In situ grazing rate of the copepod population in the western subarctic North Pacific during spring
In situ grazing rate of the copepod population in the western subarctic North Pacific during spring
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北太平洋西亚北极地区春季桡足类种群的原地放牧率
DOI：
10.1007/bf00349680
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发表时间：
1994
期刊：
影响因子：
2.4
通讯作者：
H. Sugisaki
中科院分区：
文献类型：
--
作者：
A. Tsuda;H. Sugisaki
1991年春季，用多层浮游生物采样器对北太平洋西部海域的浮游生物进行了时间序列采样。分布在上层混合层，而分布在上层混合层。白背飞虱昼夜主要分布在120~300m之间。而太平洋Metridia、Pleuromama scarullata和Gaetanus Simple则表现出明显的昼夜垂直迁徙。同时用肠道荧光法测定放牧活动。在夜间观察到了食性迁徙物种的食性，新银鱼没有昼夜摄食节律，肠道荧光较弱，在观察期间被认为是休眠的。估计桡足类种群对浮游植物的摄食率为初级生产量的1.4~2.0%，代谢需要量为初级生产量的8.3~12.4%。这些事实表明，作为主要消费者，桡足类种群并不重要，而微型浮游动物在维持西亚北极太平洋浮游植物低蓄积量和高营养浓度方面发挥着重要得多的作用。
Time series sampling with a multi-layer plankton sampler was carried out in the western subarctic North Pacific during spring 1991.Neocalanus cristatus, N. flemingeriandEucalanus bungiidominated and accounted for 88.5% of the copepod population in volume.Neocalanus spp. were distributed in the upper mixed layer, whileE. bungiiwas mainly distributed between 120 and 300 m throughout the day and night. In contrast,Metridia pacifica, Pleuromamma scutullataandGaetanus simplexshowed clear diel vertical migration. Grazing activities were estimated simultaneously by gut fluorescence. Nocturnal grazing was observed for diel migrating species.Neocalanus spp.did not have a diel feeding rhythm and had relatively low gut fluorescence.E. bungiiwas considered to be dormant during the observation period. The estimated grazing rate of the copepod population on phytoplankton was 1.4 to 2.0% of the primary production while the metabolic requirement was 8.3 to 12.4% of the primary production. These facts suggest that the copepod population was unimportant as primary consumers and that microzooplankton plays a much more important role in sustaining low standing stock of phytoplankton and a high nutrient concentration in the western subarctic Pacific Ocean.