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Reproduction asexuée par scission chez Holothuria atra (Holothuroidea) dans les populations de platiers récifaux
Conand, C.; De Ridder, C. (1990). Reproduction asexuée par scission chez Holothuria atra (Holothuroidea) dans les populations de platiers récifaux, in: De Ridder, C. et al. (Ed.) Echinoderm Research. Proceedings of the Second European Conference on Echinoderms, Brussels, Belgium, 18-21 September 1989. pp. 71-76
In: De Ridder, C. et al. (1990). Echinoderm Research: Proceedings of the Second European Conference on Echinoderms, Brussels, Belgium, 18-21 September 1989. A.A. Balkema: Rotterdam, Brookfield. ISBN 90-6191-141-9. 343 pp.
Available in  Authors 
Document type: Conference paper
Keywords
    Reproduction > Asexual reproduction
    Holothuria (Halodeima) atra Jaeger, 1833 [WoRMS]
    Marine/Coastal
Authors  Top 
  • Conand, C.
  • De Ridder, C.
Abstract
    Holothuria atra is the most common aspidochirotid holothurian on tropical Indo-Pacific reef-flats. Transverse fission followed by regeneration has been studied in populations from New-Caledonia and Papua New Guinea. Fission has been observed in the field in all sizes of individuals at a mean rate of 1 % of the population sampled in New-Caledonia. From the direct observations and from the sizes of recently divided individuals, regenerating the oral or anal end, the position of the split has been located in the anterior 45 %. From the observed fission and regeneration rates in the population, it is infered that external regeneration {disappearance of fission signs) takes about two months. Asexual and sexual reproduction appears to be seasonal. But whereas fission mainly occurs during the cool season, sexual reproduction (from gonad studies) takes place during the warm season. Fission is probably triggered by emersion, during low tides, through dessication and thermal s tress. It is hypothesized that the low water time of the spring tides can explain the seasonality of the fission as this phase of the tide occurs in these localities near the middle of the day in the cool season (and during the night in the warm season).
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