Abstract
The sex ratio of a diploid–polyploid complex of spined loaches (Cobitis; Cobitidae) from Lake Müggelsee (Germany) was 1:22 in favour of the females. The percentage of males increased during three years of investigation from 2.9% to 10.6%. Within the years, male proportion changed significantly between the different dates of sampling. In laboratory, 50 specimens were reared from eggs in slightly warmer and softer water than in the lake. Since sex ratio was 1:24 in this group, the influence of environmental sex determination, hermaphroditism or sex selective mortality in the lake was assumed to be low. Erythrocyte measurements on 59 wild-caught specimens revealed a diploid–polyploid ratio of 1:7.4. The dominance of the polyploid sperm parasite was taken as the main reason for the observed unbalanced sex ratio. The absolute host-dependence of the parasitic polyploids demands a lower threshold value for male percentage, which should have been reached in spined loaches from Lake Müggelsee.
References cited
Bacescu, M. 1961. Contribution a la systematique du genre Cobitis desription d'un espece nouvelle, Cobitis calderoni, provenant de L'Espagne. Acad. R.P.R. Rev. Biol. 6: 435–448.
Balshine-Earn, S. 1996. Reproductive rates, operational sex ratios and mate choice in St. Peter's fish. Behav. Ecol. Sociobiol. 39: 107–116.
Bauch, G. 1954. Die einheimischen Süßwasserfische. Neumann, Radebeul & Berlin. 187 pp.
Benfey, T.J., A.M. Sutterlin & R.J. Thompson. 1984. Use of erythrocyte measurements to identify triploid salmonids. Can. J. Fish. Aquat. Sci. 41: 980–984.
Bohlen, J. 1999. Reproduction of spined loach, Cobitis taenia (Cypriniformes: Cobitidae) under laboratory conditions. J. Appl. Ichthyol. 15: 49–53.
Boroń, A. 1992. Karyotype study of diploid and triploid Cobitis taenia (Pisces, Cobitididae) fromVistula River basin. Cytobios 72: 201–206.
Boroń, A. 1994. Use of erythrocyte measurements to detect natural triploids of spined loach Cobitis taenia (L.). Cytobios 78: 197–202.
Canestrini, J. 1871. Ñber das Männchen von Cobitis taenia Lin. Z. wiss. Zool. 21: 538–539.
Carmona, J.A., O.I. Sanjur, I. Doadrio, A. Machordom & R.C. Vrijenhoek. 1997. Hybridogenetic reproduction and maternal ancestry of polyploid Iberian fish: the Tropidophoxinellus alburnoides complex. Genetics 146: 983–993.
Clutton-Brock, T.H. & A.C.J. Vincent. 1991. Sexual selection and the potential reproductive rates of males and females. Nature 351: 58–59.
Conover, D.O. & M.H. Kynard. 1981. Environmental sex determination: interaction of temperature and genotype in a fish. Nature 326: 496–498.
Dawley, R.M. 1989. An introduction to unisexual vertebrates. pp. 1–18. In: R.M. Dawley & J.P. Bogard (ed.) Evolution and Ecology of Unisexual Vertebrates, Bulletin 466, New York State Museum, Albany.
Driescher, E., H. Behrendt, G. Schellenberger & R. Stellmacher. 1993. Lake Müggelsee and its environment, natural conditions and anthropogenic impacts. Int. Rev. ges. Hydrobiol. 78: 327–343.
Emlen, S.T. & L.W. Oring. 1977. Ecology, sexual selection and evolution of mating systems. Science 197: 215–223.
Flajšhans, M. 1997. A model approach to distinguish diploid and triploid fish by means of computer-assisted image analysis. Acta vet. Brno 66: 101–110.
Gambetta, L. 1934. Sulla variabilita del cobite fluviale (Cobitis taenia L.) e sul rapporto numerico dei sessi (On the variability of spined loach (Cobitis taenia L.) and on its sex-ratio). Boll. Musei Zool. Anat. comp. 44: 297–325.
