Zooplankton monitoring using a twin NORPAC net during the 58th Japanese Antarctic Research Expedition in austral summer 2016–2017

• Format: Article in Journal/Newspaper
• Language: English
• Published: National Institute of Polar Research 2019
• Subjects: Zooplankton monitoring; NORPAC net; JARE; Antarctic; Austral; Indian; Pacific; Southern Ocean; Antarc*
• Online Access: http://id.nii.ac.jp/1434/00000007/; https://pdr.repo.nii.ac.jp/?action=repository_uri&item_id=13; https://pdr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=13&item_no=1&attribute_id=22&file_no=1; https://pdr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=13&item_no=1&attribute_id=22&file_no=2; https://pdr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=13&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-58 (December 2016 to March 2017). The icebreaker Shirase has a fixed schedule and route, travel down longitude 110ºE each December and return along 150ºE each March, making its voyages ideal for long-term monitoring work in this region. We present data from its 2016/2017 voyage. In additions, a transects by the T/V Umitaka-maru was also carried out along 110ºE longitude in January 2017. Thus, this report provides the latest zooplankton data, forming part of the long-term monitoring of zooplankton carried out by JARE in this region for the last 40 years. These transect data can be used as time series and/or seasonal sets.