THE EFFECTS OF A DELAY IN INITIATION OF FEEDING ON THE LARVAL DEVELOPMENT OF THE SEA-URCHIN PARACENTROTUS-LIVIDUS
| Autor: | Fenaux, L, DEGREEF, Y, CELLARIO, C |
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| Přispěvatelé: | Station Zoologique de Villefranche, Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 1992 |
| Předmět: | |
| Zdroj: | INTERNATIONALE REVUE DER GESAMTEN HYDROBIOLOGIE INTERNATIONALE REVUE DER GESAMTEN HYDROBIOLOGIE, 1992, 77 (4), pp.651-663. ⟨10.1002/iroh.19920770409⟩ |
| DOI: | 10.1002/iroh.19920770409⟩ |
| Popis: | 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 (C0) 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 greater-than-or-equal-to 1. This higher ration can be used to estimate the age of natural populations of larvae. |
| Databáze: | OpenAIRE |
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