Kim, I.S. & M.T. Jeong. 1988. Seasonal variation of the color pattern in the cobitid fish Cobitis taenia lutheri from Korea. Korean J. Ecol. 11: 77–82.
Kim, I.S. & J.H. Lee. 1990. Diploid-triploid hybrid complex of the spined loach Cobitis sinensis and C. longicorpus (Pisces, Cobitidae). Korean J. Ichthyol. 2: 203–210.
Kim, I.S. & J.Y. Park. 1992. Sex ratios and hermaphroditism of Cobitis lutheri (Pisces, Cobitidae) from Korea. Korean J. Ichthyol. 4: 72–76.
Kim, I.S & Y.M. Son. 1984. Cobitis choii, a new cobitid fish from Korea. Korean J. Zool. 27: 49–55.
Kirkendall, L.R. & N.C. Stenseth. 1990. Ecological and evolutionary stability of sperm-dependent parthenogenesis: effects of partial niche overlap between sexual and asexual females. Evolution 44: 698–714.
Lobon-Cervia, J. & A. Zabala. 1984. Observations on the reproduction of Cobitis paludicola DeBuen, 1930 in the Jarama River. Cybium 8: 63–68.
Lodi, E. 1967. Sex reversal of Cobitis taenia L. (Osteichthyes, fam. Cobitidae). Experientia 23: 446–447.
Lodi, E. 1980. Hermaphroditic and gonochoric populations of Cobitis taenia bilineata Canestrini (Cobitidae, Ostheichthyes). Mon. Zool. Italiana 14: 235–243.
Lutnesky, M.M.F. 1994. Density-dependent protogynous sex change in territorial-haremic fishes: models and evidence. Behav. Ecol. 5: 375–383.
Lye, C.M., C.L.J. Frid, M.E. Gill & D. McCormick. 1997. Abnormalities in the reproductive health of flounder Platichthys flesus exposed to effluent from a sewage treatment works. Mar. Pollut. Biol. 34: 34–41.
Marconato, A. & M.B. Rasotto. 1989. The biology of a population of spined loach, Cobitis taenia L. Boll. Zool. 56: 73–80.
Mišík, V. 1958. --K výskytu a biometrike plža horského balkanského (Cobitis aurata (Filippi 1865) balcanica Karaman 1922 natio montana (?) Vladykov 1925) z riekyKysuce (Occurrence and biometry of the loach (Cobitis aurata (Filippi 1865) balcanica Karaman 1922 natio montana (?) Vladykov 1925) in Kysuca River). Biologia (Bratislava) 13: 810–832.
Monaco, J.P., E.M. Rasch & J.S. Balsano. 1981. Sperm availability in naturally occurring bisexual-unisexual breeding complexes involving Poecilia mexicana and the gynogenetic teleost, Poecilia formosa. Env. Biol. Fish. 6: 159–166.
Osinov, A.G., E.D. Vasil'eva & V. Vasil'ev. 1990. The problem of reticulate speciation in vertebrates: diploid-triploid-tetraploid complex in the genus Cobitis (Cobitidae). II. Characteristics of the triploid form J. Ichthyol. 30: 59–67.
Peris, S.J., A. Martin & J.C. Velasco. 1994. Age, growth and reproduction of the cyprinid Tropidophoxinellus alburnoides (Stephanidis, 1974) in River Agueda, West-Central Spain. Arch. Hydrobiol. 131: 341–352.
Purdom, C.E. 1993. Genetics and fish breeding. Chapman & Hall, London. 277 pp.
Ráb, P. & O. Slavík. 1996. Diploid-triploid-tetraploid complex of the spined loach, genus Cobitis, in Psovka Creek: first evidence of the new species of Cobitis in the ichtyofauna of the Czech Republic. Acta Univ. Carolinae Biologica 39: 201–214.
