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To examine the trophic relationship between the sea squirt Halocynthia roretzi and the Pacific oyster Crassostrea gigas cocultured in suspension, their δ 13 C and δ 15 N values were monitored monthly on the southern coast of Korea for a period of 2 yr. Suspended particulate organic matter was fractionated as coarse (>20 µm, CPOM) and fine particles (<20 µm, FPOM), and the seasonal varia- tions in the δ 13 C and δ 15 N were determined. CPOM δ 13 C was slightly more variable than FPOM δ 13 C over the sampling period, whereas δ 15 N varied less for CPOM than for FPOM. Co- and monocultured sea squirts had a less variable δ 13 C, but a more variable δ 15 N than cocultured oysters over the sam- pling period. The δ 13 C and δ 15 N of cocultured sea squirts were consistently lower than those of cocul- tured oysters. The more pronounced difference in the δ 13 C between the cocultured suspension feed- ers was attributed to a striking isotopic change in oysters during their autumn to winter growing period. Differences in the δ 13 C were significant between co-, monocultured, and wild sea squirts, but not between co- and monocultured oysters. These suspension feeders can use different POM size fractions within the same habitat. The marked 13 C-enrichment in oyster tissues, particularly during their fast growing period, may result from their strong selectivity of diatoms. In contrast, both the 13 C- and 15 N-depleted values in cocultured sea squirts indicate the importance of pico-/nano-size fractions as their dietary components. Size-related patterns in food resource exploitation between the cocul- tured suspension feeders may be due to different particle capture mechanisms.

Isotopic evidence of particle size-dependent food partitioning in cocultured sea squirt Halocynthia roretzi and Pacific oyster Crassostrea gigas