权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Effect of meso-scale oceanographic features on the larval growth and survival of small pelagic fishes in the Kuroshio-Oyashio transitional regions.

中尺度海洋学特征对黑潮-亲潮过渡区小型中上层鱼类幼体生长和生存的影响。

基本信息

批准号：
09460085
负责人：
NAKATA Hideaki
金额：
$ 5.63万
依托单位：
Ocean Research Institute, The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

In this study, we aimed to explore how and to what extent meso-scale oceanographic features affect larval growth and survival of small pelagic fishes such as anchovy in the Kuroshio and Kuroshio-Oyashio transitional regions, where major spawning and nursery habitats were located. For this purpose, focusing on the meso-scale eddies caused by frontal disturbances of the Kuroshio and Kuroshio Extension, we made intensive field surveys in addition to detailed analyses of existing data. Numerical bio-physical models for evaluating the effect of meso-scale eddies on the biological production in relation to larval growth/survival were also developed.It has been revealed that warm water regions associated with the northward expansion of the Kuroshio water as seen in the northern edge of the Kuroshio front apparently play an important role in biological production and larval growth/survival of anchovy and other small pelagic fishes. In particular, meso-scale eddies caused by frontal disturbances in these regions contribute greatly to the enhancement of larval food production in addition to entraining and accumulating small-sized larvae into the edge of the eddies. On the other hand, larval growth is appreciably low in less productive Kuroshio water to the south and cold water associated with Oyashio water to the north. Therefore, possibility of the encounter of larvae with meso-scale eddies could determine the extent of larval survival in the offshore water.

在这项研究中，我们的目的是探讨如何以及在何种程度上中尺度海洋学特征影响的黑潮和黑潮-俄亥俄州的过渡区，主要产卵和育苗栖息地的小型中上层鱼类，如鱼的幼虫生长和生存。为此，我们在详细分析现有资料的基础上，对黑潮及其延伸体锋面扰动引起的中尺度涡旋进行了深入的实地考察。数值模拟结果表明，黑潮锋北方边缘的暖水区对黑鲷和其它小型中上层鱼类的生物生产和幼体生长/存活起着重要作用。特别是，中尺度涡引起的锋面扰动在这些地区的贡献很大，除了夹带和积累小尺寸的幼虫到边缘的漩涡的幼虫的食物生产的增强。另一方面，在生产力较低的黑潮水南部和冷水与Oyashio水北部的幼虫生长明显较低。因此，幼虫与中尺度涡旋相遇的可能性可以决定幼虫在近海水域中的存活程度。