Plastral shape isometry in Western Hermann's tortoise (Testudo hermanni hermanni)
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Elliptical Fourier Analysis is a good technique for characterizing the shape of complex biological and non-biological morphologies. The current investigation aimed to study plastral pigmentation contour (black areas of the ventral shell) changes, according to body size (plastral length), in Western
Hermann's tortoise (Testudo hermanni hermanni), using Elliptical Fourier Analysis. For this goal, 52 domestic pure tortoises from authorized private breeders were selected, ventral pictures were individually taken and their contour automatically digitized and straight-line plastron length obtained. Straight-line plastron length ranged from 83.6 to 150.6 mm (for males) and from 78.9 to 171.8 mm (for females). A regression was performed for second and third harmonics as dependent variables, against plastral length (log transformed) as independent variable. Based on this sample, it is demonstrated that plastral pigmentation design does not change along animals' life-history. Therefore, a plastral pigmentation shape isometry can be supposed, at least for this subspecies.
Is part ofAdvanced Science Journal of Zoology, 2016, vol. 1, núm. 1, p. 17-19
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Parés Casanova, Pere-Miquel; Miralles Bover, Héctor (Scholars Research Library, 2015-01-01)Shape is a fundamental morphological descriptor, one method of its estimation being from digitally processed images. Elliptic Fourier method is an outline-based morphometrics that has some advantages: it does not require ...
Elliptic Fourier analysis of plastral pigmentation patterns in two populations of Western Hermann's tortoise (Testudo hermanni hermanni) Parés Casanova, Pere-Miquel (The Biosciences Reseach Publisher, 2015-02-03)Testudo hermanni) is widely distributed in western and southern Europe. As reptiles exhibit strong geographical variation in most morphological, as well as life history traits, gathering data from distant areas is important. ...
Adaptative directional asymmetric shape in Testudo hermanni hermanni Gmelin, 1789 (Reptilia: Testudines: Testudinidae) Parés Casanova, Pere-Miquel; Cladera, Margalida; Martínez Silvestre, Albert (Societas Europaea Herpetologica (SEH), 2019-07-09)Asymmetries consist of deviations from perfect symmetry. If the variation is normally distributed around a mean of zero, fluctuating asymmetry is present; when the variation is normally distributed around a mean that is ...