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Food sources of the pearl oyster in coastal ecosystems of Japan: Evidence from diet and stable isotope analysis |
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| Authors: | Kayoko Fukumori Misa Oi Hideyuki Doi Noboru Okuda Hitomi Yamaguchi Michinobu Kuwae Hitoshi Miyasaka Kenji Yoshino Yoshitsugu Koizumi Koji Omori Hidetaka Takeoka |
| Institution: | 1. Center for Marine Environmental Studies (CMES), Ehime University, 2-5 Bunkyo-cho, Matsuyama 790-8577, Japan;2. LAFWEDY, Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, Japan;3. Center for Ecological Research, Kyoto University, 509-3, 2-chome, Hirano, Otsu, Shiga 520-2113, Japan;4. Ariake Sea Research Project, Saga University, Honjomachi 1, Saga 840-8502, Japan;5. Ehime Prefectural Fisheries Experimental Station, Shitaba, Uwajima 798-0104, Japan |
| Abstract: | We estimated the composition of two food sources for the cultured pearl oyster Pinctada fucata martensii using stable isotopes and stomach content analysis in the coastal areas of the Uwa Sea, Japan. The δ13C values of oysters (−17.5 to −16.8‰) were intermediate between that of particulate organic matter (POM, −20.2 to −19.1‰) and attached microalgae on pearl cages (−13.0‰). An isotope mixing model suggested that oysters were consuming 78% POM (mainly phytoplankton) and 22% attached microalgae. The attached microalgal composition of the stomach content showed a strong resemblance to the composition of that estimated through the isotope mixing model, suggesting preferential utilization of specific components is unlikely in this species. These results indicate that P. fucata martensii feed on a mixture of phytoplankton and attached microalgae, and that the attached microalgae on pearl cages can serve as an important additional food source. |
| Keywords: | isotope mixing model stable isotope analysis phytoplankton attached microalgae benthic microalgae Pinctada fucata martensii marine coastal ecosystem |
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