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首页> 外文期刊>Estuarine Coastal and Shelf Science >Within-day and seasonal patterns of microphytobenthos biomass determined by co-measurement of sediment and water column chlorophylls in the intertidal mudflat of Nanaura, Saga, Ariake Sea, Japan
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Within-day and seasonal patterns of microphytobenthos biomass determined by co-measurement of sediment and water column chlorophylls in the intertidal mudflat of Nanaura, Saga, Ariake Sea, Japan

机译：通过共同测量日本有明海佐贺县那浦市潮间带滩涂沉积物和水柱叶绿素的含量，确定了微底栖生物量的日内和季节模式

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摘要

The microphytobenthos biomass was examined at a fixed site on the Nanaura mudflat, Ariake Sea over 9 months at intervals of 2—3 weeks. During the course of 16 surveys, samples were collected in daytime at intervals of < 1 h for measurement of chlorophylls (Chl a and pheopig-ments) in sediment (during exposure; n = 98) and water column (during ebb, n = 86; flood, n = 95). We found a clear temporal pattern in within-day sediment Chl a indicating net increase of microphytobenthos biomass in surface sediment during a single-daytime exposure. The significant biomass increase was clearly observed during the winter period, but weakened during the rest of the periods. Pheopigments in sediment showed much greater within-day variation compared to corresponding Chl a, with relatively great fluctuation from summer to early fall. However, during fall—winter periods, the sediment pheopigments showed within-day variation, similar to corresponding Chl a, indicating a biomass-dependent degradation approaching winter season. Overall, winter peak of Chl a (176 mg m~(-2)) and summer peak of pheopigments (596 mg m~(-2)) in sediment were characteristic in the Nanaura mudflat, Ariake Sea. In general, seasonal patterns for water column chlorophylls were similar to those for sediment chlorophylls, with winter peak of Chl a (174 μg L~(-1)) and summer maximum of pheopigments (206 μg L~(-1)), respectively. Typically, monthly mean water Chl a (during flood) was significantly correlated with monthly mean sediment Chl a (during exposure), indicating an entrainment of sediment Chl a to the water column during flood by tidal resuspension. Calculations indicated that ca. 66% of Chl a in the water column could be benthic-derived from the surface sediment, on average (n = 181), supporting a significant contribution of microphytobenthos biomass and production in intertidal mudflat ecosystem.
机译：在9个月的2-3周内，在有明海Nanaura滩涂的固定位置检查了微底栖藻的生物量。在16次调查过程中，以小于1小时的时间间隔在白天进行采样，以测量沉积物（暴露期间； n = 98）和水柱（退潮期间n = 86）中的叶绿素（Chl a和色粉）。 ；洪水，n = 95）。我们在一天内的沉积物Chl a中发现了清晰的时间模式，表明在单日暴露期间表面沉积物中的微底栖生物量净增加。在冬季期间，明显观察到生物量的显着增加，但在其余时段中减弱。与相应的Chla相比，沉积物中的色素沉淀表现出更大的日内变化，从夏季到初秋波动较大。但是，在秋冬期间，沉积物的表观色素显示出日内变化，类似于相应的Chla，表明接近冬季的生物量依赖性降解。总体上，有明海纳纳拉泥滩的特征在于，沉积物中Chla的冬季高峰（176 mg m〜（-2））和浅色色素的夏季高峰（596 mg m〜（-2））具有特征性。一般而言，水柱叶绿素的季节模式与沉积物叶绿素的季节模式相似，分别为Chl a的冬季高峰（174μgL〜（-1））和夏季的色素最大（206μgL〜（-1））。 。通常，每月平均水Chla（洪水期间）与每月平均沉积物Chlaa（暴露期间）显着相关，这表明潮汐重悬期间洪水期间泥沙Chla夹带到水柱中。计算表明，约。平均而言，水柱中Chla的66％可能来自底栖底栖生物（n = 181），这支持了潮间带滩涂生态系统中微小底栖生物的生物量和产量的显着贡献。

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