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Biol Bull 142: 520-529. (June 1972)
© 1972 Marine Biological Laboratory
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THE EFFECT OF DELAYED FERTILIZATION IN SOME SPECIES OF THE GENUS TISBE (COPEPODA, HARPACTICOIDA)

BRIGITTE VOLKMANN-ROCCO 1

1 Istituto di Biologia del Marc, CNR, Venice, Italy

Delay in fertilization of the females of Tisbe dobzhanskii from Anzio.T. holothuriac from Ponza, and T. clodiensis from Venice and Ponza was found to affect the sex-ratio of these populations.

The degree of the influence depended largely upon the lateness of fertilization and, thus, upon the biology of the species.

Especially in T. dobzhanskii shifting of the sex-ratio in favor of males was highly significant. In the other populations it was less evident, but still significant. If the delay of fertilization was too great, the females were no longer able to produce viable offspring.

In addition to the shifting of the sex-ratio towards males an increase of offspring per family was observed.

The possible adaptive nature of the phenomenon is discussed.






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Copyright © 1972 by the Marine Biological Laboratory.