ISSN 10674136, Russian Journal of Ecology, 2010, Vol. 41, No. 6, pp. 535–538. © Pleiades Publishing, Ltd., 2010.
Original Russian Text © M.A. Fominykh, E.A. Markova, A.V. Borodin, Yu.A. Davydova, 2010, published in Ekologiya, 2010, No. 6, pp. 468–471.
Dental characteristics are widely used in the study
of evolutionary and ecological aspects of intraspecific
variation in rodents (Bol’shakov et al., 1980; Chaline
et al., 1999; Borodin, 2009; Olenev, 2009; etc.). At the
same time, differences in sex–age population struc
ture, recorded in different seasons and phases of pop
ulation cycles, may provide for morphological hetero
geneity of samples in species with wellmanifested age
variation, such as the bank vole (
Schreber, 1780). Since the shape of molars in this spe
cies markedly changes with age due to tooth wear
(Borodin, 2009), heterogeneity of age population
structure may have a significant effect on the results of
intraspecific comparisons (Borodin et al., 2006),
including comparisons between animals sampled from
the same population in different seasons (Gue
et al., 2009).
The purpose of this study was to reveal patterns of
variation in odontometric characters of the bank vole,
with regard to differences in the sex–age structure of
populations in different seasons (spring, summer,
autumn) and at different phases of the population
cycle (depression, growth, peak).
The material was collected from 2001 to 2006 in the
Visim State Biosphere Reserve (the southern dark
coniferous taiga subzone of the Middle Urals,
E), in a stationary plot laid in a fir–spruce for
est. A total of 432 voles were examined (Table 1).
To characterize odontometric variability, we used
18 metric characters of the first lower molar (Fig. 1).
Measurements accurate to 0.01 mm were made in dig
ital images taken with a Nikon Coolpix 5100 digital
camera at constant
magnification of a Carl Zeiss
C2000 stereomicroscope, using the TPS program
The relative age of voles was estimated from the
ontogenetic stages of the first lower molar (m1), which
were distinguished based on the extent to which the
Intrapopulation Variation in Odontometric Characters of the Bank
Schreber, 1780 in the Middle Urals
M. A. Fominykh, E. A. Markova, A. V. Borodin, and Yu. A. Davydova
Institute of Plant and Animal Ecology, Ural Division, Russian Academy of Sciences,
ul. Vos’mogo Marta 202, Yekaterinburg, 620144, Russia
Received April 2, 2010
, odontometric characters, variation, season, phases of the population cycle.
Sex (males/females) and age (based on ontogenetic stages) structure of samples of
in different seasons
and phases of population cycles (trapping date)*, specimens
spring–summer–autumn spring–summer–autumn spring–summer–autumn
3 0/0–0/1–0/0 0/0–0/1–0/0 0/0–3/2–0/0
4 0/0–2/1–0/0 0/0–1/0–0/0 0/0–3/4–0/0
5 0/0–7/12–0/2 0/0–1/1–2/1 0/0–14/2–6/7
6 0/0–1/18–13/14 0/0–1/2–0/0 1/0–15/2–18/5
7 0/0–0/0–32/23 0/0–1/2–1/1 2/3–6/12–10/5
8 0/0–0/0–8/2 0/0–0/0–0/2 1/0–2/5–7/9
9 18/23–1/1–1/0 1/1–0/0–0/0 5/2–0/0–0/0
10 7/12–10/6–8/7 1/0–0/0–0/0 9/3–2/2–0/0
11 3/1–5/1–4/2 1/0–0/0–0/0 0/0–3/1–0/0
* Phases of population cycles are recognized according to Kshnyasev and Davydova (2005).