摘要
Field observations were conducted to examine the processes governing the phytoplankton distribution and photosynthetic activity in and around a tidal front formed in Iyo Nada, the Seto Inland Sea, Japan. The existence of a middle layer intrusion, which, it has been suggested, moves from the mixed region to the stratified region of the tidal front, was ascertained by the phytoplankton distribution in addition to a T-S diagram. Skeletonema costatum, which originally inhabited the mixed region, was used as the indicator to reveal the intrusion. However, the tip of water containing the S. costatum population did not extend deeply into the stratified region. The velocity of the intrusion seemed to be slow enough to make biological processes, such as nutrient uptake by phytoplankton and subsequent growth, as well as the decrease in cell density due to zooplankton grazing, dominate during the transportation. The patchy distribution of copepod nauplii implied that grazing has an influence on the distribution pattern of phytoplankton. The location of high photosynthetic activity did not coincide spatially with the center of high phytoplankton biomass, suggesting the importance of these biological processes. Therefore, it is considered that the middle layer intrusion plays a role as an inducer of subsequent biological processes at the tidal front by not only supplying nutrients from the mixed region but also by increasing the vertical diffusivity.
摘要译文
实地观察进行了检查治理浮游植物分布和光合活性和周围潮汐前形成的伊予滩，濑户内海的过程，日本。的中间层的入侵，其中，已经建议的存在，从混合区域移动到潮汐前面的分层区域，被确定，除了的TS图浮游植物分布。中肋骨条藻，原本居住的混合区域，被用作指示器以显示侵入。然而，含有中肋骨条藻人口水的前端没有深深伸入分层区域。入侵的速度似乎是足够慢以使生物过程，如养分摄取浮游植物和随后的生长，以及在由于浮游动物放牧细胞密度的降低，在运输过程中占主导地位。桡足类无节幼体的片状分布暗示放牧对浮游植物的分布格局产生影响。高光合活性的位置并没有在空间上具有高浮游植物生物质的中心一致，暗示这些生物过程的重要性。因此，Ë层侵入发挥作用作为后续的生物过程的诱导潮前通过不仅从混合区域提供营养，而且通过增加垂直扩散。
Tamiji Yamamoto [1] Toshiya Hashimoto [2] Hidetaka Takeoka [3] Tenji Sugiyama [2] Osamu Matsuda [2]. Middle Layer Intrusion as an Important Factor Supporting Phytoplankton Productivity at a Tidal Front in Iyo Nada, the Seto Inland Sea, Japan[J]. Journal of Oceanography, 2000,56(2): 131-139