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Temporal pattern of sperm release from the colonial ascidian,Botryllus schlosseri

✍ Scribed by Stewart-Savage, J.; Yund, Philip O.

Book ID: 101227856
Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 135 KB
Volume: 279
Category: Article
ISSN: 0022-104X
DOI: 10.1002/(sici)1097-010x(19971215)279:6<620::aid-jez10>3.0.co;2-5

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✦ Synopsis

In free-spawning marine organisms, gametes are rapidly diluted in the water column. Although the colonial ascidian Botryllus schlosseri has been employed in field fertilization studies, the spatial and temporal patterns of sperm release are unknown. To determine the temporal pattern of sperm release in laboratory-cultured B. schlosseri, we cultured colonies at different stages of the reproductive cycle in small volumes (5-15 ml) of seawater. At 8 h intervals, animals were transferred to fresh seawater, and the number of sperm released during the previous period was determined. The data, from 18 colonies, demonstrate that 1) sperm release starts soon after the opening of the inhalant siphons, 2) sperm are released throughout most of the sexual cycle, and 3) the number of sperm released from an individual colony fluctuates with time.

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