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Marine Biology

, Volume 124, Issue 1, pp 77–83 | Cite as

Reproduction and population dynamics of the fissiparous brittle star Ophiactis savignyi (Echinodermata: Ophiuroidea)

  • S.-M. Chao
  • C.-C. Tsai
Article

Abstract

Reproductive cycle, asexual reproduction, and population dynamics of the fissiparous brittle star, Ophiactis savignyi, which inhabits the exhalant passages of the sponge Haliclona sp. were examined monthly from February 1991 to January 1992 at Wanlitung, southern Taiwan (22°N; 120°E). Mature gametes were found from March to December, but release was mainly in May and June. Sexual recruits were found from May to December, with the highest frequency (14.1% of population) in June. Sexual recruits composed 2.4% of the 1-yr sample. Sex ratio of male to female was 24:1. Fission occurred throughout the year, although the frequency of recently split individuals was lower from January to June (6 to 31%), and higher from July to December (42 to 52%). The occurrence of fission was highest after spawning. Regenerating individuals composed 48.2% of the 1-yr sample. Population density fluctuated greatly during summer due to recruitment by fission and mortality or dispersal due to the stressful environmental conditions. Both sexual and asexual reproduction of O. savignyi were successful at this site.

Keywords

Brittle Population Density Sponge Population Dynamic Reproductive Cycle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Barker MF, Scheibling R, Mladenov PV (1992) Seasonal changes in population structure of the fissiparous asteroids Allostichaster insignis (Farquhar) and Coscinasterias calamaria (Gray). In: Scalera-Liaci L, Canicatti C (eds) Echinoderm Research 1991. Balkema, Rotterdam, pp 191–195Google Scholar
  2. Boffi E (1972) Ecological aspects of ophiuroids from the phytal of S.W. Atlantic Ocean warm waters. Mar Biol 15: 316–328Google Scholar
  3. Caspers H (1984) The brittle star, Ophiactis savignyi (Muller and Troschel), an inhabitant of a Pacific sponge Damiriana hawaiiana de Laubenfels. In: Keegan BF, O'Connor BDS (eds) Echinodermata. Balkema, Rotterdam, pp 603–608Google Scholar
  4. Chao S-M, Chen C-P, Alexander PS (1993) Fission and its effect on population structure of Holothuria atra (Echinodermata: Holothuroidea) in Taiwan. Mar Biol 116: 109–115Google Scholar
  5. Chao S-M, Chen C-P, Alexander PS (1994) Reproduction and growth of Holothuria atra (Echinodermata: Holothuroidea) at two contrasting sites in southern Taiwan. Mar Biol 119: 565–570Google Scholar
  6. Chao S-M, Chen C-P, Alexander PS (1995) Reproductive cycles of tropical sea cucumbers (Echinodermata: Holothuroidea) in southern Taiwan. Mar Biol 122: 289–295Google Scholar
  7. Clark AM (1967) Variable symmetry in fissiparous Asterozoa. Symp zool Soc Lond 20: 143–157Google Scholar
  8. Clark AM, Rowe FWE (1971) Monograph of shallow-water Indo-West Pacific echinoderms. Bull Br Mus nat Hist 690: 1–238Google Scholar
  9. Emson RH, Wilkie IC (1980) Fission and autotomy in echinoderms. Oceanogr mar Biol A Rev 18: 155–250Google Scholar
  10. Emson RH, Mladenov PV (1987) Studies of the fissiparous holothurian Holothuria parvula (Selenka) (Echinodermata: Holothuroidea). J exp mar Biol Ecol 111: 195–211Google Scholar
  11. Emson RH, Mladenov PV (1992) Field and laboratory observations on the feeding of Macrophiothrix variabilis (Lamarck) with notes on the feeding of Ophiactis savignyi (Muller and Troschel). In: Morton B (ed) The marine flora and fauna of Hong Kong and southern China III. Hong Kong University, Hong Kong, pp 769–778Google Scholar
  12. Emson RH, Mladenov PV, Wilkie IC (1985) Patterns of reproduction in small Jamaican brittle stars: fission and brooing predominate. NOAA Symp Ser Undersea Res 3: 87–100Google Scholar
  13. Emson RH, Whitfield PJ (1989) Aspects of the life history of a tidal pool population Amphipholis squamata (Ophiuroidea) from South Devon. J mar biol Ass UK 69: 27–41Google Scholar
