[en] The gonad and maturity index cycles of the echinoid Paracentrotus lividus and their relations with environmental abiotic parameters are assessed after 2 years of observation in southern Brittany, France. The gonadal cycle is briefly described and eight gonadal stages are characterized. The annual cycle, the time of spawning and the period of gonadal growth are well established, suggesting they are controlled externally. The reproductive cycle has three main phases: the growing phase (late autumn and winter) when gonads accumulate reserve material; the maturation phase (spring and early summer) in which gametogenesis then spawning take place; and the spent/regenerating phase when relict gametes are resorbed by the nutritive phagocytes, the gonads being virtually devoid of sexual cells. The maturity index based on the histological diagnosis of gonads and the use of circular data and polar graphical representation make it possible to reliably determine the spawning period, the rate of gametogenesis and the synchronization of males and females among the echinoid population. From this analysis, we can reasonably say that the gonadal cycle (represented by the gonad index), the rate of gametogenesis, and the end of the spawning period are influenced by temperature whereas the first spawning event appears to be triggered by day length.
Batschelet, E., 1981. Circular Statistics in Biology Academic Press, London
Bay-Schmith, E., and Pearse, J. S., 1987. Effect of fixed daylengths on the photoperiod regulation of gametogenesis in the sea urchin Strongylocentrotus purpuratus. Invert. Reprod. Develop., 11:287–294.
Byrne, M., 1990. Annual reproductive cycles of the commercial sea urchin Paracentrotus lividus from an exposed intertidal and a sheltered subtidal habitat on the west coast of Ireland. Mar. Biol., 104:215–289.
Cochran, R. C., and Engelman, F., 1975. Environmental regulation of the annual reproductive season of Strongylocentrotus purpuratus (Stimpson). Biol. Bull., 148:393–401.
Crapp, G. B., and Willis, M. E., 1975. Age determination in the sea urchin Paracentrotus lividus (Lmck), with notes on the reproduction cycle. J. Exp. Mar Biol. Ecol., 20:157–178.
De Ridder, C., and Lawrence, J. M., 1982. “ Food and feeding mechanisms:Echinoidea ”. In Echinoiderm Nutrition Edited by:Jangoux, M., and Lawrence, J. M., 117–159. Rotterdam:Balkema.
Ebert, T. A., 1968. Growth rates of the sea urchin Strongylocentrotus purpuratus related to food availibility and spin abrasion. Ecology, 49:1075–1091.
Eckelbarger, K. J., and Watling, L., 1995. Role of phylogenetic constraints in determining reproductive patterns in deep-sea invertebrates. Invert. Biol., 114 (3):256–269.
Fameree, D., 1973. Contribution à l'étude du cycle annuel de reproduction de deux espèces d'échinoïdes (Echinodermata) des côtes de Bretagne Mémoire, Université Libre de Bruxelles
Fenaux, L., 1968. Maturation des gonades et cycle saisonnier des larves chez A. lirula, P. lividus et P. microtuberculatus (Echinides) à. Villefranche-sur-Mer. Vie Milieu, 19:1–52.
Femandez, C., 1990. Recherches préliminaires à la mise en place d'un pilote d'aquaculture de l'oursin Paracentrotus lividus dans un étang Corse Mémoire DES en Océanologie, Université Aix Marseille II.
Fernandez, C., 1996. Croissance et nutrition de Paracentrotus lividus dans le cadre d'un projet aquacole avec alimentation artificielle Université de Corse. Thèse de doctorat
Fuji, A., 1960. Studies on the biology of the sea urchin. III. Reproductive cycles of two sea urchins, Strongylocentrotus nudus Strongylocentrotus intermedius. Bull. Fac. Fish. Hokkaido Univ., 11:49–57.
Giese, A. C., 1959. Comparative physiology:annual reproductive cycles of marine invertebrates. Ann. Rev. Physiol., 21:547–576.
Giese, A. C., and Pearse, J. S., 1974. “ Introduction:general principles ”. In Reproduction of Marine Invertebrates, Vol.1 Edited by:Giese, A. C., and Pearse, J. S., 149New York:Academic Press.
Gonor, J. J., 1973. Reproductive cycles in Oregon populations of the echinoid, Strongylocentrotus purpuratus (Stimpson). I. Annual gonad growth and ovarian gametogenic cycles. J. Exp. Mar. Biol. Ecol., 12:45–64.
Guettaf, F. M., and San Martin, G. A., 1995. Etude de la variabilité de l'indice gonadique de l'oursin comestible Paracentrotus lividus (Echinodermata:Echinoidea) en Méditerranée Nord-Occidentale. Vie Milieu, 45:129–137.
Himmelman, J. H., 1975. Phytoplankton as a stimulus for spawning in three marine invertebrates. J. Exp. Mar. Biol. Ecol., 20:199–214.
Himmelman, J. H., 1986. Population biology of green sea urchins on rocky barrens. Mar. Ecol. Prog. Ser., 33:295–306.
