Abstract
The reproductive development of three species of the Petrosida, Xestospongia bergquistia, X. exigua, and X. testudinaria, was monitored for four years on a fringing reef at Orpheus Island, Great Barrier Reef, Australia. All three species were oviparous and female reproductive activity began prior to males becoming active. X. bergquistia and X. testudinaria were gonochoric and broadcast eggs in spawning events that were synchronous within species. Egg development occurred over more than five months in X. bergquistia and X. testudinaria and two months in X. exigua. Spawning was during periods of warm temperature and occurred in October or November for X. bergquistia and X. testudinaria, and January or February for X. exigua. Lunar phase was implicated in timing of spawning of X. testudinaria. Diel timing of spawning in X. testudinaria and X. bergquistia was consistently a morning event.
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Fromont, J., Bergquist, P.R. Reproductive biology of three sponge species of the genus Xestospongia (Porifera: Demospongiae: Petrosida) from the Great Barrier Reef. Coral Reefs 13, 119–126 (1994). https://doi.org/10.1007/BF00300772
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DOI: https://doi.org/10.1007/BF00300772