Sexual dimorphism of pyrenean chamois (&lt;i&gt;Rupicapra p. pyrenaica&lt;/i&gt;) based on skull morphometry

García‐González, Ricardo; Barandalla, Ignacio

doi:10.3989/pirineos.2002.v157.58

Cited by 8 publications

(7 citation statements)

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“…Comparing the measured morphometric parameters between the male and female Saneen goats showed no significant differences. This result was in agreement with other previous reports in various goat breeds (García-González & Barandalla, 2002;Samuel et al, 2013).…”

Section: Discussionsupporting

confidence: 94%

Anatomy of the Skull of Saanen Goat. An anesthesiology and Stereology Approach

et al. 2021

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The Saanen goat is known as the greatest milk producer among small ruminat breeds. However, its morphometric features still remain unclear. Therefore, the present work aimed to investigate the functional anatomy of the upper and lower jaws as well as the volumetric properties of the male and female Saanen goat for clinical applications. The heads of 20 adult animals (10 males and 10 females) were included. Totally, 22 morphometric parameters were measured on three dimensional computed tomographic images using RadiAnt DICOM Viewer software and some parameters were measured on hot macerated sample. The mean volume of paranasal sinuses as well as conchal sinuses were estimated using stereological method. Based on the results, the differences between males and females were not significant (p>0.05) in all desired parameters.The frontal and lacrimal sinuses were the largest and smallest paranasal sinus in both sexes. Also, the dorsal and middle conchal sinuses were the largest and smallest ones, respectively. The common nasal meatus was the smallest and ventral meatus was the largest meatus in the nasal cavity.In conclusion, these findings provide a basic data that would be useful in blocking terminal branches of the cranial nerves in this breed for surgical purpose or teeth injuries treatment.

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Section: Discussionsupporting

confidence: 94%

Anatomy of the Skull of Saanen Goat. An anesthesiology and Stereology Approach

et al. 2021

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“…not only body size but also a wealth of phenotypic traits, such as the presence of a ruff, horns or antlers in males, as well as hair/plumage colour patterns, Eisenberg, 1981; Bradbury & Andersson, 1987; for syntheses: Clutton‐Brock, 1989; Pérez‐Barbería, Gordon & Pagel, 2002). Conversely, chamois is a near‐monomorphic species in horn size and shape, as well as coat colour (North‐Eastern chamois, Couturier, 1938; Knaus & Schröder, 1983; South‐Western chamois Rupicapra pyrenaica , Lovari & Scala, 1984; Garcia‐Gonzalez & Barandalla, 2002) and weakly dimorphic in body weight (adult males are about 25% heavier than adult females, with the peak of >30% among prime adults, e.g. Bassano, Perrone & Von Hardenberg, 2003; Toïgo & Gaillard, 2003; Garel et al , 2009).…”

Section: Introductionmentioning

confidence: 99%

Even mortality patterns of the two sexes in a polygynous, near‐monomorphic species: is there a flaw?

2010

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The chamois Rupicapra rupicapra has been termed a highly polygynous species, with a great male competition for mating. If so, a lower survival should be expected for the male sex. From 1986 to 2000, 1801 carcasses of chamois were collected in the Maritime Alps Regional Park, Italy, where a protected, healthy, stable population of chamois occurred (c. 12 individuals 100 ha À1 ). Each year, population structure from carcasses was consistent with that from the count carried out on the preceding year on live individuals. Demographic features (assessed from mortality data, as well as from live counts) showed a balanced age structure and a good adult survival (10% individuals older than 11 years). Mortality peaks showed a cyclic pattern of 3-4 years. Winter severity and local density affected survival, with no significant difference between sexes. The number of carcasses was dependent on the combination of snow depth and mean temperature, in winter. Both sexes showed nearly the same survivorship curves, with a quite similar life expectancy in the first year (males = 6.8 years, females =7.0 years), and the same maximum age at death (16 years), as it may be expected in a monomorphic, monogamous species. This is, however, a rare event among polygynous species, with a high male competition for females and male juvenile dispersion, which normally affect male survival. The similar adult survival of the two sexes could be explained by comparable energetic costs and risks for reproduction, or through greater fat reserves put on by males, before the rut, which may lower their winter mortality.

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“…Size differences can contribute to the overall degree of horn shape dimorphism found between sexes through the effect of allometry. Basal perimeter and the total length of the horns are significantly higher in males than in females , García-González and Barandalla 2002, Bassano et al 2003, and the effect of this difference depends on horn growth throughout the individual's life. Given that the greatest horn shape differences between the sexes can be found in older ages, it can be argued that the influence of horn elongation on the degree of curvature may introduce allometric variation.…”

Section: Introductionmentioning

confidence: 97%

“…To date, most studies on chamois horns focused on sexual size dimorphism (SSD) (Pérez-Barbería et al 1996, Scala and Lovari 1984, García-González and Barandalla 2002, Garel et al 2009). By contrast, horn curvature received relatively little attention.…”

Section: Introductionmentioning

confidence: 99%

Sexual shape dimorphism in Alpine chamois (Rupicapra rupicapra) horns: how horn curvature could be used in sex identification?

Blagojević¹,

Milošević-Zlatanović²

2014

Mammalia

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We used horn outlines with elliptic Fourier analysis to quantify horn shape as well as horn outline areas to quantify horn size in 26 Alpine chamois (Rupicapra rupicapra) skulls of known sex from Serbia. The aim of this study was to investigate the degree of horn curvature that characterizes each sex and devise a methodology for using horn shape to determine sex. We observed a grouping pattern that exactly corresponded to each sex by analyzing Fourier transformed and normalized outline data with holding sexes unknown by exploratory cluster and discriminant analyses. Curvature was the most important determinant of chamois horn shape, and females were found to have less curved horns than males. Horn size was also a significant factor contributing to sexual dimorphism, whereas allometric scaling was similar in both sexes. We argue that horn growth is characterized by elongation of the horn axis in females and increasing curvature in males, and that these processes are constrained to later years of individual's life when the overall horn size changes very little. Our conclusions fit well with published data on chamois social structure and behavior suggesting that selective pressure acting on horn shape changed with increasing levels of sexual size dimorphism.

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Sexual dimorphism of pyrenean chamois (<i>Rupicapra p. pyrenaica</i>) based on skull morphometry

Cited by 8 publications

References 0 publications

Anatomy of the Skull of Saanen Goat. An anesthesiology and Stereology Approach

Anatomy of the Skull of Saanen Goat. An anesthesiology and Stereology Approach

Even mortality patterns of the two sexes in a polygynous, near‐monomorphic species: is there a flaw?

Sexual shape dimorphism in Alpine chamois (Rupicapra rupicapra) horns: how horn curvature could be used in sex identification?

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