Plastral pigmentation symmetries in Western Hermann's tortoise (Testudo hermanni hermanni)
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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 either landmarks or previous knowledge about the shape variation of the objects under study; it can visualize the contour of information and reconstruct the original shape; it can be mathematically normalized to size, rotation and starting point of the contour trace; and it can be conducted automatically using computer software. Hence, the variation can be decomposed into several mutually independent quantitative characteristics. In this manner, unacceptable errors based only on human visual judgment of shape, which is frequently deceptive and misled by size factors, can be effectively eliminated. In this study, we applied an elliptic Fourier analysis (EFA) to assess pigmentation pattern symmetries of plastron (ventral shell) of 52 western Hermann's tortoises (Testudo hermanni hermanni) studied from private breeders, and belonging to two different Mediterranean populations: Albera (Catalonia, NE Iberian Peninsula, n=14) and Balearic Islands (n=38). Low coefficients of regression appeared between carapace length and symmetrical and asymmetrical components. Based on this sample, it was shown that plastral pigmentation design does not present differences for either the symmetrical or the asymmetrical component. These results provide a baseline for further comparisons in variation of plastral pigmentation pattern based on EFA.
Is part ofEuropean Journal of Zoological Research, 2015, vol. 4, núm. 1, p. 46-51
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Parés Casanova, Pere-Miquel; Miralles Bover, Héctor (ASD, 2016-01-01)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 ...
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. ...
Estudio de la variabilidad del patron cromático plastral en Testudo hermanni hermanni Gleim, 1789 mediante elípticas de Fourier Miralles Bover, Héctor (2015)La Tortuga mediterrània (Testudo hermanni) està àmpliament distribuïda a Europa Occidental i Meridional. Com la majoria dels rèptils exhibeix una forta variació morfològica al llarg de la seva distribució geogràfica, així ...