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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Reevaluation of the nutrient mineralization process by infaunal bivalves (Ruditapes philippinarum) in a shallow lagoon in Hokkaido, Japan
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Reevaluation of the nutrient mineralization process by infaunal bivalves (Ruditapes philippinarum) in a shallow lagoon in Hokkaido, Japan

机译：重新评估日本北海道浅泻湖中的不育双壳类动物（Ruditapes philippinarum）的营养矿化过程

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摘要

Previous estimations of nutrient mineralization in the water column by infaunal bivalves might have been overestimated because of underestimation of the uptake process by microphytobenthos in the field. We conducted field surveys of environmental conditions and quantitative sampling of Ruditapes philippinarum in a shallow lagoon system (Hichirippu Lagoon, eastern Hokkaido, Japan) in August 2006. We recorded the spatial distribution pattern and the molar ratio of dissolved inorganic nutrients to determine the limiting nutrients for microphytobenthos, to evaluate the input and output of nutrients at the entrance of the lagoon station, and to estimate potential nutrient mineralization by R. philippinarum. Our aim was to reevaluate the nutrient mineralization process by infaunal bivalve species. In this study, the mean standing stock of microphytobenthos inhabiting surface sediment (5 mm thick) on the tidal fiats was 100 times higher than that of phytoplankton (1 m depth). Low N/P and high Si/N ratios (mean = 2.6 and 17.6, respectively) near the entrance of the lagoon compared to those of microphytobenthos (N:P:Si = 10.1:1:18) clearly suggest N deficiency. The flux of NH_4-N coming into the lagoon was 3.4 kmolN d~(-1), and the flux out was -3.7 kmolN d~(-1). Thus, assuming that there would have been no phytoplankton and microphytobenthos uptake during the day, 0.3 kmolN d~(-1) of NH_4-N was produced within the lagoon. However, the NH_4-N mineralization rate of the clams has been estimated to be approximately 7.7 ± 6.8 kmolN d~(-1). Thus, 96% (7.4 kmolN d~(-1), i.e., 7.7 kmolN d~(-1) minus 0.3 kmolN d~(-1)) of the NH_4-N mineralized by the clam was consumed by microphytobenthos. In contrast, if all the NH_4-N inflow (3.1 kmolN d~(-1)) was consumed by the microalgae before outflow, 52% (4.0kmolN d~(-1), i.e., 7.7kmolN d~(-1) minus 3.7kmolN d~(-1)) of the NH_4-N mineralized by the clams should have been consumed by microphytobenthos. Microphytobenthos on the tidal flats (11.3 ± 11.8 kmolN) used all of the surplus nutrients (between 4.0 and 7.4 kmolN d~(-1)), and the temporal division rate [ = (NH_4-N uptake )/(standing stock of microphytobenthos)] of microphytobenthos would have to be between 0.35 and 0.65 d~(-1). Residual NH_4-N (0.3-3.7 kmolN d~(-1)) was the water-column source and accounted for 12-148% of NH_4-N in the water column near the entrance of the lagoon (2.5±1.4kmolN) per day. This is the first field-based observation with a quantitative evaluation of nutrient mineralization by infaunal bivalves and nutrient uptake by microphytobenthos.
机译：由于野外微型底栖动物对摄取过程的低估，以前对不佳双壳类动物在水柱中矿化养分的估计可能被高估了。 2006年8月，我们在浅水泻湖系统（日本北海道东部日立浦泻湖）中进行了菲律宾蛤仔的环境条件的现场调查和定量采样。我们记录了空间分布模式和溶解的无机养分的摩尔比，以确定极限养分。对于微藻类底栖动物，要评估泻湖站入口处养分的输入和输出，并估算菲律宾蛤可能产生的养分矿化。我们的目的是重新评估不育双壳类动物的营养矿化过程。在这项研究中，潮汐平面上栖息于表层沉积物（5毫米厚）的微底栖鱼类的平均存量比浮游植物（1 m深度）高100倍。与微植物底栖动物相比（N：P：Si = 10.1：1：18），泻湖入口附近的低N / P和高Si / N比（分别分别为2.6和17.6）明确表明了氮的缺乏。 NH_4-N进入泻湖的通量为3.4 kmolN d〜（-1），流出的通量为-3.7 kmolN d〜（-1）。因此，假设白天没有浮游植物和微小底栖动物的摄取，则在泻湖内会产生0.3 kmolN d _（-1）的NH_4-N。然而，据估计蛤的NH_4-N矿化速率约为7.7±6.8 kmolN d〜（-1）。因此，蛤仔矿化的NH_4-N的96％（7.4 kmolN d〜（-1），即7.7 kmolN d〜（-1）减去0.3 kmolN d〜（-1））被微植物底栖动物消耗。相反，如果全部NH_4-N流入量（3.1 kmolN d〜（-1））在流出前被微藻消耗掉，则52％（4.0kmolN d〜（-1），即7.7kmolN d〜（-1）蛤类所矿化的NH_4-N的负3.7kmolN d〜（-1））应该已经被微型藻类消耗掉了。潮滩上的微型底栖动物（11.3±11.8 kmolN）使用了所有剩余养分（4.0至7.4 kmolN d〜（-1）之间），并且时空分度[=（NH_4-N摄取）/（微型底栖动物的种群数量） ）]的微底栖动物必须在0.35至0.65 d〜（-1）之间。残留的NH_4-N（0.3-3.7 kmolN d〜（-1））是水柱源，占泻湖入口附近水柱中（2.5±1.4kmolN）NH_4-N的12-148％天。这是第一个基于野外的观测，定量评估了不育双壳类动物的营养矿化和微藻类底栖动物的营养吸收。

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