Rasotto, M.B., A. Marconato, M. Comuzzi & P. Caedellini. 1990. Osservazione sulla biologia del cobite mascherato, Sabanejewia larvata de Filippi (Pisces, Cobitidae) (Observations on the biology of the masked loach, Sabanejewia larvata de Filippi (Pisces, Cobitidae)). Riv. Idrobiol. 29: 445–460.
Robotham, P.W.J. 1981. Age, growth and reproduction of a population of spined loach, Cobitis taenia (L.). Hydrobiologia 85: 129–136.
Saitoh, K. 1990. Reproductive and habitat isolation between two populations of the striated spined loach. Env. Biol. Fish. 28: 237–248.
Schultz, R.J. 1971. Special adaptive problems associated ith unisexual fishes. Amer. Zool. 11: 351–360.
Schultz, H. 1996. Drastic decline of the proportion of males in the roach (Rutilus rutilus L.) population of Bautzen Reservoir (Saxony, Germany): result of direct and indirect effects of biomanipulation. Limnologica 26: 153–164.
Sezaki, K. & H. Kobayasi. 1978. Comparison of erythrocyte size and polyploidy in spinous loach, Cobitis biwae. Bull. Japan. Soc. Sci. Fish. 44: 851–854.
Sezaki, K., H. Kobayasi, S. Watabe & K. Hashimoto. 1985. Erythrocyte size and polyploidy of cobitid fishes in Japan. Bull. Japan. Soc. Sci. Fish. 51: 777–781.
Slavík, O. & P. Ráb. 1996. Life history of spined loach, Cobitis taenia, in an isolated site (Pšovka Creek, Bohemia). Folia Zool. 45: 247–252.
Suzuki, R. 1966. Artificial spawning and early development of the loach, Cobitis delicata Niwa. Bull. Freshw. Fish. Res. Lab. 15: 175–188.
Vasil'eva, E.D. & V.G. Poznyak. 1985. Morphological characteristics of the Caucasian spiny loach, Sabanejewia caucasica (Cobitidae). J. Ichthyol. 25: 148–156.
Vasil'eva, E.D. & V.P. Vasil'ev. 1988. A study of the intraspecific structure of Sabanejewia aurata (Cobitidae) with a description of a new subspecies, S. aurata kubanica subsp. nov. J. Ichthyol. 28: 148–156.
Vasil'eva, E.D. & V.P. Vasil'ev. 1998. Sibling species in genus Cobitis (Cobitidae). Cobitis rossomeridionalis sp. nova. J. Ichthyol. 38: 580–590.
Vasil'ev, V.P., K.D. Vasil'eva & A.G. Osinov. 1989. Evolution of a diploid-triploid-tetraploid complex in fishes of the genus Cobitis. pp. 153–169. In: R.M. Dawley & J.P. Bogard (ed.) Evolution and Ecology of Unisexual Vertebrates, Bulletin 466, New York State Museum, Albany.
Vladykov, V.D. 1928. Ñber sekundären Geschlechtsdimorphismus bei unseren Cobitiden. Zool. Jahrbücher, Abteil. Systematik 55: 147–162.
Vrijenhoek, R.C. 1989. Genetic and ecological constraints on the origins and establishment of unisexual vertebrates. pp. 24–31. In: R.M. Dawley & J.P. Bogart (ed.) Evolution and Ecology of Unisexual Vertebrates, Bulletin 466, New York State Museum, Albany.
Witkowski, A., J. Blachuta & J. Kusznierz. 1990. Golden loach, Sabanejewia aurata (deFilippi, 1865) in the Widawa River-the second locality in the Odra River basin. Przegl. zool. 34: 319–323.
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Bohlen, J., Ritterbusch, D. Which Factors Affect Sex Ratio of Spined Loach (genus Cobitis) in Lake Müggelsee?. Environmental Biology of Fishes 59, 347–352 (2000). https://doi.org/10.1023/A:1007695703991
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DOI: https://doi.org/10.1023/A:1007695703991