Summary
The actively speciating four chromosomal species of fossorial mole rats of the Spalax ehrenbergi complex in Israel (2n=52, 58, 54 and 60) which inhabit an increasingly arid environment in this order were tested to determine their habitat preference. The testing apparatus simulated four climatic regimes based on temperature and humidity combinations corresponding to the climatic origins of the four chromosomal species: coolhumid, cool-dry, warm-humid and warm-dry, respectively. The tests involved 175 adults comprising all four chromosome species and representing 10 populations. Out of the 139 analyzed animals 88% selected the warm cages and only 12% selected the cool cages. The four karyotype progressively preferred the warm-dry cage in the following order: 53, 59, 60 and 72% for 2n=58, 52, 54 and 60 respectively, largely in accord with their increasingly arid climatic origins. Even larger differences were found in populations within karyotypes in accord with the local climatic variation within a karyotype range.
The results of our analysis indicate that the chromosomal species and populations select their climatic habitat in accord with the climatic conditions of their geographic localities. The humidity index appears to be the prime differentiator of habitat selection and may have been a substantial ecological factor in species differentiation and distribution of the Spalax ehrenbergi complex in Israel.
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References
Atlas of Isreael. Pub. Dept. Surveys Ministry of Labour, Bialik Institue, and Jewish Agency (1970)
Bush, G.L., Case, S.M., Wilson, A.C., Patton, J.L.: Rapid speciation and chromosomal evolution in mammals. Proc. Natl. Acad. Sci. USA 74, 3942–3946 (1977)
Kennerly, T.E.: Microenvironmental conditions of the pocket gopher burrow. Texas J. Sci. 16, 395–441 (1964)
Lemen, C.A., Rosenzweig, M.L.: Microhabitat selection in two species of heteromyid rodents. Oecologia (Berl.) 33, 127–135 (1978)
MacArthur, R.H., Levins, R.: Competition, habitat selection and character displacement in a patchy environment. Proc. Natl. Acad. Sci. USA 51, 1207–1210 (1964)
McNab, B.K.: The metabolism of fossorial rodents: A study of convegence. Ecology 47, 712–733 (1966)
Miller, R.S.: Ecology and distribution of pocket gophers (Geomyidae) in Colorado. Ecology 45, 256–272 (1964)
Nevo, E.: Observations on Israeli populations of the mole rat Spalax e. ehrenbergi Nehring 1989. Mammalia 25, 127–144 (1961)
Nevo, E.: Mole rat Spalax ehrenbergi: Mating behavior and its evolutionary significance. Science 163, 484–486 (1969)
Nevo, E.: Variation and evolution in the subterranean mole rat, Spalax. Israel J. Zool. 22, 207–208 (1973)
Nevo, E.: Adaptive convergence and divergence of subterranean mammal. Ann. Rev. Ecol. and Syst. (1979)
Nevo, E., Shaw, C.: Genetic variation in a subterranean mammal. Biochem. Genet. 7, 235–241 (1972)
Nevo, E., Shkolnik, A.: Adaptive metabolic variation of chromosome forms in mole rats, Spalax. Experientia 30, 724–726 (1974)
Nevo, E., Sarich, V.: Immunology and evolution in the mole rat, Spalax. Israel J. Zool. 23, 210–211 (1974)
Nevo, E., Naftali, G., Guttman, R.: Aggression patterns and speciation. Proc. Natl. Acad. Sci. USA 72, 3250–3254 (1975)
Nevo, E., Bar El, H.: Hybridization and speciation in fossorial mole rats. Evolution 30, 831–840 (1976)
Nevo, E., Heth, G.: Assortative mating between chromosome forms of the mole rat, Spalax ehrenbergi. Experientia 32, 1509–1512 (1976)
Nevo, E., Heth, G., Bodmer, M.: Olfactory discrimination as an isolating mechanism in speciating mole rats. Experientia 32, 1511–1512 (1976)
Nevo, E., Cleve, H.: Genetic differentiation during speciation. Nature 275, 125–126 (1978)
Nevo. E., Tchernov, E.: Morphological variation and phenetic distances among four karyotypes of Spalax ehrenbergi (MS, unpublished)
Rosenzweig, M.: On the evolution of habitat selection. Proc. Ist Intern Cong. Ecology, pp. 401–404 (1974)
Saviè, I.R., Soldatoviè, B.: Contribution to the knowledge of the genus Spalax (Microspalax) karyotype from Asia Minor. II Intern Cong. Ther. Brno (1978)
Tchernov, E.: Succession of rodent faunas during the Upper Pleistocene of Israel. Mammalia depicta Hamburg and Berlin, Verlag Paul Parey, pp. 152 (1968)
Thornthwaite, C.W.: An approach toward a rational classification of climate. Georg. Rev. 38, 55–94 (1948)
Wahrman, J., Goitein, R., Nevo, E.: Mole rat Spalax: Evolutionary significance of chromosome variation. Science 164, 82–84 (1969)
White, M.J.D.: Modes of speciation. San Francisco: W.H. Freeman and Co. 455 pp. (1978)
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Nevo, E., Guttman, R., Haber, M. et al. Habitat selection in evolving mole rats. Oecologia 43, 125–138 (1979). https://doi.org/10.1007/BF00344766
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DOI: https://doi.org/10.1007/BF00344766