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.
A Sat, study studied this question.