Zooplankton monitoring using a twin NORPAC net during the 59th Japanese Antarctic Research Expedition in austral summer 2017–2018

• Format: Article in Journal/Newspaper
• Language: English
• Published: National Institute of Polar Research 2020
• Subjects: Zooplankton monitoring; NORPAC net; Southern Ocean; Antarc*; Antarctic
• Online Access: http://id.nii.ac.jp/1434/00000014/; https://pdr.repo.nii.ac.jp/?action=repository_uri&item_id=27; https://pdr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=27&item_no=1&attribute_id=22&file_no=1; https://pdr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=27&item_no=1&attribute_id=22&file_no=2; https://pdr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=27&item_no=1&attribute_id=22&file_no=3

As part of the monitoring program 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. Two separate monitoring surveys were completed during JARE-59 (December 2017 to March 2018). The icebreaker Shirase has a fixed schedule and route, traveling down longitude 110oE each December and returning along 150oE each March. Data collected on these fixed schedule seems to be ideal for long-term monitoring work in this region. We present data from its 2017/2018 voyage. In additions, separate samplings were carried out on board the T/V Umitaka-maru along 110oE longitude in January 2018. This report provides the latest zooplankton data. These transect data can be used as time series and/or seasonal sets over the last 45 years.