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Premiers bilans de production organique et de calcification d'un récif-barrière de la Polynésie Française 5
Sournia, A; Delesalle, B; Ricard, M.
Tipo: Text
Ano: 1981 URL: http://archimer.ifremer.fr/doc/00121/23250/21081.pdf
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Phytoplankton composition and selective feeding of the pearl oyster Pinctada margaritifera in the Takapoto lagoon (Tuamotu Archipelago, French Polynesia): in situ study using optical microscopy and HPLC pigment analysis 5
Loret, P; Pastoureaud, Annie; Bacher, Cedric; Delesalle, B.
The in situ diet of the pearl oyster Pinctada margarifera was determined in the lagoon of Takapoto Atoll by comparing the phytoplankton composition of water and bivalve gut contents using 2 different methods, optical microscopy and HPLC pigment analysis. In order to evaluate the available food resources for pearl oysters in the water column, a new method for estimating the pigment/chlorophyll a (chl a) ratio (based on an inverse analysis) was developed which allowed us to determine the contribution of the main phytoplanktonic groups in terms of chi a. In the water, picocyanobacteria and nanoflagellates predominated, the latter being mainly chlorophytes and prymnesiophytes. Comparisons between the results obtained by the 2 methods of investigation indicated...
Tipo: Text Palavras-chave: Pearl oyster Pinctada margaritifera; Selective feeding; Natural diet; Phytoplankton pigments; Coral reefs; French Polynesia.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00000/10992/7606.pdf
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Diversity and toxic potential of algal bloom-forming species from Takaroa lagoon (Tuamotu, French Polynesia): a field and mesocosm study 5
Rodier, M; Longo, S; Henry, K; Ung, A; Lo-yat, Alain; Darius, Ht; Viallon, J; Beker, B; Delesalle, B; Chinain, M.
Pearl farming lagoons are economically important, yet poorly studied ecosystems in French Polynesia. This paper describes a study conducted in 2016 in Takaroa (Tuamotu Archipelago), an atoll recurrently affected by harmful algal bloom (HAB) events. The objectives were to gain insight into phytoplankton community composition, identify the main bloom-forming species and investigate their potential for toxicity. A mesocosm approach was used to assess the response of phytoplankton communities to 3 nutrient treatments: Conway with Si, Si-depleted f/2 and a commercial N-P fertilizer. In total, 87 morpho-species were described from Takaroa lagoon, with dinoflagellates as the most diverse group. Diatoms (Extubocellulus sp., Cylindrotheca closterium, Nitzschia...
Tipo: Text Palavras-chave: Phytoplankton; Taxonomy; Mesocosm; Bloom-forming species; Toxicity; French Polynesian lagoons.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00499/61059/64509.pdf
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