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- W1964007851 abstract "Particulate matter in Takapoto lagoon waters: potential food for cultivated pearl oysters. Results of research concerning the food of the pearl oyster Pinctada margaritifera are presented, by taking Takapoto atoll (Tuamotu archipelago, French Polynesia) as a study site. Monthly sampling of several parameters representative of bivalve environment and food (water temperature, salinity, mineral and organic matter, proteins, lipids and carbohydrates, chlorophyll a and phaeopigments) confirm and increase knowledge of the Takapoto lagoon hydrobiology. The variability of these parameters was analysed. Takapoto lagoon showed a remarkable spatial stability. Temporal variations showed a low seasonal trend. Local meteorology (wind, precipitation) had an influence on short-term variability (especially for mineral matter). Night and day rhythm also affected some parameters (temperature, chlorophyll a, lipids and carbohydrates). In this shellfish environment, carrying capacity appears to be low: organic matter is around 0.35 mg·L−1, chlorophyll a concentration is below 0.30 μg·L−1 and energetic content of particulate material in waters, approx. 2 J·L−1, is ten times lower than in temperate areas. On the other hand, seasonal effect is reduced and particulate food is always available. Preliminary results on carrying capacity show that cultivated pearl oysters play an insignificant role on the system in comparison with the natural trophic bivalve population. © 2000 Ifremer / CNRS / IRD / Éditions scientifiques et médicales Elsevier SASPinctada margaritifera / suspended matter / carrying capacity / pearl oyster / atoll La richesse nutritive des milieux lagonaires vis-à-vis des élevages d’huı̂tres perlières, Pinctada margaritifera, a été analysée en prenant le lagon de Takapoto (archipel des Tuamotu, Polynésie française) comme site d’étude. L’échantillonnage mensuel de plusieurs paramètres représentatifs du milieu de vie et de la nourriture des huı̂tres perlières (température de l’eau, salinité, matière minérale et organique, protéines, lipides, glucides, chlorophylle a et phéopigments) permet de confirmer et d’affiner les connaissances concernant l’hydrobiologie du lagon de cet atoll. L'analyse de la variabilité de ces paramètres montre, sur la période considérée (1990–1991), une remarquable homogénéité spatiale du milieu. La variabilité saisonnière est peu marquée, la météorologie locale (vent, précipitations) influence les variations à court terme (matière minérale), et un rythme nycthéméral affecte certains paramètres (température, chlorophylle a, lipides et glucides). Compte tenu des critères habituels utilisés pour les mollusques bivalves, la capacité nutritive du milieu paraı̂t faible: la matière organique particulaire ne représente que 0,35 mg·L−1, la concentration en chlorophylle a est inférieure à 0,30 μg·L−1 et le contenu énergétique de l’eau, relativement au matériel particulaire, est environ dix fois plus faible (en moyenne de 2 J·L−1) que dans les zones tempérées. En revanche, les variations temporelles étant faibles, la nourriture particulaire est toujours disponible. De premiers éléments de calculs en terme de capacité trophique montrent que les élevages d’huı̂tres perlières jouent un rôle négligeable au sein de l’écosystème par rapport aux stocks naturels de bivalves compétiteurs." @default.
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- W1964007851 date "2000-04-01" @default.
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- W1964007851 title "La matière particulaire des eaux du lagon de Takapoto: nourriture potentielle pour les élevages d’huı̂tres perlières" @default.
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