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| Perissinotto, R.; Mayzaud, P.; Nichols, P. D.; Labat, J. P.. |
| Pyrosomas are colonial tunicates capable of forming dense aggregations. Their trophic function in the ocean, as well as their ecology and physiology in general, are extremely poorly known. During the ANTARES-4 survey (January and February 1999) their feeding dynamics were investigated in the south Indian Ocean. Results show that their in situ clearance rates may be among the highest recorded in any pelagic grazer, with up to 35 1 h(-1) per colony (length: 17.9 +/- 4.3 [SD] cm). Gut pigment destruction rates, estimated for the first time in this tunicate group, are higher than those previously measured in salps and appendicularians, ranging from 54 to virtually 100% (mean: 79.7 +/- 19.8 %) of total pigment ingested. Although individual colony ingestion... |
| Tipo: Text |
Palavras-chave: Pyrosoma; Pelagic tunicates; Gut pigment content; Gut turnover time; Ingestion rates; Clearance rates; Lipid content; Agulhas Front. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00236/34736/33179.pdf |
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| Fournier, Jonathan; Dupuy, Celie; Bouvy, Marc; Couraudon-reale, Marine; Charpy, Loic; Pouvreau, Stephane; Le Moullac, Gilles; Le Pennec, Marie-annick; Cochard, Jean-claude. |
| In atoll lagoons of French Polynesia, growth and reproduction of pearl oysters are mainly driven by plankton concentration. However, the actual diet of black-lip pearl oysters P. margaritifera in these lagoons is poorly known. To fill this gap, we used the flow through chamber method to measure clearance rates of P. margaritifera in Ahe atoll lagoon (Tuamotu Archipelago, French Polynesia). We found : (i) that pearl oysters cleared plankton at a rate that was positively related to plankton biovolume, (ii) that nanoflagellates were the main source of carbon for the pearl oysters, (iii) that the quantity and origin of carbon filtrated by pearl oysters was highly dependent on the concentration and composition of plankton. These results provide essential... |
| Tipo: Text |
Palavras-chave: Pinctada margaritifera; Clearance rates; French Polynesia; Phytoplankton; Protists. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00078/18888/16599.pdf |
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