STUDY ON THE HABITAT OF DEIRATONOTUS JAPONICUS AND AQUATIC ENVIRONMENT IN THE KITA RIVER, JAPAN
STUDY ON THE HABITAT OF DEIRATONOTUS JAPONICUS AND AQUATIC ENVIRONMENT IN THE KITA RIVER, JAPAN
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日本北川白鲳栖息地及水环境研究
DOI：
10.2965/jwet.2003.49
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发表时间：
2003
影响因子：
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通讯作者：
M. Hirata
中科院分区：
文献类型：
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作者：
H. Yamanishi;T. Kusuda;Seungyoon Lee;A. Hara;M. Hirata
海水由于潮汐的作用在潮汐河中上下流动。感潮河流混合较弱时，会形成盐水楔，本研究的对象场日本九州岛东部的北河就处于这种状态。当外力作用于生态系统时，可能会发生变化。由于潮差水域生态脆弱，生产力高，对生态系统的影响更大。本研究试图通过对世界珍稀物种白颈长尾雉（Deiratonotus）在盐水楔运动中的行为进行研究，获得水质与水力因子之间的关系，探讨白颈长尾雉栖息地的适宜环境条件。野外观察表明，背甲鲶的栖息地在潮差区的纵向分布与盐度、水温相关，在断面分布与河床物质、水面高程相关。
Salt water from the sea flows up- and down-ward in tidal rivers due to tides. When mixing in a tidal river is relatively weak, a saltwater wedge is formed in it. The Kita river, the objective field in this study, located in eastern part of Kyushu island in Japan is in this state. When external forces work on an ecosystem, then changes might occur in response to them. The ecosystem in such a river is with more impact, because its aquatic zone in the tidal range is fragile and high in productivity. This study attempts to investigate the behavior of Deiratonotus japonicus, known as a rare species in the world, in association with saltwater wedge movement, to obtain relationships between water quality and hydraulic factors and to study the preferable environmental condition on the habitat of Deiratonotus japonicus. Based on field observations, the habitat of Deiratonotus japonicus has a distribution correlated to salinity and water temperature in the longitudinal direction, and riverbed materials and water surface elevation in the cross-section in the tidal range.