Fertilization success in Galeolaria caespitosa (Polychaeta serpulidae): gamete characteristics, role of sperm dilution, gamete age, and contact time

Elena K. Kupriyanova*

*Corresponding author for this work

Research output: Contribution to journalConference paperpeer-review

11 Citations (Scopus)

Abstract

Variability in gamete traits and the factors affecting fertilization success were studied in a common gregarious broadcast-spawning serpulid polychaete Galeolaria caespitosa. Variability of egg size and sperm velocity were not related to the adult size. High sperm concentrations (107-108 sperm. ml-1) were required to achieve fertilization rates of 60-80%. The gamete contact time required to achieve high fertilization rates (70-80%) in G. caespitosa did not exceed 5 minutes of gamete exposure given sufficiently high sperm concentrations. This suggests that attachment of sperm to the egg takes place very rapidly, and a short-term exposure to highly concentrated sperm is a common feature of fertilization ecology of this gregarious species. A sharp decline in fertilization rates at high sperm concentrations usually attributable to polyspermy was not observed. Sperm were motile for up to 6 hours after activation; however, swimming velocity and fertilization success decreased after 2 hours. Eggs of G. caespitosa were fertilizable up to 10 hours after spawning, but the number of embryos resulting from fertilizations by fresh sperm decreased after 2 hours. The gamete traits of G. caespitosa appear to have evolved to enable this sessile organism to reproduce under conditions of high population density and increased risk of polyspermy.

Original languageEnglish
Pages (from-to)309-317
Number of pages9
JournalScientia Marina
Volume70
Issue numberSUPPL. 3
Publication statusPublished - 2006
Event8th International Polychaete Conference - Madrid, Spain
Duration: 1 Jul 2004 → …

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