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The potential distribution of adult Antarctic krill in the Amundsen Sea

  • Ecology
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Abstract

Antarctic krill is the key species of ecological system in the Amundsen Sea. At present, the suitable distribution is unobtainable by scientific surveys or data from the fishery. In this paper, the maximum entropy algorithm (Maxent) was used to obtain the potential distribution of adult Antarctic krill in order to provide useful information and reasonable reference for the policy on protecting potential krill habitats around the Amundsen Sea. Occurrence points and 17 environmental variables were used to simulate the distributions. Results show that the high and moderate suitable habitats lie between 65°S and 72°S in the Amundsen Sea. The high suitable habitat accounts for 8.1% of the total area of the Amundsen Sea. The sea ice persistence (ICE), total phytoplankton (PHYC), and the minimum value of dissolved iron (Fe_min) are the three dominant contributors to the model. Results from the response curves show that Antarctic krill preferred habitats with ICE of 0.42–0.93, PHYC of 2.48–2.77 mmol/m3 and Fe_min of (7.10×10−5)−(9.45×10−5) mmol/m3. Positive trends existed in the PHYC of the high and moderate suitable habitat, and a positive trend existed in the Fe_min of moderate suitable habitat. However, the probability of presence of Antarctic krill will decrease if the increase of the PHYC and Fe_min continues.

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Data Availability Statement

The presence data of the Antarctic krill can be obtained from KRILLBASE (https://www.bas.ac.uk/project/krillbase/). Environmental variables are derived from the GLORYS2v4 (http://marine.copernicus.eu/service-portfolio/).

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Authors and Affiliations

  1. Key Laboratory of Marine Resource Chemistry and Food Technology (TUST), Ministry of Education, Tianjin University of Science and Technology, Tianjin, 300457, China

    Jianlong Feng, Lulu Liu & Liang Zhao

  2. National Marine Data & Information Service, Tianjin, 300457, China

    Qiulin Liu

  3. College of Marine and Environmental Science, Tianjin University of Science and Technology, Tianjin, 300457, China

    Lulu Liu

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Correspondence to Liang Zhao.

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Supported by the Impact and Response of Antarctic Seas to Climate Change from Polar Research Institute of China (No. RFSOCC2020-2022-No.18), the National Science Foundation of Tianjin (No. 19JCZDJC40600), and the National Natural Science Foundation of China (No. 42176198)

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Feng, J., Liu, L., Liu, Q. et al. The potential distribution of adult Antarctic krill in the Amundsen Sea. J. Ocean. Limnol. 40, 1566–1577 (2022). https://doi.org/10.1007/s00343-021-1181-z

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