Abstract
Biological aspects of the brazilian retifer Asplanchna sp., reared in the laboratory, were studied and the mean curve of development and its connections with the generation time of amictic females were established. The mean generation time was around 22 hr; thus, the fust offspring of an amictic female were born, on the average, almost at the end of its active growth period.
Studies on the longevity of amictic females and on the fecundity in amictic and mictic females were also carried out. The amictic females showed a mean longevity of 90.30 hr and a mean fecundity of 17 female offspring. On the other hand, an unfertilized female produced an average of 13 male offspring or, if fertilized, 4 resting-eggs.
References
Birky, C. W., Jr. 1964. Studies on the physiology and genetics of the rotifer, Asplanchna. I. Methods and physiology. J. Exp. Zool., 155: 273-292.
Birky, C. W.; Jr. 1965. Studies on the physiology and genetics of the rotifer, Asplanchna. II. The genic basis of a case of male sterility. J. Exp. Zool., 158: 349-356.
Birky, C. W., Jr. 1967. Studies on the physiology and genetics of the rotifer, A splanchna. III. Results of outcr.ossing, selfmg and selection. J. Exp. Zool., 164: 105-116.
Birky, C. W., Jr. 1968. The developmental genetics of polymorphism in the rotifer. Asplanchna. I. Dietary vitamin E control of mitosis and morphogenesis in embiyos. J. Exp. Zool., 169: 205-210.
Birky, C. W., Jr. 1969. The developmental genetics of polymorphism in the rotifer. Asplanchna. III. Quantitative modification of developmental responses to vitamin E, by the genome, physiological state, and population density of responding females. J. Exp. Zool., 170: 437-448.
Birky, C. W., Jr., & J. J. Gilbert 1971. Parthenogenesis in rotifers: the control of sexual and asexual reproduction. Amer. Zool., 11: 245-266.
Birky, C. W., Jr., & J. J. Gilbert 1972. Vitamin E as an extrinsic and intrinsic signal controlling development in the rotifer Asplanchna: uptake, transmission and localization of eH) alpha-tocopherol. J. Embriol. Exp. Morph., 27: 103- 120.
Buchner, H., H. Kiechle, & P. Harnm 1965. Zur fortpflanzungsbiologie der riidertiere. Naturwissenschaften, 52: 352.
Buchner, H., C. Mutschler, & H. Kiechle 1967. Die determinatio'n der miinnchen and dauereiproduktion bei Asplanchna sieboldi. Biol. Zbl., 86: 599-621.
Gi1bert, J. J. 1968. Dietary control of sexuality in the rotifer Asplanchna brightwelli Gosse. Physiol. Zool., 41: 14-43.
Gilbert, J. J., & G. A. Thompson 196 8. Alpha-tocopherol control of sexuality and polymorphism in the rotifer Asplanchna. Science, 159: 734-738.
Lewontin, R. C. 1965. Selection for colonizing ability, p. 77-91. In The genetics of colonizing species. New York, Academic Press.
Sonneborn, T. M. 1950. Methods in the general biology and genetics of Paramecium aurelia. J. Exp. Zool. , 113: 87-147.
Comments
This work is licensed under a Creative Commons Attribution 4.0 International License.
Copyright (c) 1978 Revista de Biología Tropical