  14. Emson RH, Wilkie IC (1984) An apparent instance of recruitment following sexual reproduction in the fissiparous brittle star Ophiactis savignyi Muller and Troschel. J exp mar Biol Ecol 77: 23–28Google Scholar
  15. Hendler G (1979) Reproductive periodicity of ophiuroids (Echinodermata: Ophiuroidea) on the Atlantic and Pacific coasts of Panama. In: Stancky SE (ed) Reproductive ecology of marine invertebrates. South Carolina University, South Carolina, pp 145–156Google Scholar
  16. Hendler G (1991) Echinodermata: Ophiuroidea. In: Giese AC, Pearse JS, Pearse VB (eds) Reproduction of marine invertebrates. Vol. VI. Echinoderms and lophophorates. Boxwood, California, pp 355–511Google Scholar
  17. Hendler G, Littman BS (1986) The ploys of sex: relationships among the mode of reproduction, body size and habitats of coral-reef brittle stars. Coral Reefs 5: 31–42Google Scholar
  18. Hymam LH (1955) The invertebrates. Vol. 4. Echinodermata. McGraw-Hill, New YorkGoogle Scholar
  19. Lawrence JM (1980) Numbers and biomass of the common holothuroids on the windward reef flat at Eniwetok Atoll, Marshall Islands. In: Jangoux M (ed) Proceedings of the European Colloquium on Echinoderms. AA Balkema, Rotterdam, pp 201–204Google Scholar
  20. Lawrence JM (1987) A functional biology of echinoderms. Croom Helm, LondonGoogle Scholar
  21. Mladenov PV, Burke RD (1994) Echinodermata: asexual propagation. In: Adiyodi KG, Adiyodi RG (eds). Reproductive biology of invertebrates. Oxford and IBH Publications, New Delhi, pp 339–383Google Scholar
  22. Mladenov PV, Carson SF, Walker CW (1986) Reproductive ecology of an obligately fissiparous population of the sea star Stephanasterias albula (Stimpson). J exp mar Biol Ecol 96: 155–175Google Scholar
  23. Mladenov PV, Emson RH (1984) Divide and broadcast: sexual reproduction in the West Indian brittle star Ophiocomella ophiactoides and its relationship to fissiparity. Mar Biol 81: 273–282Google Scholar
  24. Mladenov PV, Emson RH (1988) Density, size structure and reproductive characteristics of fissiparous brittle stars in algae and sponges: evidence for interpopulational variation in levels of sexual and asexual reproduction. Mar Ecol Prog Ser 42: 181–194Google Scholar
  25. Mladenov PV, Emson RH (1990) Genetic structure of populations of two closely related brittle stars with contrasting sexual and asexual life histories, with observations on the genetic structure of a second asexual species. Mar Biol 104: 265–274Google Scholar
  26. Mladenov PV, Emson RH (1992) Population size structure and the relationship between body zize and fission in the brittle-star Ophiactis savignyi from Hong Kong. In: Morton B (ed) The marine flora and fauna of Hong Kong and southern China III. Hong Kong University, Hong Kong, pp 447–452Google Scholar
  27. Mladenov PV, Emson RH, Colpit LV, Wilkie IC (1983) Asexual reproduction in the West Indian brittle star Ophiocomella ophiactoides (H.L. Clark) (Echinodermata: Ophiuroidea). J exp mar Biol Ecol 72: 1–23.Google Scholar
  28. Munday BW, Keegan BF (1992) Population dynamics of Amphiura chiajei (Echinodermata: Ophiuroidea) in Killary Harbour, on the west coast of Ireland. Mar Biol 114: 595–605Google Scholar
  29. Muus K (1981) Density and growth of juvenile Amphiura filiformis (Ophiuroidea) in the Oresund. Ophelia 20: 153–168Google Scholar
  30. Yamazi I (1950) Autotomy and regeneration in Japanese sea-stars and ophiurans. I. Observation on a sea-star, Coscinasterias acutispina Stimpson and four species of ophiurans. Annotnes zool jap 23: 175–186Google Scholar

Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • S.-M. Chao
    • 1
  • C.-C. Tsai
    • 2
  1. 1.Division of Collection and ResearchNational Museum of Natural ScienceTaichungTaiwan Republic of China
  2. 2.Biology DepartmentTunghai UniversityTaichungTaiwan, Republic of China

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