abstract |
The article presents the results of a comprehensive craniological analysis of the common raccoon dog (Nyctereutes procyonoides Gray 1834) based on adult skulls from four samples, three of which comprise materials from Ukraine: 1) central and northern oblasts of Ukraine (Kyiv, Chernihiv, and Cherkasy oblasts); 2) eastern oblasts of Ukraine (Luhansk, Zaporizhzhia, and Poltava oblasts); 3) southern oblasts of Ukraine (Kherson Oblast). Additionally, a sample that includes materials from the native range of the species (Khabarovsk Krai, Primorsky Krai, and Chita Oblast of Russia) was also analysed. The research included standard analysis based on craniometric measurements of 19 parameters, and analysis of the skull shape by tools of geometric morphometrics separately for the dorsal and ventral sides of the skull and the buccal surface of the left mandible. The total sample comprised 62 specimens. The results of the analysis of linear characters showed that specimens from the northern, central, and southern oblasts of Ukraine differ from those from the eastern oblasts of Ukraine and from specimens from the Far East, which are characterised by larger dimensions. The analysis of shape differences using MorphoJ demonstrates the greatest morphological distance between the samples from the territory of Ukraine and the sample from the species’ native range. The analysis of the dorsal and ventral surfaces of the skulls showed that the specimens from the native range of the common raccoon dog have more elongated and broader nasal bones, while the braincase is narrowed from the sides, but elongated towards the occipital bones. The greatest level of shape variation is characteristic of the mandible. Specimens from the territory of Ukraine have a more elongated mandibular ramus and a larger area of the coronal, articular, and angular processes, while skulls from the species’ native range have a larger angle between the mandibular ramus and the coronal process, which in turn has a greater inclination relative to the articular process and a smaller area of the angular process. Skull size is often larger in animals in introduced populations, but it also depends on environmental conditions, nutrition, and interspecific competition. |
references |
Anderson, M. J. 2001. A new method for non-parametric multivariate analysis of variance. Austral Ecology, 26: 32–46. https://doi.org/10.1111/j.1442-9993.2001.01070.pp.x
Ansorge, H., M. Ranyuk, K. Kauhala, R. Kowalczyk, N. Stier. 2009. Raccoon dog, Nyctereutes procyonoides, populations in the area of origin and in colonised regions — the epigenetic variability of an immigrant. Annales Zoologici Fennici, 46: 51–62. https://doi.org/10.5735/086.046.0106
Asahara, M. 2013. Shape variation in the skull and lower carnassial in a wild population of raccoon dog (Nyctereutes procyonoides). Zoological Science, 30 (3): 205–210. https://doi.org/10.2108/zsj.30.205
Asahara, M. 2014a. Shape variation in the skull within and between wild populations of the raccoon dog (Nyctereutes procyonoides) in Japan. Mammal Study, 39: 105–113. https://doi.org/10.3106/041.039.0206
Asahara, M. 2014b. Evolution of relative lower molar sizes among local populations of the raccoon dog (Nyctereutes procyonoides) in Japan. Mammal Study, 39: 181–184. https://doi.org/10.3106/041.039.0308
Haba, C., T. Oshida, M. Sasaki, H. Endo, H. Ichikawa, Y. Masuda. 2008. Morphological variation of the Japanese raccoon dog: implications for geographical isolation and environmental adaptation. Journal of Zoology, 274 (3): 239–247. https://doi.org/10.1111/j.1469-7998.2007.00376.x
Hammer, Ø., D. A. T. Harper, P. D. Ryan. 2001. PAST: Paleontological statistics software package for education and data analysis. Palaeontologia Electronica, 4 (1): a04.
