Abstract
Non-invasive age estimation is critically important for many field studies but often it represents a significant challenge. In rodents, upper incisors represent a part of a cranium which can be readily measured in an alive animal. We propose an age estimation method based on the measurements of both upper incisors’ width (IW) for a subterranean rodent, Ellobius tancrei. The IW measurements for 77 laboratory-born females and 81 males were fitted, separately for the sexes, by sigmoidal Gompertz growth functions to obtain the asymptotic values. Based on the data set encompassing pre-asymptotic ages, we then derived a polynomial regression model with log-transformed age as а predictor. The analysis revealed no statistically significant sex difference in growth patterns. Derived model explained 91% of IW variation and was used to obtain predicted values of age and their 95% prediction intervals through inverse calculations. We conclude that IW is a potentially useful age indicator for mole voles and possibly other rodents in cases when invasive or time-consuming methods are non-appropriate.
Acknowledgments
We are grateful to A. Rychkova for her help with maintenance of the animals. The critical comments of associate editor B. Kryštufek and three reviewers helped to improve the article. We thank A. Malenkov for language editing. This study was supported by the Russian Foundation of Basic Research [project 16-04-00479a].
References
Ai-Qing, L., J. Long-Ru, L. Ying, S. Ke-Ping and F. Jiang. 2010. Postnatal growth and age estimation in horsfield’s leaf-nosed bat, Hipposideros larvatus. Zool. Stud. 49: 789–796.Search in Google Scholar
Balèiauskienë, L. 2007. Cranial growth of captive bred common voles (Microtus arvalis). Acta Zool. Litu. 17: 220–227.10.1080/13921657.2007.10512835Search in Google Scholar
Brown, E.B.III. 1973. Changes in patterns of seasonal growth of Microtus pennsylvanicus. Ecology 54: 1103–1110.10.2307/1935576Search in Google Scholar
Canty, A. and B. Ripley. 2017. boot: Bootstrap R (S-Plus) functions. R package version 1.3–1.9. Available: https://CRAN.R-project.org/package=boot (accessed 10 September 2017).Search in Google Scholar
Cook, R.D. 1979. Influential observations in linear regression. J. Am. Statistical Association 74: 169–174.10.1080/01621459.1979.10481634Search in Google Scholar
Dalgaard, P. 2008. Introductory statistics with R. Springer (2nd Ed.). Springer, New York.10.1007/978-0-387-79054-1Search in Google Scholar
Dapson, R.W. 1980. Guidelines for statistical usage in age-estimation technics. J. Wildl. Manage. 44: 541–548.10.2307/3808001Search in Google Scholar
Davison, A.C. and D.V. Hinkley. 1997. Bootstrap methods and their applications. Cambridge University Press, Cambridge. pp. 594.Search in Google Scholar
Davydov, G.S. 1988. Fauna Tadjikskoi SSR. Mlekopitajuschie (Gryzuny). Donish, Dushanbe. pp. 313 (In Russian).Search in Google Scholar
Elangovan, V., E.Y.S. Priya, H. Raghuram and G. Marimuthu. 2003. Postnatal development in the Indian short-nosed fruit bat Cynopterus sphinx: growth rate and age estimation. Acta Chiropterol. 5: 107–116.10.3161/001.005.0110Search in Google Scholar
Evdokimov, N.G. 2001. Population ecology of the mole-vole. Izdatel’stvo Ekatherinburg, Ekatherinburg. pp. 144 (In Russian).Search in Google Scholar
Fuller, W.A. 1988. Is weight a reliable to age in Microtine rodents? Acta Theriol. 33: 247–261.10.4098/AT.arch.88-19Search in Google Scholar
Garel, M., J.M. Gaillard, T. Chevrier, J. Michallet, D. Delorme and G. Laere. 2010. Testing reliability of body size measurements using hind foot length in roe deer. J. Wildl. Manage. 74: 1382–1386.10.1111/j.1937-2817.2010.tb01261.xSearch in Google Scholar
Greenwell, B.M. and C.M. Schubert Kabban. 2014. Investr: an R package for inverse estimation. R J. 6: 90–100.10.32614/RJ-2014-009Search in Google Scholar
Huin, N. and P.A. Prince. 2000. Chick growth in albatrosses: curve fitting with a twist. J. Avian Biol. 31: 418–425.10.1034/j.1600-048X.2000.310318.xSearch in Google Scholar
Kaya, A. and Y. Coşkun. 2015. Reproduction, postnatal development, and social behavior of Ellobius lutescens Thomas, 1897 (Mammalia: Rodentia) in captivity. Turk. J. Zool. 39: 425–431.10.3906/zoo-1401-73Search in Google Scholar
Klevezal, G.A. 2007. Printsipy i metody opredeleniya vozrasta mlekopitayushchih. Tovarishchestvo nauchnyh izdaniy KMK, Moskva. pp. 283 (In Russian).Search in Google Scholar
Krämer, W. and H. Sonnberger. 1986. The linear regression model under test. Physica – Verlag, Heidelberg, Germany. pp. i–ix+189.10.1007/978-3-642-95876-2Search in Google Scholar
Lammers, A.R., H.A. Dziech and R.Z. German. 2001. Ontogeny of sexual dimorphism in Chinchilla lanigera Rodentia: Chinchillidae. J. Mammal. 82: 179–189.10.1093/jmammal/82.1.179Search in Google Scholar
Letitskaya, E.P. 1984. Materials on reproduction and postnatal development of Ellobius talpinus (Rodentia, Cricetidae). Zool. Zh. 63: 1084–1089 (In Russian).Search in Google Scholar