Keats, D. W., Steele, D. H., and South, G. R., 1983. Food relations and short-term aquaculture potential of the green sea urchin Strongylocentrotus droebachiensis in Newfoundland. Mar. Sci. Res. Lab., 24:1–24.
Kenner, M. C., and Lares, M. T., 1991. Size at first reproduction of the sea urchin Strongylocentrotus purpuratus in a central California kelp forest. Mar. Ecol. Prog. Ser., 76:303–306.
King, C. K., Hoegh-Guldberg, O., and Byrne, M., 1994. Reproductive cycle of Centrostephanus rodgersii (Echinoidea), with recommendations for the establishment of a sea urchin fishery in New South Wales. Mar. Biol., 120:95–106.
Lane, J. M., and Lawrence, J. M., 1979. Gonadal growth and gametogenesis in the sand dollar Mellita quinques-perforata (Leske, 1778. J. Exp. Mar. Biol. Ecol., 38:271–285.
Lawrence, J. M., Lane, J. M., Jangoux, M., and Lawrence, J. M., 1982. “ The utilization of nutrients by postmetamorphic echinoderms ”. 331–371. Rotterdam:Balkema.
Levitan, D. R., 1991. Skeletal changes in the test and jaws of the urchin Diadema antillarum in response to food limitations. Mar. Biol., 111:431–435.
Lozano, J., Galera, J., Lopez, S., Turon, X., Palacin, C., and Morera, G., 1995. Biological cycles and recruitment of Paracentrotus lividus (Echinodermata:Echinoidea) in two contrasting habitats. Mar. Ecol. Prog. Ser., 122:179–191.
Mardia, K. V., 1972. Statistics of Directional Data Academic Press, London
McClintock, J. B., and Watts, S. A., 1990. The effects of photoperiod on gametogenesis in the tropical sea urchin Eucidaris tribuloides (Lamarck) (Echinodermata:Echinoidea). J. Exp. Mar. Biol. Ecol., 139:175–184.
Mortensen, T., 1943. “ Camarodonta II. Echinidae, Strongylon-centridae, Parasaleniidae, Echinometridae.) ”. In A Mmonograph of the Echinoidea Vol. 3, Reitzel, Copenhagen
Pearse, J. S., 1969. Reproductive periodicities of Indo-Pacific invertebrates in the Gulf of Suez. II. The echinoid Echinometra mathaei (De Blainville). Bull. Mar. Sci., 19:580–613.
Pearse, J. S., 1981. “ Synchronization of gametogenesis in the sea urchins Strongylocentrotus purpuratus and S. franciscanus ”. In Advances in Invertebrate Reproduction Edited by:Clark, W. H., Jr. and Adams, T. S., 53–68. Amsterdam:Elsevier North Holland.
Pearse, J. S., and Cameron, R. A., 1991. “ Echinoidea ”. In Reproduction of Marine Invertebrates Edited by:Giese, A. C., Pearse, J. S., and Pearse, V. B., Vol. 6, 513–662. Palo Alto:Blackwell Scientific.
Pearse, J. S., McClary, D. J., Sewell, M. A., Austin, W. C., Perez-Rwah, A., and Byme, M., 1988. Simultaneous spawning of six species of echinoderms in Barkley Sound, British Columbia Invert. Reprod. Develop., 14:279–288.
Pearse, J. S., Pearse, V. B., and Davis, K. K., 1986. Photoperiodic regulation of gametogenesis and growth in the sea urchin Strongylocentrotus purpuratus. J. Exp. Zool., 237:107–118.
Pedrotti, M. L., 1993. Spatial and temporal distribution and recruitment of echinoderm larvae in the Ligurian sea. J. Mar. Biol. Ass. UK, 73:513–530.
Régis, M. B., 1979. Analyses des fluctuations des indices physiologiques chez deux échinoïdes (Paracentrotus lividus (Lmk) et Arbacia lixula L.) du Golfe de Marseille. Théthys, 9 (2):167–181.
Urgorri, V., Reboreda, P., and Troncoso, J. S., 1816. Dispersión demografia y producción gonadal de una población de Paracentrotus lividus (Lamarck, Memoria final de resultados del P.I. FEUGA, University Santiago de Compostela, 1994
Yamamoto, M., Ishine, M., and Toshida, M., 1988. Gonadal maturation independent of photic conditions in laboratory-reared sea urchins, Pseudocentrotus depressus Hemicentrotus pulcherrimus. Zool. Sci., 5:979–988.
Yoshida, M., 1952. Some observations on the maturation of the sea urchin Diadema setosum. Annotnes Zool. Jap., 25 (1):265–271.
Zamora, S., and Stotz, W., 1992. Ciclo reproductive de Loxechinus albus (Molina, 1782 (Echinodermata:Echinoidea) en punta Lagunillas, IV Región, Coquimbo. Chile. Rev. Chil. Hist. Nat., 65:121–133.
Zar, J. H., 1996. Biostatistical Analysis Prentice-Hall International, Englewood Cliffs