Hidaka, S., M. Matsumoto, H. Hiji, S. Ohsako, H. Nishinakagawa. 1998. Morphology and morphometry of skulls of raccoon dogs, Nyctereutes procyonoides and badgers, Meles meles. Journal of Veterinary Medical Science, 60 (2): 161–167. https://doi.org/10.1292/jvms.60.161
Jurgelėnas, E., L. Daugnora. 2005. Osteometrical analysis of skulls in red foxes and raccoon dogs. Veterinarija ir zootechnika, 32(54): 11–15 [Lithuanian]
Kauchala, K., E. Helle. 1990. Age determination of the raccoon dog in Finland. Acta Theriologica, 35 (3–4): 321–329. https://doi.org/10.4098/AT.arch.90-37
Kim, S. I., S. Suzuki, G. Oh, D. Koyabu, T. Oshida, H. Lee, [et al.]. 2012. Sexual dimorphism of craniodental morphology in the raccoon dog Nyctereutes procyonoides from South Korea. Journal of Veterinary Medical Science, 74 (12): 1609–1616. https://doi.org/10.1292/jvms.12-0281
Kim, S. I., T. Oshida, H. Lee, M. S. Min, G. Kimura. 2015. Evolutionary and biogeographical implications of variation in skull morphology of raccoon dogs (Nyctereutes procyonoides, Mammalia: Carnivora). Biological Journal of the Linnean Society, 116: 856–872. https://doi.org/10.1111/bij.12629
Klingenberg, C. P., G. S. McIntyre. 1998. Geometric morphometrics of developmental instability: Analyzing patterns of fluctuating asymmetry with procrustes methods. Evolution, 52 (5): 1363–1375. https://doi.org/10.2307/2411306
Klingenberg, C. P. 2011. MorphoJ: an integrated software package for geometric morphometrics. Molecular Ecology Resources, 11: 353–357. https://doi.org/10.1111/j.1755-0998.2010.02924.x
Kolosov, A. M., N. P. Lavrov. 1968. Enrichment of the Сommercial Fauna of the USSR. Publishing ‘Forest industry’. Moskva, 1–256. [In Russian]
Korablev, N. P., E. Szuma. 2014. Variability of native and invasive raccoon dogs’ Nyctereutes procyonoides populations: looking at translocation from a morphological point of view. Acta Theriologica, 59: 61–79. https://doi.org/10.1007/s13364-012-0127-4
Korablev, N. P., M. P. Korablev, P. N. Korablev. 2012. Craniometrical variability of raccoon dog — Nyctereutes procyonoides Gray (Carnivora, Canidae) in Tver Region: from reintroducents to modern populations. Bulletin of Moscow Society of Naturalists, 117(1): 15–25. [Russian]
Korablev, N. P., E. Szuma, P. N. Korablev, A. V. Zinoviev. 2017. Dental polymorphism of the raccoon dog in indigenous and invasive populations: internal and external causation. Mammal Research, 62: 163–177. https://doi.org/10.1007/s13364-016-0293-x
Korablev, N. P., P. N. Korablev, M. P. Korablev. 2018. Microevolutionary Processes in Populations of Introduced Species: Eurasian Beaver, Common Raccoon Dog, American Mink. KMK, Moskva, 1–402. [Russian]
Lazariev, D., Z. Barkaszi. 2023. Craniological analysis of the muskrat (Ondatra zibethicus) from different river basins of Ukraine. Theriologia Ukrainica, 26: 71– 86. http://doi.org/10.53452/TU2608
Lazariev, D. 2024. Craniology of Neogale vison in areas of introduction: analysis of samples from Ukraine. Theriologia Ukrainica, 27: 36–47. http://doi.org/10.53452/TU2605
Nowicki, W., W. Brudnicki, B. Skoczylas. 2011. Studies of interdependences between characteristics in raccoon dog (Nyctereutes procyonoides Gray). Electronic Journal of Polish Agricultural Universities, 14 (2): art17.
Zagorodniuk, I., D. Lazariev. 2024. Dynamics of distribution of introduced mammals in Ukraine and factors influencing them. Biosystems Diversity, 32 (4): in press. https://doi.org/10.15421/012455 |
