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Caractérisation du comportement chimique du complexe otosac-otolithe et réaction à des perturbations induites. ArchiMer
Edeyer, Anaick.
Teleost fish have the capacity to record in their otoliths, calcareous concretions located in the inner ear, the principal events (environmental and physiological) which punctuate their life. Otolith is made of CaC03 deposits on a protein matrix according to a circadian rhythm. Due to the quasi irreversibility of this process, otoliths can be compared to biological archives largely used to apprehend the fish ecology. The otolith bathes in the endolymph, a medium in which all the precursors of otolith formation forward. The endolymph chemical analysis revealed a heterogeneity of its principal components (proteins, total C02 and total Ca) which origin lies in the non uniform spatial distribution of the ionocytes in the saccular epithelium. Thus, in...
Tipo: Text Palavras-chave: Environmental disturbances; Microchemistry; Biomineralisation; Psetta maxima; Fish; Calcification; Endolymph; Otolith; Perturbations environnementales; Microchimie; Biominéralisation; Psetta maxima; Poisson; Calcification; Endolymphe; Otolithe.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/rapport-1123.pdf
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Daily variations of the saccular endolymph and plasma compositions in the turbot Psetta maxima: relationship with the diurnal rhythm in otolith formation ArchiMer
Edeyer, Anaick; De Pontual, Helene; Payan, P; Troadec, Herve; Severe, Armelle; Mayer-gostan, N.
We studied the circadian variations of the ionic composition ([Na+], [K+], [Cl-]), total CO2 ([tot CO2]), and protein concentration ([protein]) in the plasma and endolymph in the distal and proximal sides of the sacculus in the turbot Psetta maxima. Daily variations in total plasma calcium ([tot Ga]) were also recorded. Significant diurnal fluctuations occurred in most parameters and the spatial heterogeneity of the endolymph composition was maintained throughout a 24 h period. The main parameters implicated in otolith calcification, endolymph [tot CO2] and endolymph [protein], fluctuated diurnally, [tot CO2] was highest and [protein] lowest at night; the relative concentrations were reversed during the day. The inverse, alternating relationship of maximal...
Tipo: Text Palavras-chave: Daily cycle; Endolymph; Otolith; Chemical composition; Teleost.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00000/10572/7603.pdf
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