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- Material Type
- 文書・図像類
- Author/Editor
- 茂木, 正人Moteki, Masato
- Author Heading
- Publication Date
- 2013-11-14
- Publication Date (W3CDTF)
- 2013-11-14
- Alternative Title
- 南大洋インド洋セクターにおけるナンキョクオキアミに依存しない生態系に関する総合的研究
- Text Language Code
- eng
- Target Audience
- 一般
- Note (General)
- Ecosystem studies in the Southern Ocean have been intensively conducted in the Atlantic sector, where Antarctic krill (Euphausia superba) is a key species owing to its large biomass and geographically broad range. However, recent studies have indicated that an alternative energy pathway, a krill-independent food web, dominates in years and regions with lower abundances of krill in the Scotia Sea (Atlantic sector) (Murphy et al. 2007). In the Indian sector of the Southern Ocean, the geographical distribution of krill is limited to along the continental slope, and krill biomass is lower than that in the Atlantic sector. Thus, the krill-independent food-web is expected to be more important in the Indian sector. However, marine ecosystem studies in this region are still under development, and most research has focused on epipelagic waters. Therefore, the mesoand bathypelagic ecosystem of the Southern Ocean remains an unknown realm. In recent years, Japanese marine scientists have achieved progress in various scientific fields within the Southern Ocean, although only a few integrative science programmes have been undertaken in Japan. The scientific programme presented here aims to achieve a comprehensive understanding of the ecosystem in the Indian sector by combining results from individual disciplines that focus on physical and chemical processes, primary production, zooplankton, fish, and top predators. To accomplish this goal, we propose to investigate the following research topics:1) Ecosystems under the sea ice and in the vicinity of the ice edge (including applications of acoustic techniques [see point 6 below]).2) Epi- to bathypelagic ecosystems (including applications of acoustic techniques).3) Early life history and survival strategies of larval myctophid fishes.4) Biology of juvenile and adult myctophid fishes (monitoring abundance, biomass, food habits, and body size frequency as well as reproductive biology under the sea ice and in the vicinity of the ice edge).5) Monitoring of the distribution, migration, food habits, and nutrition conditions of top predators (penguins, flying sea birds, and seals).6) Development and establishment of the most recent acoustic techniques (which can be applied to the above ecosystem studies).7) Interactions between marine physics (sea-ice dynamics) and biological processes.Synthetic analyses of these results will allow the evaluation and prediction of how imminent long-term changes in physical and sea-ice dynamics will affect ecosystems in the Indian sector of the Southern Ocean.第4回極域科学シンポジウム特別セッション：[S] 南極研究の将来展望―第Ⅸ期6か年計画策定に向けて11月14日（木） 国立極地研究所 ２階大会議室