Plastral shape isometry in Western Hermann's tortoise (Testudo hermanni hermanni)


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.


- Bertolero, A., Carretero, M.A., Llorente, G.A. (2005). An assessment of the reliability of growth rings counts for age determination in the Hermann’s tortoise Testudo hermanni. Amphibia-Reptilia 26:17-23.
- Castanet, J., Cheylan, M. (1979). Les marques de croissance des os et des écailles comme indicateur de l’age chez Testudo hermanni et Testudo graeca (Reptilia, Chelonia, Testudinidae). Canadian Journal of Zoology 57:1649-1655.
- Crampton, J. S. (1995). Elliptic Fourier shape analysis of fossil bivalves: some practical considerations. Lethaia 28:179-186.
- Forlani, A., Crestanello, B., Mantovani, S., Livoreil, B., Zane, L., Bertorelle, G., Congiu, L. (2005). Identification and characterization of microsatellite markers in Hermann's tortoise (Testudo hermanni, Testudinidae). Molecular Ecology Notes 5:228-230.
- Fritz, U., Auer, M., Bertolero, A., Cheylan, M., Fattizzo, T., Hundsdorfer, A.K., Sampayo, M.M., Pretus, J.L., Siroky, P., Wink, M. (2006). A rangewide phylogeography of Hermann’s tortoise, Testudo hermanni (Reptilia: Testudines: Testudinidae): Implications for taxonomy. Zoologica Scripta 35:531-543.
- Gasc, J.-P., Cabela, A., Crnobrnja-Isailovic, J., Dolmen, D., Grossenbacher, K., Haffner, P., Lescure, J., Martens, H., Martinez Rica, J. P., Maurin, H., Oliveira, M. E., Sofianidou, T. S., Veith, M. and Zuiderwijk, A. (eds.) (1997). Atlas of amphibians and reptiles in Europe. Societas Europea Herpetologica and Museum National d'Histoire Naturelle (IEGB/SPN), Paris.
- Hammer, Ø., Harper, D.A.T., Ryan, P.D. (2001). PAST: paleontological statistics software package for education and data analysis. Palaeontologia Electronica 4:1-9.
- Iwata, H., Ukai, Y. (2002). SHAPE: a computer program package for quantitative evaluation of biological shapes based on elliptic Fourier descriptors. Journal of Heredity 93:384-385.
- Kuhl, F. P., Giardina, C. R. (1982). Elliptic Fourier features of a closed contour. Computer graphics and image processing 18:236-258.
- Lestrel, P.E. (1997). Fourier Descriptors and their applications in Biology. Cambridge Univ. Press. United Kingdom, p. 466.
- Mirimin, L., Vernesi, C., Bertolucci, C., Mazzotti, S., Bertorelle, G. (2004). Mitochondrial dna variation and divergence in three Hermann's tortoise (Testudo hermanni) populations, Italian Journal of Zoology 71:S2:199-201.
- Rohlf, F.J., Archie, J.W. (1984). A comparison of Fourier methods for the description of wing shape in mosquitoes (Diptera: Culicidae). Systematic Zoology 3:302-317.
- Stubbs, D., Swingland, I.R. (1985). The ecology of a Mediterranean tortoise (Testudo hermanni): a declining population. Canadian Journal of Zoology 63:169-180.
- Younker, J.L., Ehrlich, R. (1977). Fourier biometrics: harmonic amplitudes as multivariate shape descriptors. Systematic Biology 26:336-342.
How to Cite
PARÉS-CASANOVA, Pere M.. Plastral shape isometry in Western Hermann's tortoise (Testudo hermanni hermanni). Advanced Science Journal of Zoology, [S.l.], v. 1, n. 1, p. 17-19, jan. 2016. Available at: <>. Date accessed: 19 aug. 2017.
Original Articles


allometric changes, isometric changes, plastral pigmentation pattern, plastron, Testudininidae