Response of ice krill (Euphausia crystallorophias) density to environmental changes in the Amundsen Sea Coastal Polynya, Antarctica
文献类型： 外文期刊
作者： Yang, Jialiang 1 ; Li, Shuai 1 ; Li, Lingzhi 1 ; Rao, Xin 1 ; Chen, Shuai 1 ; Huang, Hongliang 1 ;
作者机构： 1.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Shanghai 200090, Peoples R China
2.Minist Agr & Rural Affairs, Key Lab Ocean & Polar Fisheries, Shanghai, Peoples R China
关键词： Ice krill (Euphausia crystallorophias); Krill density; Environmental factors; Amundsen sea coastal polynya; Acoustic survey; Distribution of ice krill
期刊名称：DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS （ 影响因子：2.4； 五年影响因子：3.1 ）
ISSN： 0967-0637
年卷期： 2024 年 205 卷
页码：
收录情况： SCI
摘要： The density of ice krill (Euphausia crystallorophias), 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(-2) for each transect (mean value was 5.77 g m(-2) 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.
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