Abstract
The reproductive cycle of Bispira volutacornis, a dioecious polychaete, was followed over two spawning periods in Lettercallow Bay, on the west coast of Ireland. In the younger generation of sexually mature adults, gender can be determined on the basis of colour, the dorsal aspect of the males being cream at maturation, whilst the females are pink at the previtellogenic stage and an olive green at maturation. An annual reproductive cycle of 12 months shows that oocyte/sperm maturation is extraovarian. The male reproductive cycle proceeded at a more rapid pace than that of the female cycle, with sperm maturing earlier. Spawning in B. volutacornis occurred between late July and early September. B. volutacornis is a polytelic species, surviving spawning and releasing all gametes in a single batch, with a mean spawned oocyte diameter of 118 μm. The reproductive cycle appears to be regulated by a seasonal change in water temperature, and spawning is timed to produce larvae during the autumnal planktonic bloom in Lettercallow Bay.
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Acknowledgements
The authors wish to thank the technical staff of the Benthos Research Group, Mr. A. Lawless and Mr. J. Galvin, in the Department of Zoology, N.U.I. Galway, for their assistance.
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Communicated by J.P. Thorpe, Port Erin
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Nash, R., Keegan, B.F. Reproductive cycle of Bispira volutacornis (Polychaeta: Sabellidae) on the west coast of Ireland. Marine Biology 143, 919–925 (2003). https://doi.org/10.1007/s00227-003-1146-0
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DOI: https://doi.org/10.1007/s00227-003-1146-0