Japan Geoscience Union Meeting 2019

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[J] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS14] Global climate change driven by the Southern Ocean and the Antarctic Ice Sheet

Mon. May 27, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Osamu Seki(Institute of Low Temperature Science, Hokkaido University), Akira Oka(Atmosphere and Ocean Research Institute, The University of Tokyo), Ryu Uemura(University of the Ryukyus), Ryosuke Makabe(National Institute of Polar Research)

[MIS14-P05] Feeding habit of the Antarctic amphipod Themisto gaudichaudiiof Vincennes Bay (East Antarctica) during austral summer

*Junji Matsushita1, Ryosuke Makabe2, Masato Moteki1 (1.Tokyo University of Marine Science and Technology, 2.National Institute of Polar Research)

Keywords:The Southern Ocean, Macrozooplankton, Amphipod

Amphipods are key components of macrozooplankton to link lower trophic levels to higher predators in the krill-independent food web in the Southern Ocean (SO). The carnivorous amphipod Themisto gaudichaudii, widely distributed in SO, is an opportunistic predator. They are known to feed on copepods, euphausiids, salps and various zooplankton in the Atlantic Ocean sector, while their food habits are poorly known in the Indian Ocean sector. This study analyzed gut contents of T. gaudichaudii collected along the 110°E transect in SO in January 2019 to clarify food habit of T. gaudichaudii. Fecal pellet obtained from onboard experiment were supplementary used to verify the estimated food habit. We’ll preliminary demonstrate here the food web related to T. gaudichaudii in the Indian Ocean sector during austral summer.