Absence of a lansing effect in drosophila subobscura

ABSTRACT LANSING1 has conducted experiments to show the effect of maternal age on the length of life of the parthenogenetic rotifer _Philodina citrina_. The median length of life of the

‘wild’ strain of this species was 21–24 days, and maximum length and the adult rate of egg production were reached on the sixth day of life. A strain was bred from this wild strain

consisting of rotifers hatched in each generation from eggs laid on the fourth day of parental life. Other strains were established, with parental ages in each generation of eleven and of

sixteen days. In the fourth-day strain, the mean expectation of life increased over several generations, and the age of attaining the adult rate of egg production was delayed. In the

eleventh- and sixteenth-day strains, there was a rapid decrease in the mean expectation of life, the strains reaching extinction in five and three generations respectively. According to

Lansing, longevity progressively declines in any strain which is maintained in each generation from eggs laid on or after the sixth day of life. Results similar to those given by _Philodina_

were also obtained by Lansing with _Euchlanis triquetra_. Access through your institution Buy or subscribe This is a preview of subscription content, access via your institution ACCESS

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REFERENCES * Lansing, A., _J. Gerontol._, 2, 228 (1947); _Proc. U.S. Nat. Acad. Sci._, 34, 304 (1948). Article  CAS  PubMed  Google Scholar  * Hyman, L. H., “_The Invertebrates_”, 3, 99

(McGraw-Hill, New York, 1951). Google Scholar  * Alpatov, W. W., and Pearl, R., _Amer. Nat._, 63, 37 (1929). Article  Google Scholar  * Stolfi, J. E. (1938), in Miller, A., “Biology of

Drosophila”, 530 (Chapman and Hall, London, 1950). Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Department of Zoology, University College, London, W.C.1

ALEX COMFORT Authors * ALEX COMFORT View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE

CITE THIS ARTICLE COMFORT, A. Absence of a Lansing Effect in _Drosophila subobscura_. _Nature_ 172, 83–84 (1953). https://doi.org/10.1038/172083a0 Download citation * Issue Date: 11 July

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