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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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Abnormal forms in the brittle-star Amphipholis squamata: a field study
Dupont, S.; Mallefet, J. (2002). Abnormal forms in the brittle-star Amphipholis squamata: a field study. J. Mar. Biol. Ass. U.K. 82(3): 491-493. dx.doi.org/10.1017/S0025315402005763
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154; e-ISSN 1469-7769, meer
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| Abstract |
Deviation from pentamerism is a rare phenomenon in 5-armed echinoderm species. Qualitative and quantitative data front field observations of 14 populations around the world were used for a biogeographical study of this phenomenon, Four abnormal forms presenting deviation from the classical pentamerism of echinoderms were observed within the brittle-star species Amphipholis squamata (Echinodermata: Ophiuroidea). Although these forms were rare in global populations (0.29%), they call reach important frequencies in some locations. Our results suggest that habitat structure has all influence oil the occurence of abnormal forms. Moreover, deviations from pentamerism are not a heritable character but are a consequence of environmental perturbations oil the metamorphosis of larvae and/or abnormal regeneration of arms. |
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