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Food Sources for Ruditapes philippinarum in a Coastal Lagoon Determined by Mass Balance and Stable Isotope Approaches

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Title: Food Sources for Ruditapes philippinarum in a Coastal Lagoon Determined by Mass Balance and Stable Isotope Approaches
Authors: Komorita, Tomohiro Browse this author
Kajihara, Rumiko Browse this author
Tsutsumi, Hiroaki Browse this author →KAKEN DB
Shibanuma, Seiichiro Browse this author
Yamada, Toshiro Browse this author
Montani, Shigeru Browse this author →KAKEN DB
Issue Date: 28-Jan-2014
Publisher: Public library science
Journal Title: Plos one
Volume: 9
Issue: 1
Start Page: 1
End Page: 11
Publisher DOI: 10.1371/journal.pone.0086732
Abstract: The relationship between the food demand of a clam population (Ruditapes philippinarum (Adams & Reeve 1850)) and the isotopic contributions of potential food sources (phytoplankton, benthic diatoms, and organic matter derived from the sediment surface, seagrass, and seaweeds) to the clam diet were investigated. In particular, we investigated the manner in which dense patches of clams with high secondary productivity are sustained in a coastal lagoon ecosystem (Hichirippu Lagoon) in Hokkaido, Japan. Clam feeding behavior should affect material circulation in this lagoon owing to their high secondary productivity (ca. 130 g C m(-2) yr(-1)). Phytoplankton were initially found to constitute 14-77% of the clam diet, although phytoplankton nitrogen content (1.79-4.48 kmol N) and the food demand of the clam (16.2 kmol N d(-1)) suggest that phytoplankton can constitute only up to 28% of clam dietary demands. However, use of isotopic signatures alone may be misleading. For example, the contribution of microphytobenthos (MPB) were estimated to be 0-68% on the basis of isotopic signatures but was subsequently shown to be 35 +/- 13% (mean +/- S.D.) and 64 +/- 4% (mean +/- S.D.) on the basis of phytoplankton biomass and clam food demand respectively, suggesting that MPB are the primary food source for clams. Thus, in the present study, the abundant MPB in the subtidal area appear to be a key food source for clams, suggesting that these MPB may sustain the high secondary production of the clam.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 門谷 茂

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