Variation of Ichthyoplankton Density Across the Kuroshio Edge Exchange Area with Implications as to the Water Masses

以穿越黑潮邊緣交換區的浮游魚類密度變動暗示不同的水團來源

丘臺生(Tai-Sheng Chiu)

《Terrestrial, Atmospheric and Oceanic Sciences》 2卷2期 (1991/06) Pp. 147-162

摘要

台灣東北海域特性，可被稱爲黑潮交換區。我們使用海研一號以錐形浮游魚類採集網採集浮游魚類，其目地在於瞭解浮游魚類的群社結構及其與黑潮邊緣交換過程的關系。這個初期報告分析了魚卵、浮游魚類及同時捕獲浮游動物的空間密度分佈；再以生物的密度及水文資料同時攷慮以暗示水團的來源。
主要的結果是：1)浮游魚類的密度分佈顯示，a)西北方指向東海陸棚的密度最高，b)黑潮本體部較低，c)其間在較接近岸邊的測站爲中等密度；2)以生物密度及水文因數所進行的主成分分析，可以清晰地劃分中陸棚水團及外洋水團。

並列摘要

Ichthyoplankton in a water column off north-eastern Taiwan, an area referred to as the Kuroshio edge exchange area, was sampled using a conical ichthyoplankton net on board R/V Ocean Research I. The purpose of this survey was to understand the ichthyoplankton community structure and its linkage with the Kuroshio edge exchange process. This preliminary analysis illustrates the spatial density distribution of fish eggs, ichthyoplankton and an incidental catch of zooplankton. Biological densities and their linkage with the hydrological variables were also analyzed.
The principle findings include: 1) that the distribution of ichthyoplankton densities exhibited a consensus pattern of high density in a northwesterly direction near the East China Sea, low density in the southern area of the Kuroshio current proper and moderately high densities in the shore area and 2) that principal component analysis based on hydrological and biological variables produces a clear picture that discriminates between the water mass of mid-shelf origin and those of oceanic origin. Station specific variation of the hydrological variables is also discussed.