parameters measured were adopted from those reported previously [ 22 , 31 , 33 , 37 ]. Skull indices were calculated following the method reported by Andreis et al [ 42 ].…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, canine morphometric measurements have been reported to be helpful tool for calculation of the total intraconal anesthetic volume [ 29 ] The phenotypic variation in the red fox skull results from natural selection while that of the domestic dog results from artificial selection or domestication [ 30 ]. Several studies have been done to investigate the morphometric measurements of skulls in several Canid species including the red fox, silver fox, corsac fox, golden jackals, Egyptian wolf, dog, lion, and cat [ 22 , 25 , 27 , 31 – 38 ]. These studies revealed that morphometric measurements of the skull are crucial for species identification.…”

Section: Introductionmentioning

confidence: 99%

Comparative craniometric measurements of two Canid species in Egypt: the Egyptian red fox and the Egyptian Baladi dog

Mahdy

Mohamed

2022

BMC Vet Res

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The Egyptian red fox (Vulpes vulpes aegyptiaca) and Egyptian Baladi dog (Canis familiaris) are two members of the Family Canidae that are widely distributed in Egypt. The skulls of different Canid species vary greatly in their size and shape; therefore, they can be used as a tool to study the evolution and evolutionary history of these animals. The craniometric measurements are crucial for species identification and determination of the specific sites for nerve blocks. The present study compared the craniometric measurements of the red fox and Baladi dog skulls by measuring 47 parameters on each skull and calculation of 8 indices. The red fox skull had significantly lower values of 41 craniometric measurements (approximately 87% of the measurements done), including skull length, width, and height, cranial length and width, palatal and mandibular length, and dental measurements. In contrast, the red fox had significantly higher values of only 3 measurements (approximately 6% of the measurements done) including the tympanic bulla measurement. While only three skull measurements did not differ significantly between the red fox and dog. Statistics revealed that domestic dog had significantly higher values of foramen magnum and palatine indices, and significantly lower value of nasal index than those of red fox. The present work reported variations in the gross and craniometric measurements of skull between the red fox and dog. The measured cranial parameters of both adult animals provide valuable information that can be used in ecological studies, comparative anatomy, and clinical veterinary sciences.

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“…In the studies made by Özcan et al (2010), Karimi et al (2011), Dalga et al (2018), Popoola and Oseni (2018), Choudhary et al (2020), Gündemir et al, (2020a), Jashari et al (2022), different sheep skulls were studied and differences between breeds were revealed. Other morphometric studies are undertaken in the skull of different Canids to reveal their features and to use these data in specie identification or in comparative studies such as in dogs (Daskiran & Cedden, 2006; İlgün et al, 2022; Monfared, 2013; Onar, 1999; Onar et al, 2001), lions (Zuccarelli, 2003), cats (Saber et al, 2016) felines (Saber & Gummow, 2015), red foxes (Munkhzul et al, 2018; Onar et al, 2005), wolfs and jackals (Andersone & Ozolins, 2000; Janssens et al, 2019; Milencovic et al, 2010; Rezić et al, 2017; Srinivas & Jhala, 2021; Stoyanov, 2012; Younes & Fouad, 2016).…”

Section: Introductionmentioning

confidence: 99%

Morphometric analysis for the sex determination of the skull of the Deltari Ilir dog (Canis lupus familiaris) of Kosovo

Jashari

Kahvecioğlu

Duro

et al. 2022

Anat Histol Embryol

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This study aimed to explain the sex determination of the autochthonous dog Deltari Ilir with both morphometric and geometric analysis methods. For this purpose, 24 Deltari Ilir dog skulls (12 females and 12 males) were used in the study. The difference between males and females at 6 values was statistically significant. The most statistically significant difference was seen in the measurement of the greatest breadth of the occipital condyles (p < 0.000). This measurement was higher in male skulls. The next most significant difference was seen in the greatest inner height of the orbit measurement (p < 0.002). This measurement was also higher than for females. In general, the skull length measurements of male dogs were higher than that of females. Male dog skulls had greater skull length and skull height. The lateral view was used for geometric analysis and 14 landmarks were determined. As a result of principal component analysis, 22 PC values were obtained. PC1 accounted for 23.73% of the total variance. As a result of canonical variants analysis, it was observed that males and females were completely separated from each other. The caudal part of the males was wider than the females in geometric analysis. As a result of the study, sex‐determining characteristics were revealed for the Deltari Ilir dog. It was seen that gender analysis could be done with both morphometric and geometric analysis methods. In addition, it was seen that morphometric results and geometric analysis results supported each other. Moreover, the results of the study will be useful in the function of comparative anatomy, in veterinary clinical practice, in zooarchaeology but why not also in the veterinary forensic investigation.

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Cranial Allometry, Sexual Dimorphism and Age Structure in Sample of the Egyptian Wolf Canisanthuslupaster

Cited by 4 publications

References 7 publications

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

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

Comparative craniometric measurements of two Canid species in Egypt: the Egyptian red fox and the Egyptian Baladi dog

Morphometric analysis for the sex determination of the skull of the Deltari Ilir dog (Canis lupus familiaris) of Kosovo

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