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| Langlet, D; Alunno-bruscia, Marianne; Rafelis, M; Renard, M; Roux, M; Schein, E; Buestel, Dominique. |
| We present a cathodoluminescence (CL) study of growth layer deposition in the shell of the oyster Crassostrea gigas. CL is based on the physical properties of lattice-bound manganese (Mn2+), which is the main activator in calcium carbonate. Our study involved chemical marking by immersing individuals in seawater to which manganese chloride had been added, and subsequent reading of the shell with CL microscopy coupled with numeric treatment of microphotographs; CL emission was analyzed using a scanning electron microscope coupled to a spectrometer. Since the marking did not harm the oysters, repeated markings were possible, allowing validation of the inferences made from analysis of the shell rings. Oysters reared in a French Mediterranean lagoon (Thau... |
| Tipo: Text |
Palavras-chave: Mediterranean lagoon; Manganese marking; Carbonate biomineraliation; Shell growth; Cathodoluminescence; Oyster. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1979.pdf |
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| Duco, A; Roux, M. |
| An analysis of the individual growth of the deep-sea stalked crinoid of the Norwegian Sea, Bathycrinus carpenreri (Echinodermata) is discussed. Two growth stages appear: the first one is without growth lines, the second shows a succession of growth lines due to cessation or slowing down of growth between growth cycles. X ray photographs reveal growth lines within the ossicles of the stalk. The onset of gonad development would be correlated with the first appearance of growth lines, although gametogenesis could be continuous, as in, most deep-sea species. A hypothesis of annual growth rings and seasonal nutritive flux implies that the oldest specimen analyzed would be from 10 to 15 years old, in agreement with a previous estimate for the isocrinid stalked... |
| Tipo: Text |
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| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/1981/publication-5367.pdf |
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