Lidicker, W.Z., J.R. MacLean and S.F. MacLean. 1969. A method for estimating age in the California vole, Microtus californicus. Am. Midl. Nat. 82: 450–470.10.2307/2423790Search in Google Scholar
Morris, P. 1972. A review of mammalian age determination methods. Mammal Rev. 2: 69–104.10.1111/j.1365-2907.1972.tb00160.xSearch in Google Scholar
Novikov, E. 2007. Frugal strategy as a base of mole-vole (Ellobius talpinus: Rodentia) adaptations to the fossorial way of life. Zh. Obshch. Biol. 68: 267–275 (In Russian).Search in Google Scholar
Novikov, E., I. Zadubrovskaya, P. Zadubrovskiy and T. Titova. 2017. Reproduction, ageing, and longevity in two species of laboratory rodents with different life histories. Biogerontology. 18: 803–809.10.1007/s10522-017-9723-7Search in Google Scholar
Petrovski, D.V., E.A. Novikov, J.T. Burns and M.P. Moshkin. 2010. Wintertime loss of ultradian and circadian rhythms of body temperature in the subterranean euthermic mole vole, Ellobius talpinus. Chronobiol. International 27: 879–887.10.3109/07420521003786792Search in Google Scholar
Pinheiro, J.C. and D.M. Bates. 2000. Mixed-Effects Models in S and S-PLUS. Springer, New York.10.1007/978-1-4419-0318-1Search in Google Scholar
R Core Team. 2017. R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. Available: https://www.R-project.org (accessed 10 September 2017).Search in Google Scholar
Royston, P. 1995. Remark AS R94: a remark on algorithm AS 181: the W test for normality. Appl. Stat. 44: 547–551.10.2307/2986146Search in Google Scholar
RStudio. 2016. RStudio: Integrated development environment for R (Version 0.99.903). Boston, MA. Available: http://www.rstudio.org (accessed 10 September 2017).Search in Google Scholar
Sherfy, M.H., T.A. Mollett, K.R. McGowan and S.L. Daugherty. 2006. A reexamination of age-related variation in body weight and morphometry of Maryland nutria. J. Wildl. Manage. 70: 1132–1141.10.2193/0022-541X(2006)70[1132:AROAVI]2.0.CO;2Search in Google Scholar
Slastenina, E.S. 1963. The ecology and harmful activity of Ellobius talpinus on the fields and pastures of Kirgiziya. Uch Zap Tyumenskogo Gos Pedagog Inst 24: 3–64 (In Russian).Search in Google Scholar
Smorkatcheva, A.V. and A.R. Kumaitova. 2014. Delayed dispersal in the Zaisan mole vole (Ellobius tancrei): helping or extended parental investment? J. Ethol. 32: 53–61.10.1007/s10164-013-0392-ySearch in Google Scholar
Smorkatcheva, A.V. and K.V. Kuprina. 2018. Does sire replacement trigger plural reproduction in matrifilial groups of a singular breeder, Ellobius tancrei? Mammal. Biol. 88: 144–150.10.1016/j.mambio.2017.09.005Search in Google Scholar
Young, A.J. and N.C. Bennett. 2010. Morphological divergence of breeders and helpers in wild Damaraland mole-rat societies. Evolution 64: 3190–3197.10.1111/j.1558-5646.2010.01066.xSearch in Google Scholar PubMed
Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/mammalia-2017-0163).
©2019 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
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Articles in the same Issue
- Frontmatter
- Conservation
- The conservation status of a poorly known range-restricted mammal, the Nimba otter-shrew Micropotamogale lamottei
- Ecology
- Contribution to the knowledge of the rare “Famatina tuco-tuco”, Ctenomys famosus Thomas 1920 (Rodentia: Ctenomyidae)
- Social structure and reproduction of long-tailed porcupine (Trichys fasciculata)
- Feeding strategy of two rodent species in a set-aside field and its influence on alimentary tract morphometry
- Feeding ecology of the marsupial Thylamys macrurus (Olfers 1818) (Mammalia, Didelphidae) in woodland patches of Cerrado, central-western Brazil
- New trophic link and potential feeding area of dwarf minke whale (Balaenoptera acutorostrata subsp.) in mid latitude waters of the southwestern Atlantic Ocean
- The use of acoustic detectors for assessing bat species richness and functional activity in a South African National Park
- Noninvasive age estimation in rodents by measuring incisors width, with the Zaisan mole vole (Ellobius tancrei) as an example
- Difficulty in visual sex identification: a case study on bank voles
- A survey of the vulnerable Cuvier’s gazelle (Gazella cuvieri) in the mountains of Ait Tamlil and Anghomar, Central High Atlas of Morocco
- Ethology
- Into the light: atypical diurnal foraging activity of Blyth’s horseshoe bat, Rhinolophus lepidus (Chiroptera: Rhinolophidae) on Tioman Island, Malaysia
- Biogeography
- Persian leopard and wild sheep distribution modeling using the Maxent model in the Tang-e-Sayad protected area, Iran
- First record of Little Indian field mouse, Mus booduga (Gray 1837) (Rodentia: Muridae), from cold arid region of Leh-Ladakh, Jammu and Kashmir, India
- Taxonomy/phylogeny
- Partial and complete leucism in two Abrothrix species (Rodentia: Cricetidae) from central Chile