par Fenaux, Lucienne;De Greef, Yves 
;Cellario, Christiane
Référence Internationale Revue der gesamten Hydrobiologie und Hydrographie, 77, 4, page (651-663)
Publication Publié, 1992
;Cellario, ChristianeRéférence Internationale Revue der gesamten Hydrobiologie und Hydrographie, 77, 4, page (651-663)
Publication Publié, 1992
Article révisé par les pairs
| Résumé : | The growth of the skleleton and changes in biochemical constituents (proteins, carbohydrates and lipids) were observed in embryos (days 0 and 1) and larvae (2‐8 days) of the sea urchin Paracentrotus lividus that were starved (C 0) or fed low (1,000 cells of Hymenomonas elongata, C 1) or high (5,000 cells, C 5). Different batches of C 1 and C 5 larvae were fed first the 2nd, 3rd, 4th or 5th day after fertilization. Initiation of feeding 24 h after hatching slowed down the rate of increase in length of the larval appendages. A differential growth of skeletic rods (somatic and postoral rods) and variations in proteins weights shows the existence of a mixotrophic phase between endotrophic and planktotrophic phases. Best development occured in larvae which were first fed at the lower food level 24 h after hatching. On the 2nd and the 3rd day the somatic/postoral rod ratio is ≥1. This higher ration can be used to estimate the age of natural populations of larvae. Copyright © 1992 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim |
