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首页> 外文期刊>Polar biology >Diel changes in vertical distribution of Oithona similis (Cyclopoida) and Oncaea curvata (Poecilostomatoida) under sea ice in mid-summer near Syowa Station, Antarctica
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Diel changes in vertical distribution of Oithona similis (Cyclopoida) and Oncaea curvata (Poecilostomatoida) under sea ice in mid-summer near Syowa Station, Antarctica

机译：南极Syowa站附近仲夏海冰下Oithona similis（Cyclopoida）和Oncaea curvata（Poecilostomatoida）的垂直分布变化

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摘要

The diel vertical distributions of two small copepods, Oithona similis and Oncaea curvata, were investigated at 4-h intervals over a 24-h period under fast ice near Syowa Station during continuous daylight conditions in the Antarctic mid-summer, December 1993. Oithona similis and O. curvata exhibited small-scale diel vertical migrations during the study period, in a way opposite to what is expected, i.e., remaining mostly in the upper layer during the day and moving into deeper layers at night. The nighttime descent of both species coincided with the time of disappearance of a high algal concentration at the ice-water interface during the day and an increase of the algal concentration in the mid-water layer at night. This suggests the migration behavior of the copepods was responsible for the change of food availability. The daily grazing impact of these copepods was estimated to remove one-third of the algae daily released from ice during mid-summer at Syowa Station.
机译：1993年12月，在南极中部持续白天的条件下，在连续日光条件下，在Syowa站附近的快速冰上，在24小时内以4小时间隔调查了两个小型co足动物Oithona similis和Oncaea curvata的diel垂直分布。在研究期间，O。curvata和O. curvata表现出小范围的diel垂直迁移，这与预期的相反，即白天大部分保留在上层，晚上转移到深层。两种物种的夜间下降都与白天冰水界面上高藻浓度的消失和夜间中层水藻浓度的增加相吻合。这表明co足类的迁移行为是导致食物供应量变化的原因。据估计，这些co足动物的日常放牧影响将消除昭和站仲夏期间每天从冰中释放的藻类的三分之一。

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