School of Ocean Science, University of Science and Technology, Daejeon, Korea.
Marine Ecosystem Research Center, KIOST, Busan, Korea.
PLoS One. 2020 Feb 10;15(2):e0228873. doi: 10.1371/journal.pone.0228873. eCollection 2020.
The manila clam Ruditapes philippinarum is widely distributed in the sandy mud sediments of tidal flats and plays a role in seawater purification by filtering suspended organic matter. This study was designed to evaluate differences in seawater purification based on the filtration rate of the manila clam in terms of particulate organic matter (POM) between two tidal flats with different hydrographic regimes. In situ experiments were carried out at Geunso and Sihwa tidal flats, along the west coast of Korea. The amount of POM removed from the water column by the feeding activity of the clam was measured in the field using a closed circulation chamber. The filtration rate of clams for POM at Sihwa tidal flat (2.86 for POC, 2.29 for PON and 5.46 L h-1 gDW-1 for Chl a) was higher than that at Geunso tidal flat (0.61 for POC, 0.89 for PON and 2.54 L h-1 gDW-1 for Chl a) which resulted from differences in the hydrographic regime, including tide characteristics, current speed and submergence time, and food quantity and quality. The current speed was much greater at Geunso tidal flat than at Sihwa tidal flat, but the submergence time by tide was longer at the latter site than the former, resulting in different feeding times for clams. The food quantity in terms of chlorophyll a was higher at Sihwa tidal flat than at Geunso tidal flat, and the food quality based on the C/N ratio of POM was better at the former site than the latter, with values of 12.8 and 15.6, respectively. These findings suggest that hydrographic regime could be important in understanding in situ filtration rates of R. philippinarum.
菲律宾蛤仔（Ruditapes philippinarum）广泛分布于潮间带的沙泥沉积物中，通过过滤悬浮有机物在海水净化中发挥作用。本研究旨在评估两个具有不同水文学特征的潮滩中，菲律宾蛤仔对颗粒物有机物（POM）的过滤速率差异对海水净化的影响。在韩国西海岸的全州和始华潮滩进行了现场实验。使用封闭循环室在现场测量了水层中由于蛤仔摄食活动而去除的 POM 量。始华潮滩的菲律宾蛤仔对 POM 的过滤速率（POC 为 2.86、PON 为 2.29 和 Chl a 为 5.46 L h-1 gDW-1）高于全州潮滩（POC 为 0.61、PON 为 0.89 和 Chl a 为 2.54 L h-1 gDW-1），这是由于水文学特征的差异，包括潮汐特征、流速和淹没时间以及食物数量和质量。全州潮滩的流速远高于始华潮滩，但后者的潮汐淹没时间比前者长，导致蛤仔的摄食时间不同。始华潮滩的叶绿素 a 含量较高，POM 的 C/N 比值较好，分别为 12.8 和 15.6。这些发现表明，水文学特征在理解菲律宾蛤仔的原位过滤速率方面可能很重要。
