Chaetognath species-specific responses to climate regime shifts in the Tsushima Warm Current of the Japan Sea

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概要

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• Expanding the work in our previous paper (Nagai et al. 2006), which showed the close linkage of chaetognath species to changes in water temperature and reported their occurrence characteristics, chaetognath species-specific responses to climate forcing via water temperature fluctuations were ascertained by studying inter-annual linkages among climate-ocean-ecosystem elements. Using samples collected between 1972 and 2002 in the Japan Sea, an attempt was made to understand how the three dominant chaetognaths—Sagitta minima, S. nagae and S. enflata—respond to inter-annual variations of atmospheric signals and oceanic effects in the Tsushima Warm Current around climate regime shift years. Among ocean-atmosphere parameters, the winter monsoon was the most crucial for driving the ecosystem of the Japan Sea. No significant correlation with any of the other parameters was found with the southern oscillation index, but the winter monsoon index had a correlation with water temperature. The climate regime shift during 1976/77 occurred with anomalously cold water induced by a strong winter monsoon. The next climate regime shift (1988/89) appeared with a warm water anomaly due to retention of warm water formed in winter by a weak winter monsoon and increased transport volume in the Tsushima Warm Current water. Chaetognath abundance and species numbers decreased during the colder regime and increased during the warmer regime. Responding to temperature in a species-specific manner, chaetognaths varied notably in abundance. Consequently, changes in species numbers and switching of dominant species occurred. Thus, chaetognath species could be a significant indicator of climate events that influence the ecosystem in the Japan Sea.

• 日本プランクトン学会、日本ベントス学会の論文
• 2008-05-01

著者

• Sugimoto Takashige

  Institute Of Geology And Geoinformation National Institute Of Advanced Industrial Science And Techno

• Nagai Naoki

  Maizuru Marine Observatory

• Tadokoro Kazuaki

  Tohoku National Fisheries Research Institute

• KURODA KAZUNORI

  formerly Japan Sea National Fisheries Research Institute

• Sugimoto Takashige

  Institute Of Oceanic Research And Development Tokai University

関連論文

• Effect of horizontal advection induced by intrusion of the Kuroshio water on plankton biomass in the spring fishing period of shirasu on the Pacific coast of Japan
• Introduction : Processes and Dynamics in the Northwestern Pacific Ecosystems (from China-Japan-Korea Joint GLOBEC Symposium, 13-15 December 2002 at Ansan, Korea)
• Jellyfish Patch Formation Investigated by Aerial Photography and Drifter Experiment
• Sedimentary Records of Multidecadal-Scale Variability of Diatom Productivity in the Bungo Channel, Japan, Associated with the Pacific Decadal Oscillation
• Possibility of Recent Changes in Vertical Distribution and Size Composition of Chlorophyll-a in the Western North Pacific Region
• Chaetognath species-specific responses to climate regime shifts in the Tsushima Warm Current of the Japan Sea
• Occurrence Characteristics of Chaetognath Species along the PM Transect in the Japan Sea during 1972-2002

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