Small-scale variation in feeding environments for the Manila clam Ruditapes philippinarum in a tidal flat in Tokyo Bay

Satoshi Watanabe, Satoshi Katayama, Masashi Kodama, Naritoshi Cho, Kaoru Nakata, Masaaki Fukuda

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)937-945
Number of pages9
JournalFisheries Science
Volume75
Issue number4
DOIs
Publication statusPublished - 2009 Jul
Externally publishedYes

Keywords

  • Manila clam
  • Microphytobenthos
  • Resuspension
  • Ruditapes philippinarum
  • Stable isotope ratio

ASJC Scopus subject areas

  • Aquatic Science

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