Sub-Arcrtic Gyre Ecosystems and Its Response to Climate Change -East-West Comparative Study in the North Pacific

本研究的目的是（1）阐明几个从低营养级到高营养级的种群对物理和生物环境变化的响应，特别是我们重点关注了白令海的关键香料鱼、狭鳕和阿拉斯加湾的鲑鱼、鲳鱼和飞鱿鱼，（2）考虑到HNLC地区铁的限制，利用in-plasma分析了西亚北极环流和阿拉斯加环流初级生产系统的差异。现场和卫星观测。此外，我们尝试开发新的观测和采样方法，调查鱼类种群和鱼类的空间分布，利用海洋遥感和水下遥感。在本研究期间，我们进行了三个现场观测航次T/S Oshoro-Maru在2002年，2003年和2004年夏季。在2003年和2004年，我们有两个样带调查沿沿着165东长。165西长来比较东西向的环流系统。2003年夏天，我们有幸在美国檀香山的夏威夷举办了"白令海和北太平洋海洋生态学研究-UH-HU学术交流协议纪念研讨会和2003年T/S Oshoro Maru号巡航"小型研讨会，然后介绍了我们的初步成果，并进行了富有成效的讨论。

Objectives of this study are (1) to clarify a response of several populations from lower to higher trophic levels to physical and biological environment change, especially we focused on the key spices, walleye pollock in the Bering Sea, and salmon, pomfret and flying squid in the Gulf of Alaska, and (2) to examine difference of primary production systems in both Western Sub-Arctic gyre and Alaskan Gyre in consideration of iron limitation in HNLC regions using in-situ and satellite observations. Moreover, we tried to develop new observation and sampling methods for surveying fish populations and spatial distribution of fish using ROV and underwater remote sensing.In this study period, we carried out three in-situ observation cruises by T/S Oshoro-Maru in summer 2002, 2003 and 2004. In 2003 and 2004, we had two transects survey along 165 East long. and 165 West long. in order to compare east-west gyre systems. In summer 2003, we had a chance to hold the mini-symposium of "Marine Ecological Studies in the Bering Sea and the North Pacific-Commemorative symposium for UH-HU academic exchange agreement and to mark the 2003 cruise of the T/S Oshoro Maru" in University of Hawaii, Honolulu, U.S.A., then presented our preliminary results and had a fruitful discussions.