Summary
The evolutionary stability of the female-biased sex ratio observed in the wood lemming (Myopus schisticolor) is discussed. The hypothesis analysed is that the skewed sex ratio is maintained as a result of partial and/or recurrent inbreeding. Fredga et al. (1976, 1977) have suggested that an X-linked mutant gene, X*, affects the male-determining action of the Y chromosome, thus converting some XY individuals into females. By a mechanism of selective non-disjunction in the foetal ovary only X*-carrying eggs are produced. In particular the stability of that genetic mechanism (or the X* chromosome) is analysed by considering the introduction of a “suppressing” sex-linked mutant gene Y*. Several deterministic simulation models assuming father-daughter and/or brother-sister matings have been developed and analysed. It is concluded that in the case of extremely strong inbreeding, the hypothesised genetic mechanism may, as a result, be evolutionarily stable. Interpreting field observations on microtine rodents in general it is concluded that only a few species are likely to experience such extreme cases of inbreeding. The wood lemming and the related collared lemming (Dicrostonyx troquatus), another case which seems to have XY-females, are likely to exhibit sufficiently strong inbreeding.
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Batzli, G O. 1975. The role of the small mammals in arctic ecosystems. In Small Mammals: Their Productivity and Population Dynamics, eds. F. B. Golby, K. Petrusewicz, and L. Ryszkowski, pp. 243–268. Camb. Univ. Press, Cambridge.
Batzli, G O, Stenseth, N C, and Fitzgerald, B M. 1974. Growth and survival of suckling brown lemmings, Lemmus trimucronatus. J Mammal, 55, 828–831.
Bengtsson, B-O. 1977. Evolution of sex ratio in the wood lemming. In Measuring Selection in Natural Populations, eds. F. B. Christiansen and T. M. Fenchel, pp. 333–343. Springer Verlag.
Fisher, R A. 1930. The Genetical Theory of Natural Selection, 272 pp. Clarendon Press.
Fredga, K, Gropp, A, Winking, H, and Frank, F. 1976. Fertile XX- and XY-type females in the wood lemming Myopus schisticolor. Nature, 261, 225–227.
Fredga, K, Gropp, A, Winking, H, and Frank, F. 1977. A hypothesis explaining the exceptional sex ratio in the wood lemming (Myopus schisticolor). Hereditas, 85, 101–104.
Gileva, E A, and Lobanova, N A. 1974. Complex chromosome variation in arctic lemming and taxonomy of the genus Dicrostonyx. Proc 1st Int Theriolog Congr, Moscow, 1, 191–192.
Hamilton, W D. 1967. Extraordinary sex ratios. Science, 156, 447–488.
Ilmén, M, and Lahti, S. 1968. Reproduction, growth and behaviour in the captive wood lemming, Myopus schisticolor (Lilljeb.). Ann Zool Fennici, 5, 207–219.
Kalela, O, and Oksala, T. 1966. Sex ratio in the wood lemming, Myopus schisticolor (Lilljeb.), in nature and in captivity. Ann Univ Turkuensis, Ser AII, 37, 1–24.
Kowalski, K. 1977. Fossil lemmings (Mammalia, Rodentia) from the Pliocene and early Pleistocene of Poland. Acta Zool Cracov, 22, 279–317.
Krebs, C J, and Myers, J H. 1974. Population cycles in small mammals. Adv Ecol Res, 8, 269–399.
Lidicker, W Z, Jr. 1973. Regulation of number in an island population of California vole: a problem in community dynamics. Ecol Mongr, 43, 271–302.
Myllymäki, A. 1977. Demographic mechanisms in the fluctuating populations of the field vole Microtus agrestis. Oikos, 29, 468–493.
Ognev, S I. 1963. Mammals of the USSR and Adjacent Countries, Vol. 6, Rodents. Israel Program for Scientific Translations.
Rausch, R L, and Rausch, V R. 1972. Observations on chromosomes of Dicrostonyx torquatus stevensoni Nelson and chromosomal diversity in varying lemmings. Z Säugertierkunde, 37, 372–384.
Stenseth, N C. 1978. Is the female-biased sex ratio in wood lemming Mycopus schisticolor maintained by cyclic inbreeding? Oikos, 30 (in press).
Stenseth, N C, Hansson, I, Myllymäki, A, Andersson, M, and Katila, J. 1977. General models for the population dynamics of the field vole Microtus agrestis in Central Scandinavia. Oikos, 29, 616–642.
Wachtel, S S, Koo, G C, Ohno, S, Gropp, A, Dev, V G, Tantravahi, R, Miller, D A, and Miller, O J. 1976. H-4 antigen and the origin of X4 female wood lemmings (Myopus schisticolor). Nature, 264, 638–639.
Whitney, P H. 1973. Population biology and energetics of three species of small mammals in the taiga of interior Alaska, 254 pp. Ph.D. thesis, Univ. of Alaska.
Wood, R J, and Newton, M E. 1976. Meiotic drive and sex ratio distortion in the mosquito Aedes aegypti. Proc Int Congr Ent, pp. 97–105.
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Smith, J., Stenseth, N. On the evolutionary stability of the female-biased sex ratio in the wood lemming (Myopus schisticolor): the effect of inbreeding. Heredity 41, 205–214 (1978). https://doi.org/10.1038/hdy.1978.89
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DOI: https://doi.org/10.1038/hdy.1978.89
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