Food demand of the clam (<i>Ruditapes philippinarumm</i>) and total amount of potential food sources during the productive season.

<p>Area: entire (3.56 km²), subtidal (3.37 km²), and tidal-flat (0.19 km²).</p

Estimation of the rate of filtration by the clam (<i>Ruditapes philippinarum</i>) in Hichirippu Lagoon during productive season.

<p>Standard deviations for biomass Chl-<i>a</i> are indicated inparentheses.</p

A dual isotope plot for carbon and nitrogen for the expected diet of the clam (<i>Ruditapes philippinarum</i>) and their potential food sources in Hichirippu Lagoon.

<p>See text in Materials and methods for diet-tissue fractionation for the clam to determine expected diet (<i>R. philippinarum</i>). Error bars are standard deviations.</p

Seasonal variation of the clam (<i>Ruditapes philippinarum</i>) population at tidal flats stations.

<p>(a) biomass (kgWW m^–2) and (b) secondary productivity (g C m^–2 d^–1) of the clam at five tidal flat stations, expressed as box plots.</p

Seasonal variation of growth of the clam (<i>Ruditapes philippinarum</i>) at station B.

<p>Changes in (a) mean shell length of each cohort of the clam <i>Ruditapes philippinarum</i> and (b) daily secondary productivity and P/B_kgWW at station B.</p

Size–frequency distribution of <i>Ruditapes philippinarum</i> population at station B.

<p>The left and right scales correspond to samples obtained using mesh sizes of 1 and 5(C = cohorts; n = number of individuals).</p

Scatter plot illustrating the relationship between the contributions of phytoplankton and other food sources.

<p>(a) MPB, (b) SOM, (c) <i>U. pertusa</i>, and (d) <i>Z. japonica</i>. Solid lines and grey region indicate mean and standard deviations for every 1% increase of POM contribution, respectively. Vertical dotted line indicates the upper limit to the phytoplankton contribution based on their abundance and the food demand of the clam.</p

Study area and locations of sampling stations.

<p>The oval and rectangular grey areas represent naturally occurring (stations A and B) and artificial tidal flats (the other stations), respectively.</p