Chueva A., Gelashvili D., Yakimov V., Bragazin A., Mukhanov A. Сomprehensive craniological analysis of geographically remote muskrat populations (Ondatra zibethicus Linnaeus, 1766) // Principy èkologii. 2020. № 1. P. 121‒135. DOI: 10.15393/j1.art.2020.9342


Issue № 1

Original research

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Сomprehensive craniological analysis of geographically remote muskrat populations (Ondatra zibethicus Linnaeus, 1766)

Chueva
   Anna Viktorovna
Lobachevsky State University of Nizhny Novgorod, anvchueva@gmail.com
Gelashvili
   David Bezhanovich
Lobachevsky State University of Nizhny Novgorod, ecology@bio.unn.ru
Yakimov
   Vasily Nikolaevich
Lobachevsky State University of Nizhny Novgorod, damselfly@yandex.ru
Bragazin
   Alexander Andreevich
Lobachevsky State University of Nizhny Novgorod, abragazin73@yandex.ru
Mukhanov
   Alexey Valeryevich
Lobachevsky State University of Nizhny Novgorod, muav2@yandex.ru
Keywords:
digital 3D-model of the skull
geometric morphometry
fluctuating asymmetry
Nizhny Novgorod Volga region
South Kazakhstan
Summary: In this article, a comprehensive craniological analysis of two geographically remote muskrat populations (Ondatra zibethicus Linnaeus, 1766) was carried out. The research material was samples of muskrat skulls from two geographical populations more than 2000 km away from each other: the vicinity of the village of Aristovo, Semenovsky district, Nizhny Novgorod region and the valley of the Ili River, Balkhash district of the Republic of Kazakhstan. A standard craniometric analysis of the samples from Nizhny Novgorod and Kazakhstan revealed inter-population differences in only one of eight linear measurements (the length of the incisive foramen). The analysis of skull shape based on digital 3D-models revealed inter-population differences in the symmetric component of the form. The analysis of the asymmetric component of the skull form revealed the presence of both fluctuating and directional asymmetry. At the same time the fluctuating asymmetry is about 10 times higher than the directional one. Procrustes ANOVA based on the asymmetric component of muskrat skull shape revealed that that directional asymmetry, in contrast to fluctuating asymmetry, is characterized by inter-population specificity, that is, muskrat skulls in different populations deviate differently from strict bilateral symmetry. At this stage of research, it is impossible to find out whether this specificity has an adaptive value or is the result of isolation and genetic-automatic processes. The obtained results complement our understanding of the processes of morphological adaptation in muskrat populations as an introduced species.

© Petrozavodsk State University

Received on: 29 July 2019
Published on: 12 March 2020

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