The density of ice krill (), a species of key ecological value, and related environmental factors were observed along two transects in the Amundsen Sea Coastal Polynya (ASCP) in Antarctica. The distribution of ice krill was processed using two-frequency acoustic backscatter data identification, and the target strength of ice krill was calculated via stochastic distorted-wave born approximation based on the ice krill sample. The ice krill density ranged from 0.96 to 11.01 g m for each transect (mean value was 5.77 g m for the entire survey). These results were of a lower order of magnitude than those of a previous study in the same waters, although the ice krill was still the dominant krill specie in this polynya. We contend that the extent of the phytoplankton bloom might be the factor behind this difference, while other hydrographic parameters such as surface temperature and salinity would have some effect on the spatial distribution of ice krill abundance. Meanwhile, the density and height of ice krill abundance suggested that the diurnal effect on the ice krill was almost negligible. According to the fitted results of regression model, the abundance of ice krill in ASCP in 2022 summer was estimated approximately 175,000 tons.

中文翻译：

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南极洲阿蒙森海沿岸冰间湖冰磷虾（Euphausia crystallorophias）密度对环​​境变化的响应

在南极洲阿蒙森海沿岸冰间湖（ASCP）的两条样带上观察了具有重要生态价值的物种冰磷虾（）的密度和相关环境因素。利用二频声波后向散射数据识别处理冰磷虾的分布，并根据冰磷虾样本通过随机畸变波生近似计算冰磷虾的目标强度。每个样带的冰磷虾密度范围为 0.96 至 11.01 克（整个调查的平均值为 5.77 克）。尽管冰磷虾仍然是该冰间湖中的主要磷虾种类，但这些结果的数量级低于之前在同一水域进行的研究。我们认为，浮游植物繁殖的程度可能是造成这种差异的因素，而其他水文参数，例如表面温度和盐度，会对冰磷虾丰度的空间分布产生一定影响。同时，冰磷虾丰度的密度和高度表明，对冰磷虾的昼夜影响几乎可以忽略不计。根据回归模型拟合结果，估计2022年夏季ASCP中冰磷虾的丰度约为17.5万吨。