The second approach (namely, comparison of baibacina and sibirica as that were identified in the field), in spite of considerable morphological variability of animals under studing, has shown that differences between above forms are statistically significant, and discrimination can be done with high probability on base both measurments and structure pattern. Analysis of dimensional characters variability within each form permited to reveal rather obvious geographical component. At the same time, investigation of quantitative characters' diversity appeared to be most informative for the examination of interpopulation interrelations. So, populations of sibirica, in accordance with some features of zygomatic arch and palate, form row from Darigang marmots to Khangai and Tuva ones.
Among baibacina the form centralis is readily distinguished. Significantly, baibacina from the zone of overlap with sibirica is sharply distinct, in respect of palate and zygomatic arch's structure, from other Altai marmots being at the same time similar to sibirica from Khangai and Tuva. From the other hand, sibirica from the same contact zone blend with morphological series of marmots from Mongolian and Gobi Altai.
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