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Sex determination in Ophryotrocha labronica (Polychaeta, Dorvilleida)
Åkesson, B. (1972). Sex determination in Ophryotrocha labronica (Polychaeta, Dorvilleida), in: Battaglia, B. (Ed.) Fifth European Marine Biology Symposium. pp. 163-172
In: Battaglia, B. (Ed.) (1972). Fifth European Marine Biology Symposium. European Marine Biology Symposia, 5. Piccin Editore: Padova. 348 pp., meer
In: European Marine Biology Symposia., meer
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Documenttype: Congresbijdrage
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  • Åkesson, B.
Abstract
    Sex conditions have been studied in 3 strains of Ophryotrocha labronica. They are gonochoristic with different, but constant sex ratios. Males can be discerned from the 6-setiger-stage, females from the 8-setiger-stage. By selection through 5 generations the male ratio was increased 20%. No decrease was obtained. In subsequent crosses the progeny expressed the sex ratio of the mother's strain. Between 2 strains with different sex ratio both reciprocal crosses approached an 1:1 ratio. Environmental factors do not seem to affect the sex ratio. Previous statements about sex conditions are discussed.
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