Abstract
Among egg trading hermaphrodites, any factor which limits the number of eggs released by a female role hermaphrodite can potentially limit the mating success of the male role hermaphrodite fertilizing those eggs. This work examines the hypothesis that the timing of ovulation constrains the size of egg parcels and thereby limits male mating success in the egg parceling hermaphroditic fish Serranus subligarius. Two alternatives were evaluated: (1) Ovulation is a discrete event preceding spawning. It does not constrain the size of egg parcels and therefore does not limit mating success of male role partners. (2) Ovulation is an incremental process occurring throughout the spawning period. It limits the number of eggs available for release in each parcel and thereby limits mating success of the male role partner. Assessment of ovulation was conducted in a field stock of S. subligarius. Fish from size matched pairs were manually stripped at the onset of the spawning period or quarantined and sampled at the end of the spawning period. Fish sampled at either time point had the same number of eggs, suggesting that ovulation was a discrete event occurring at the onset of the spawning period. The diurnal cycle of ovulation was observed in naturally spawning hermaphrodites captured at intervals throughout the day. Ovulation began 2–4 h before spawning began. Some fish appeared to ovulate the entire day's clutch of eggs before spawning, while other fish released egg parcels before completing ovulation. I conclude that the pattern of ovulation is not uniform throughout the spawning stock. Because of the variability in timing of ovulation relative to parcel release, ovulation does not consistently limit the size of egg parcels and therefore is unlikely to be a physiological limit to male role mating success in S. subligarius hermaphrodites.
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References cited
Bateman, A.J. 1948. Intrasexual selection in Drosophila. Heredity 2: 9–368.
Brunet, J. 1992. Sex allocation in higher plants. Trends Ecol. Evol. 7: 79–84.
Charnov, E.L., 1979. Simultanous hermaphroditism and sexual selection. Proc. Nat. Acad. Sci. USA 76: 2480–2484.
de Vlaming, V. 1983. Oocyte development patterns and hormonal involvements among teleosts. pp. 176–199. In: J.C. Rankin, T.J. Pitcher & R.T. Duggan (ed.) Control Processes in Fish Physiology, John Wiley & Sons, New York.
Fischer, E.A. 1980. The relationship between mating system and simultaneous hermaphroditism in the coral reef fish, Hypoplectrus nigricans (Serranidae). Anim. Behav. 28: 620–633.
Fischer, F.A. 1984. Egg trading in chalk bass, Serranus tortugarum a simultaneous hermaphrodite. Z. Tierpsychol. 66: 143–151.
Fischer, E.A. 1986. Mating systems of simultaneously hermaphroditic scrranid fishes. pp. 776–784. In: T. Uyeno, R. Arai, T. Taninchi & K. Matsunnra (ed.) Indo-Pacific Fish Biology: Proceedings of the Second International Conference on Indo-Pacific Fishes, Ichthyological Society of Japan, Tokyo.
Fischer, E.A. & P.D. Hardison. 1987. The timing of spawning and egg production as constraints on male mating success in a simultaneously hermaphroditic fish. Env. Biol. Fish. 20: 301–310.
Fischen, E.A. & C.W. Petersen. 1987. The evolution of sexual patterns in the scabasses. Bioscience 37: 482–489.
Hastings, P.A. & S.A. Bortone. 1980. Observations on the life history of the belted sandfish, Serranus subligarius (Serranicae). Env. Biol. Fish. 5: 365–374.
Havelange, S. & J. Voss. 1993. Le comportement reproducteur d'un poisson hermaphrodite synchrone: Serranus scriba (Linne, 1758). Revue fr. Aquariol. 20: 1–4.
Lejeune, P., J.-M. Boveroux & J. Voss. 1980. Observation du comportement reproducteur de Serranus scriba Linne (Pisces, Serranidae), possion hermaphrodite synchrone. Cybium 10: 73–80.
Oliver, A.S. 1994. Hermaphroditism in belted sandfish Serranus subligarius (Perciformes: Serranidae): social interactions, size, and sex steroids define a mating system. Ph.D. Dissertation, Duke University, Durham. 205 pp.
Oliver, A.S. 1997. Size and density dependent mating tactics in the simultaneously hermaphroditic seabass Serranus subligarius. Behaviour 134: 563–594.
Petersen, C.W. 1990a. Variation in reproductive success and gonadal allocation in the simultaneous hermaphrocite, Serranus fasciatus. Occologia 83: 62–67.
Petersen, C.W. 1990b. The relationships among population density, individual size, mating tacties, and reproductive success in a hermaphroditic fish, Serranus fasciatus. Behaviour 113: 57–80.
Petersen, C.W. 1995. Reproductive behavior, egg trading, and correlates of male mating success in the simultaneous hermaphrodite, Serranus tabacarius. Env. Biol. Fish. 43: 351–361.
Pressley, P.H. 1981. Pair formation and joint territoriality in a stmultaneous hermaphrodite: the coral reef fish Serranus tigrinus. Z. Ticrpsychol. 56: 33–46.
Robins, C.R. & W.A. Starck, II. 1961. Materials for a revision of Serranus and related fish genera. Proc. Acad. Nat. Sci. Phila. 113: 259–314.
Wallace, R.A. & K. Selman. 1981. Cellular and dynamic aspects of oocyte growth in teleosts. Amer. Zool. 21: 325–343.
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Cheek, A.O. Ovulation does not constrain egg parcel size in the simultaneous hermaphrodite Serranus subligarius. Environmental Biology of Fishes 52, 435–442 (1998). https://doi.org/10.1023/A:1007467611969
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DOI: https://doi.org/10.1023/A:1007467611969