Open WL Archief (OWA)

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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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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., meer

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 301035 [ download pdf ]
Documenttype: Congresbijdrage

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Trefwoorden

Reproduction > Asexual reproduction Holothuria (Halodeima) atra Jaeger, 1833 [WoRMS] Marien/Kust

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Auteurs		Top
Conand, C. De Ridder, C., meer

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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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