Small-scale variation in feeding environments for the Manila clam <Emphasis Type="Italic">Ruditapes philippinarum</Emphasis> in a tidal flat in Tokyo Bay |
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Authors: | Satoshi Watanabe Satoshi Katayama Masashi Kodama Naritoshi Cho Kaoru Nakata Masaaki Fukuda |
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Institution: | (1) Japan International Research Center for Agricultural Sciences, Tsukuba Ibaraki, 305-8686, Japan;(2) National Research Institute of Fisheries Science, Yokosuka Kanagawa, 238-0316, Japan;(3) National Research Institute of Fisheries Science, Yokohama Kanagawa, 236-8647, Japan;(4) Hokkaido National Fisheries Research Institute, Kushiro Hokkaido, 085-0802, Japan |
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Abstract: | The relative contribution of particulate organic matters (POMs) in water column and sediment as a food source for the Manila
clam, Ruditapes philippinarum, was studied using carbon and nitrogen stable isotopic method (δ13C and δ15N) in a tidal flat at Seaside Park, Yokohama, Japan. Comparisons of δ13C and δ15N among R. philippinarum and POMs in surface water, bottom water, and sediment surface indicated that R. philippinarum larger than 5 mm shell length (SL) mainly assimilated benthic POM, and individuals smaller than 5 mm SL assimilated benthic
and pelagic POM. Continuous measurements of chlorophyll concentrations in the bottom water revealed tide-driven resuspension
of the benthic phytopigments. R. philippinarum showed differences in δ13C and δ15N along an inshore–offshore transect, indicating small-scale spatial differences in POM provision in the tidal flat. These
findings suggest that POM in the bottom water, supposedly inhaled by R. philippinarum, is a mixture of a larger proportion of resuspended benthic POM and a smaller proportion of pelagic POM, and that the mixing
ratio of the POMs may be affected by the hydrodynamics of flooding water associated with tidal flat topography. |
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Keywords: | Manila clam Microphytobenthos Resuspension Ruditapes philippinarum Stable isotope ratio |
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