Zooplankton monitoring using a twin NORPAC net during the 63rd Japanese Antarctic Research Expedition in austral summer 2021–2022

• Format: Article in Journal/Newspaper
• Language: English
• Published: National Institute of Polar Research 2024
• Subjects: Zooplankton; monitoring; NORPAC; Southern Ocean; Antarc*; Antarctic
• Online Access: http://id.nii.ac.jp/1434/00000054/; https://pdr.repo.nii.ac.jp/?action=repository_uri&item_id=70; https://pdr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=70&item_no=1&attribute_id=22&file_no=1; https://pdr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=70&item_no=1&attribute_id=22&file_no=2; https://pdr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=70&item_no=1&attribute_id=22&file_no=3

As a part of the monitoring programs of the Japanese Antarctic Research Expedition (JARE), zooplankton sampling using a NORPAC (NORth PACific) standard net has been routinely carried out since JARE-14 (1972/73 season) to estimate the long-term trends of abundance, species composition and their temporal/spatial variation in the uppermost 150 m of the Indian Ocean sector of the Southern Ocean. The icebreaker Shirase has a fixed schedule and route, traveling down longitude 110ºE each December. Data collected on fixed schedules seems to be ideal for long-term monitoring work, and can be used as time series and/or seasonal analysis. This report provides the latest zooplankton data collected during the Shirase cruise in the 2021/22 seasons, and is the fifth report for the zooplankton monitoring on board Shirase since the first report of the 2016/17 season in this journal.