Abstract
For most sessile marine invertebrates the number of offspring produced by an individual is often determined indirectly from counts of eggs present, with the assumption that all or most become viable offspring. Few field data on the actual number of offspring produced per individual (reproductive success) have been reported. We examined reproductive success in the octocoral, Briareum asbestinum (Pallas), by measuring embryo densities on 40 female colonies on two reefs (Pinnacles and House reefs) in the San Blas Islands, Panama from 1986 to 1988. The percentage of female colonies with mature eggs which subsequently released embryos was low, ranging from 46.6% in 1986 to 5.0% in 1988. Reproductive success was significantly different between reefs. Pinnacles reef had significantly more successful colonies (those releasing embryos) than House reef in all three years and significantly higher embryo densities in 1986 and 1987. There was a significant positive correlation between female reproductive success and the density and proximity of nearby males in both 1986 and 1987. In addition, fertile female branches placed 25 cm away from male branches produced significantly more embryos than female branches placed 50 cm away. In 1988 two groups of female branches were placed at distances of <50 cm and 5 m from four large male colonies at Pinnacles reef. Of the 20 female branches placed 5 m from the males none released embryos while 35% (7 of 20 branches) of the branches <50cm from males released embryos. These data indicate that simple counts of mature eggs present within female colonics prior to the reproductive season provide a poor estimate of reproductive success in B. ashestinum and that female reproductive success is positively influenced by the close proximity of males.
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Benayahu, Y., Loya, Y. (1984). Life history studies on the Red Sea soft coral Xenia macrospiculata Gohar, 1940. I. Annual dynamics of gonadal development. Biol. Bull. mar. biol. Lab., Woods Hole 166:32–43
Brazeau, D. A. (1989). A male-biased sex ratio in the Caribbean octocoral, Briareum asbestinum (Pallas). Ph. D. thesis, SUNY at Buffalo, Buffalo, New York
Brazeau, D. A., Lasker, H. R. (1990). Sexual reproduction and external brooding by the Caribbean gorgonian Briareum asbestinum (Pallas). Mar Biol. 104:465–474
Campbell, R. D. (1974). Cnidaria. In: Giese, A. C., Pearse, J. S. (eds.) Reproduction of marine invertebrates. Academic Press, New York, p. 133–199
Chia, F. S. (1976). Sea anemone reproduction: patterns and adaptive radiations. In: Mackie, G. O. (ed.) Coelenterate ecology and biology. Plenum Press, New York, p. 261–270
Coffroth, M. A. (1988). Mucous sheet production by poritid corals. Ph. D. thesis, Rosenstiel School of Marine and Atmospheric Science, Univ. of Miami, Miami, Florida
Denny, M. W. (1988). Biology and the mechanics of the wave-swept environment. Princeton Univ. Press, Princeton
Denny, M. W., Shibata, M. F. (1989). Consequences of surf-zone turbulence for settlement and external fertilization. Am. Nat. 134:859–889
Fadlallah, Y. H., Pearse, J. S. (1982). Sexual reproduction in solitary corals: overlapping oogenic and brooding cycle, and benthic planulae in Balanophyllia elegans. Mar. Biol. 71:223–231
Farrant, P. A. (1985). Gonad development and the planulae of the temperate Australian soft coral Capnella gaboensis. Mar. Biol. 92:381–392
Giese, A. C., Kanatani, H. (1987). Maturation and spawning. In: Giese, A. C., Pearse, J. S., Pearse, V. B. (eds.) Reproduction of marine invertebrates. Academic Press, New York, p. 251–329
Gray, J. (1928). The effect of sperm dilution on the activity of spermatozoa. J. exp. Biol. 5:337–344
Heyward, A. J., Babcock, R. C. (1986). Self- and cross-fertilization in scleractinian corals. Mar. Biol. 90:191–195
Hull, C. H., Nie, N. H. (1981). SPSS Update 7-9. New procedures and facilities for release 7–9. McGraw-Hill Book Co., New York
Levitan, D. R., Sewell, M. A., Chia, F. S. (1991). Kinetics of fertilization in the sea urchin Strongylocentrotus franciscanus: interaction of gamete dilution, age and contact time. Biol. Bull. mar. biol. Lab., Woods Hole 181:261–268
Levitan, D. R., Sewell, M. A., Chia, F. S. (1992). How distributions and abundance influence fertilization success in the sea urchin Stronglocentrotus franciscamus. Ecology 73:248–254
Miller, R. L. (1970). Sperm migration prior to fertilization in the hydroid Gonothyrea loveni. J. exp. Zool. 175:493–504
Miller, R. L. (1979). Sperm chemotaxis in the hydromedusae. I. Species-specificity and sperm behavior. Mar. Biol. 53:99–114
Miller, R. L. (1989). Evidence for the presence of sexual pheromones in free-spawning starfish. J. exp. mar. Biol. Ecol. 130:205–221
Norusis, M. J. (1985). SPSS-X: an advanced statistics guide. McGraw-Hill, Chicago
Pennington, J. T. (1985). The ecology of fertilization of echinoid eggs: the consequences of sperm dilution, adult aggregation, and synchronous spawning. Biol. Bull. mar. biol. Lab., Woods Hole 169:417–430
Real, L. (1983). Pollination biology. Academic Press, New York
Sprung, M., Bayne, B. L. (1984). Some practical aspects of fertilizing the eggs of the mussel Mytilus edulis L. J. Cons. int. Explor. Mer. 41:125–128
Strathmann, R. R. (1985). Feeding and non-feeding development and life-history evolution in marine invertebrates. A. Rev. Ecol. Syst. 16:339–361
Szmant-Froelich, A. M., Yevich, P., Pilson, M. (1980). Gametogenesis and early development of the temperate coral Astrangia danae. Biol. Bull. mar. biol. Lab., Woods Hole 158:257–269
Thorson, G. (1946). Reproduction and larval development of Danish marine bottom invertebrates. Meddr Kommn Havunders. (Ser. Plankton) 4:1–523
Thorson, G. (1950). Reproductive and larval ecology of marine bottom invertebrates. Biol. Rev. Cambridge Phil. Soc. 25:1–45
Tomascik, T., Sander, F. (1987). Effects of eutrophication on reef-building corals, III. Reproduction of the reef-building coral Porites porites. Mar. Biol. 94:77–94
Tranter, P. R. G., Nicholson, D. N. (1982). A description of spawning and post-gastrula development of the cool temperate coral, Caryophyilla smithi. J. mar. biol. Ass. U. K. 62:845–854
Wourms, J. P. (1987). Oogenesis. In: Giese, A. C., Pearse, J. S., Pearse, V. B. (eds.) Reproduction of marine invertebrates. Academic Press, New York, p. 49–178
Vance, R. R. (1973a). On reproductive strategies in marine benthic invertebrates. Am. Nat. 107:339–352
Vance, R. R. (1973b). More on reproductive strategies in marine benthic invertebrates. Am. Nat. 107:353–361
Van Moorsel, G. W. N. M. (1983). Reproductive strategies in two closely related stony corals (Agaricia, Scleractinia). Mar. Ecol. Prog. Ser. 13:273–283
Yund, P. O. (1990). An in situ measurement of sperm dispersal in a colonial marine hydroid. J. exp. mar. Biol. 253:102–106
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Communicated by J. Grassle, New Brunswick
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Brazeau, D.A., Lasker, H.R. Reproductive success in the Caribbean octocoral Briareum asbestinum . Marine Biology 114, 157–163 (1992). https://doi.org/10.1007/BF00350865
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DOI: https://doi.org/10.1007/BF00350865